CHANGES.txt

For Release Notes, see http://neo4j.org/release-notes#neo4j-2.0.0-M01

2.0.M01
-------
o Added support for labels across all APIs: Cypher, Core Java and REST
o Added support for the new label-based indexes across all APIs: Cypher, Core Java and REST
o Improvements to shell, including import/export of small graphs via cypher statements

1.9.M05 (2013-03-05)
--------------------

Now compiles and runs under JDK 7

Kernel:
o Concurrent modifications to relationship chains now do now lead to RecordNotInUse exceptions or
  cache poisoning
o Proper tx management will now make negative transaction counts impossible
o IndexProvider is now deprecated, replaced by KernelExtensionFactory
o Store locks are respected from read only instances too
o grab_file_lock configuration setting is now deprecated

Lucene Index:
o LuceneIndexProvider is now replaced by LuceneKernelExtension

Server:
o Added support for X-Forwarded-Host and X-Forwarded-Proto headers to allow parameterising of 
  links in data for hosting behind proxy servers.

JMX:
o JMX will now provide info on all configuration values, including the defaults not explicitly set

Cypher:
o Fixes #450 - Predicates in WHERE are not evaluated correctly for certain patterns
o Fixes problem with null comparisons and optional relationships
o Made it possible to run the parser concurrently
o DISTINCT is now lazy, and keeps the incoming ordering
o Added execution plan descriptions to execution results
o Fixes #464 - getDeletedRelationships does not work for javacompat.ExecutionResult
o Fixes #535 - 'INTERNAL_SORT' columns show when doing RETURN * ORDER BY
o Added experimental profiled query support
o Fixes #489 - CREATE UNIQUE does not work as expected inside FOREACH

1.9.M04 (2013-01-17)
--------------------
Kernel:
o Start entries are now explicitly marked as written, solves a bug that might cause recovery to fail

Server:
o Increased performance for rest-batch-operations by a factor of 100

Cypher:
o Clearer error message for when aggregations are used in ORDER BY and not in RETURN
o Fixes #394 - Identifiers inside of FOREACH get the wrong type
o Fixes #390 - IN/ANY/NONE/ANY/SINGLE causes RuntimeException for some patterns
o Fixes #387 - Some patterns produced "Unexpected traversal state" in Cypher
o Upgraded the Scala version to 2.10
o Fixes #355 - Collections in collections are still Scala collections instead of Java collections

1.9.M03 (2012-12-21)
--------------------
Server:
o Pulled out Gremlin as separate plugin to support different versions

Cypher:
o Fixes #336 - Patterns that re-use a pattern node can produce non-existing matches
o Fixes #369 - The substring-function sometimes fails when no length is specified

1.9.M02 (2012-11-30)
--------------------
Kernel:
o Made sure that auto-indexing removed graph elements from indexes when they are delete
o OrderByTypeExpander keeps ordering of type AND direction
o Fixed an issue where a lock on a store was sometimes not released
o Old GraphDatabaseSetting classes are now wrappers for Settings instances
o Fixes an issue where an incomplete 2PC transaction could cause recovery to not be triggered
o Optimizations for read performance
  - Cache refers to relationship types as ints instead of Strings.
  - Binary search on sorted arrays for finding properties and
    relationship types in the cache.
  - Less objects instantiated during getting and iterating relationships.
  - Reduced number of map lookups significantly for a getProperty call,
    especially outside transaction or in transactions without any changes.
    (previously 8 lookups whereof 2 synchronized, now down to as low as 2)
  - Uses ThreadLocal as mapper from thread to transaction
  - Refactored LockReleaser into TransactionState, associated with each
    transaction instead

Server:
o Server now allows - under some specific circumstances - setting empty arrays as properties. 
  Specifically, it is allowed if there is a pre-existing array property on the entity from 
  which the server can infer the type of array to store.
o Traversal Javascript is now security sandboxed. It is possible to turn the sandbox off for
  the next two releases, for backwards compatibility.

Cypher:
o The traversal pattern matcher now supports variable length relationship patterns
o Fixes #946 - HAS(...) fails with ThisShouldNotHappenException for some patterns
o Made Cypher better at keeping a numeric type. Adding two integers now returns an integer, and not a double.
o Major refactoring to make certain Cypher is more lazy
o When asking for the top x rows by some value, Cypher will now only keep a list the size of x
o Fix so identifiers created inside a foreach can be used by other statements in the foreach
o Fix for problems when using patterns with multiple unnamed nodes
o Fixes problems when doing ORDER BY ... LIMIT x. When x is larger than the input set, sorting was never done.

1.9.M01 (2012-10-23)
--------------------
Kernel:
o XaDatasources now implement lifecycle and their registration with XaDatasourceManager triggers TxManager recovery
  on startup.
o Neo4j logical log now handles running out of disk space at a critical point gracefully.
o Kernel extensions are now factories that create instances which participate in the database's lifecycle
o Fixes a race condition around relationship chain loading from multiple threads on the same node

Cypher:
o Predicates can now be returned and used to set properties
o Fixes #797: CREATE UNIQUE now makes sure used identifiers have the same properties even if
  they are re-used without the properties
o Added the traversal matcher, which uses the new traversal framework abilities to do
  pattern matching. It should provide for nice performance benefits for a lot of queries.
o Fixed #866: Changed the LRU cache to make it safe to use concurrently, and made the parser single threaded
o Added the reduce() functionality
o Made addition automatically convert numbers to strings when adding the two together
o Added the string functions: str(), replace(), substring(), left(), right(), ltrim(), rtrim(), trim(), lower(), upper()
o Added the possibility to use ORDER BY, SKIP and LIMIT together with WITH
o Fixes #904: CREATE UNIQUE doesn't work with parameter maps
o Fixes #908: Parameters do not survive WITH if it has aggregation
o SET can now be used to set properties on nodes and relationships from maps or other graph elements

1.8.RC1 (2012-09-05)
--------------------
Kernel:
 o Removed contention around allocating and moving persistence windows so that a thread won't need to await
   another thread doing this refresh, instead just continue knowing that the windows will be optimally
   placed in a very near future.
 o Removed contention around translating a key (as String) into the ID by using copy-on-write map instead
   of a concurrent hash map. Used in property key as well as relationship type translation.
 o Fix for Node/Relationship#getPropertyValues() sometimes returning null values from the iterator.

Server:
 o Upgraded Jackson JAXRS to version 1.9.7 
 o Keeping the Cypher execution engine between calls makes it possible to re-use execution plans
 o added User-Agent header tracking to udc to determine rest-driver usage

Cypher:
 o Removed the /../ literal for regular expressions. Now a normal string literal is used instead
 o Concatenation handles types better
 o Changed how the graph-matching module is used, to make it safe for concurrent use
 o Better type error messages
 o Renamed iterable to collection
 o Fixed #795: so that WITH keeps parameters also for empty aggregation results
 o Fixed #772: Creating nodes/relationships goes before SET, so SET can run on already created elements
 o Added error when using != instead of <>
 o Fixed #787: Issue when comparing array properties with literal collections
 o Fixed #751: Better error message for some type errors
 o Fixed #818: Problem where properties could only have scalar values (they can be arrays as well)
 o Fixed #834: Gives relevant syntax exception when properties are entered in MATCH

1.8.M07 (2012-08-08)
--------------------
Kernel:
 o Traversal framework backwards compatibility
   + Cleaned up any breaking changes
   + Removed Expander#addFilter
 o Kernel JMX bean instance identifier is now reused and can optionally be set explicitly via forced_kernel_id config setting

Server:
 o Consoles in webadmin can now be disabled.

Cypher:
 o Added escape characters to string literals
 o Renamed `RELATE` to `CREATE UNIQUE`

UDC:
 o Added edition information (community, advanced, enterprise)
 o Added a cluster-name hash so that stores originating from the same cluster can be aggregated
 o Fixed release version and revision
 o Changed precedence of database configuration over internal udc configuration
 o Added distribution information (dpkg, rpm, unknown)

1.8.M06 (2012-07-06)
--------------------
Kernel:
 o Deprecated AbstractGraphDatabase.transactionRunning()
 o Changed synchronization of applying transactions to prevent a deadlock scenario
 o Original cause can be extracted from a transaction RollbackException

Server:
 o Fixed issue that stopped the server from starting without the UDC-jars.

Cypher:
 o Fixes problem when graph elements are deleted multiple times in the same query
 o Fixes #625: Values passed through WITH have the wrong type
 o Fixes #654: Some paths are returned the wrong way

1.8.M05 (2012-06-25)
--------------------
Kernel:
 o Configurable amount of logical logs to keep, by for example number of days or size on disk.
   keep_logical_logs configuration is extended to support values such as: "10 days", "200M size" a.s.o.
   Regardless of configuration there will always be at least the latest non-empty logical log left.
 o Reduced synchronization while memory mapping files, leading to increased multithreaded performance

Server:
 o Added support for multi line Cypher queries in webadmin browser

Lucene-index:
o Removed lucene_writers_cache_size and have lucene_searcher_cache_size decide for both, since
  it's doesn't make sense to have a writer w/o a searcher and isn't possible to have a searcher
  w/o its writer.
o Loosened contention regarding getting index searchers for querying.

Cypher:
 o CREATE and RELATE can now introduce path identifiers
 o String literals can now contain escape characters
 o Fixes #600: Double optional with no matching relationships returns too many rows
 o Fixes #613: Missing dependencies not reported correctly for queries with RELATE/SET/DELETE
 o Fixes around optional paths

1.8.M04 (2012-06-07)
--------------------
Kernel:
 o Additions to the traversal framework:
   + Bidirectional traversals (with BidirectionalTraversalDescription). AllPaths/AllSimplePaths
     uses this feature and are now faster due to less relationships being traversed.
   + Multiple start nodes (as well as multiple end nodes for bidirectional traversals).
   + PathExpander (RelationshipExpander for Paths) which has the full Path passed in instead of
     just the end node of the path. It can also see and modify a user defined traversal branch state.
   + Metadata about the traversal, for the time being: number of relationships traversal and
     number paths returned.
   + Added Path#reverseNodes() and Path#reverseRelationships which gives all nodes/relationships in
    a path in reverse order (starting from the end node going back to the start node). More relevant
  	in many scenarios as well as allowing for a more efficient implementation.
   + Sorting of traversal results, specify with TraversalDescription#sort(Comparable).
   + Some measure to reduce memory consumption and garbage generation during traversals.

Graph-algo:
 o AllPaths/AllSimplePaths uses the new bidirectional traversal feature in the traversal framework.
  Less relationships now needs to be traversed to find the requested paths.
 o Added an implementation of the shortest path algorithm with the bidirectional traversal feature.

Cypher:
 o CREATE now accepts full paths and not only single nodes and relationships
 o Path patterns can now be used as expressions and as predicates
 o Fixes bug where RELATE fails to compare array properties
 o Fixes #573: Arithmetics operations have wrong type
 o Fixes #567: Parameter maps coming through REST are not parsed correctly
 o Fixes #563: COUNT(*) does not return 0 for empty result
 o Fixes #561: RELATE doesn't work as expected with map-parameters

1.8.M03 (2012-05-24)
--------------------
Kernel:
 o Changed array map to CHM in property index manager, better multithreaded performance
Shell:
 o Added BEGIN TRANSACTION/COMMIT/ROLLBACK
 o Sessions now live on the server side instead of on the client, which means that not just
  serializable values can be set there. Paves the way for Cypher making use of it.
Server:
 o keep_logical_logs is now respected if set to false - default is still true
Cypher:
 o Added RELATE
 o Changed the CREATE syntax, so it looks more like RELATE
 o Fixes #506: delete head(rels) doesn't work
 o Fixes #508: length function on array properties doesn't work
 o Fixes #512: start n=node(*) match n-[r?]->() delete n,r not working
 o Fixes #514: Extract doesn't work with array properties
 o Fixes #523: String literals not parsed correctly in CREATE statement
 o Fixes #526: cypher filter in return clause
 o Fixes #536: SQRT only returns an integer
 o Fixes #543: Appending elements to collections
 
1.8.M02 (2012-05-11)
--------------------
Kernel:
 o Optimized short string and short array encoding algorithms
 o Fixed problem with SpringTransactionManager during HA master switch
Shell:
 o Shell can now be exited with Ctrl-D
Server:
 o Support for streaming results for http batch operations.
 o Proper encoding of Index URI key/value pairs.
 o Fixed Swedish character problem in webadmin string properties.
 o Webadmin chart labels have nice formatting now.
Cypher:
 o Added the possibility to create nodes from an iterable of maps

1.8.M01 (2012-04-26)
--------------------
o Byte array properties are handled in a more optimized way, increasing performance by a couple of times at least.
o Fix for an issue where update of cache when creating a relationship on a very dense node would take longer and longer time.
o Fix for an issue where a recovery would sometimes fail with it reporting that a start record already had been injected.
o Added "create" shell app for Cypher queries only doing creations.
Server:
  o Added streaming to REST API. All representation implementations have been adapted to produce their data lazily.
  o Added HTTP logging.
Cypher:
  o Added the possibility to return all graph elements using RETURN *
  o Added CREATE, SET, DELETE, FOREACH, WITH
  o Fixes issue #432, #446

1.7 (2012-04-18)
----------------
o Moved BatchInserter to a different package.
o Fixed 'Record Not In Use' issue with creating and setting Node properties with the BatchInserter.
Cypher:
  o Added the possibility to use multiple relationship types on patterns
  o Fixed bug when aggregation is used in ORDER BY and not listed in the RETURN clause
Server:
  o Added scored index results to REST API
  o Improvements to installation docs for the server
  o Added auto index management API to REST, fixing #399
  o Fixed unicode issues in batch operations API in windows and OS X
  o Server now disallows creating indexes with empty names. Closes #311
  o Attempting to delete a non-existing index now returns 404, closes #349
UDC:
  o Modified UDC to run one thread per DB, and to shut down background thread on unload. Closes #279
  o UDC now sends the machines MAC adress to Neo Technology, to separate between instances behind firewalls
  o UDC now sends database registration ID to Neo Technology, if one is available
  o UDC now sends "tags" to Neo Technology, these contain information about the type of deployment, such as language, web-container, app-container, spring, ejb

1.7.M03 (2012-04-11)
--------------------
o Removed old OSGi support in favor of the new and better one.
o Added possibility to use logback for logging.
o Renamed array cache to GC resistant cache (GCR) and moved it to enterprise.
o Fixed problem with GCR cache that could cause it to calculate incorrect size.
o Fixed problem with closing of messages.log on windows

1.7.M02 (2012-03-26)
--------------------
o Added lock free atomic array cache that avoids triggering full GCs.
o Added GC monitor that will keep track on how much the JVM blocks application threads.
o Fix for an issue where upgrading indices with an unclean shutdown.

1.7.M01 (2012-03-12)
--------------------
o Fixed bug in PropertyStore that during recovery would throw exception if the last record was incomplete.
o Fixes to transaction log start position caching which mitigates a performance issue and fixes a caching issue during rotation.
o Fixed a couple of issue around copying incomplete transaction to new log during a log rotation.
o Fixed a property cache poisoning bug and some stale references leaking.
o Fixed a data race issue between threads removing the same property while the node is evicted from cache.
o Fixed an issue where a property record in the logical log was missing its owner.
o Log messages in messages.log are now printed in UTC time zone so that it's the same across servers.
o Fix for an issue where a full rebuild of an id generator (rebuild_idgenerators_fast=false) could result
  in exception when adding free ids.
o Fix for issue which would close an id generator as clean if a startup failed at the wrong time, which would make
  the id generator diverge from the store it held ids for and possible truncate that store file the next clean shutdown.
Indexing:
  o Added LowerCaseKeywordAnalyzer and a clear test for it which shows how to configure a case-insensitive exact index.
Cypher:
  o Added literal collections and the IN predicate
  o Added HEAD, TAIL, LAST and FILTER
  o Added ! so that missing property can evaluate to false
  o BREAKING CHANGE: To check whether a property exists on a node, use the HAS(...) function
  o Arithmetic & string concatenation
  o An identifier can now be assigned all the nodes/rels in the graph - START a=node(*)
  o Predicates can be specified inside of a pattern relationship description
Server:
  o Fixed a NPE in guarded database for the result of Index#putIfAbsent.
  o Added SSL support in the server.
  o SecurityRule implementations can now use simple wildcards to allow whole sub paths of URIs to be covered by the rule.
  o Added an "order" parameter to index REST queries to control result ordering.
Shell:
  o dbinfo command now able to print simple values as well as arrays and compound values as JSON output.
  o A shell server which isn't remotely avaiable doesn't touch RMI, neither does a client which connects
    to a server within the same JVM. This makes for less RMI garbage when forgetting to call shutdown().
  o Fixes problem with eval command in that it couldn't execute a single-line command, which made it impossible
    to do ./shell -c 'eval ...' from outside
UDC:
  o Added MAC address to pings.


1.6 (2012-01-19)
----------------
o Fixed a ConcurrentModificationException problem in lucene index when rotating logs and listing store files.
o Fixes issues #173, #118, #138, #103
o Minor performance optimization in property handling code.
Cypher:
  o Lots of changes to the parsers error reporting
  o Queries can now be pre-pended with which parser version to use
  o Database configuration can now change which version of the parser to use as default

1.6.M03 (2012-01-12)
--------------------
o Added a different aggregation logic. Makes aggregating on the same columns as sorting much faster
o Made it possible to query on array properties
o Fixed bugs #157,#140,#168,#170 and a bug which prevented a node sent in as a parameter unable to be returned in a result
o Added means of introspecting locks taken by the LockManager.
o Added a diagnostics API.
o Added Index#putIfAbsent which ensures uniquely put key/value pair for an entity.
o Added UniqueFactory which gets or creates entities uniquely using Index#putIfAbsent
o Fixed an issue with upgrading an 1.5.M02 store where a "store version" record wouldn't be added and which caused problems after non-clean shutdown.
o Fixed an issue where sometimes dual start entries for a transaction would be added in the logical log.
o Upgraded to Lucene version 3.5.
o Added request timeout, controlled with org.neo4j.server.webserver.limit.executiontime (disabled by default).
  Request header (max-execution-time) can shorten it if specified.
o Fixed issues #113, #166, #172
o Allow overriding of server base url for when test browser needs to access server via a different hostname from the bind address.
o Exposes get-or-create-uniquely via REST in ex. POST /index/node/<name>?unique {...}
o Added shell command mknode for creating new nodes w/o creating a relationship.

1.6.M02 (2011-12-16)
--------------------
o [server] Webadmin data browser now supports cypher queries
o [server] DEPRECATION: Cypher execution is now part of the core REST API, the cypher plugin is deprecated.
o [server] Updated to gremlin 1.4
o [server] Fixed bug in how auto indexes are represented
o [server] Max request execution time can now be limited
o [server] Hypermedia URLs returned by the server now set their host based on the HTTP host header
o [kernel] Lower memory usage of ImpermanentGraphDatabase.
o [kernel] Abstracted stores that stores id/name pairs into AbstractNameStore/AbstractNameRecord and removed lots of duplicated code.
o [kernel] Fixed a race condition in the property cache which cuold poison the cache.
o [kernel] Fixed an issue where a JVM crash in the wrong place would make the next startup rename the current logical log without
  incrementing the logVersion, making the next log rename fail.
o [kernel] Start records in the logical log aren't written until the transaction starts preparing/committing. This fixes an issue
  with the logical log not being rotated sometimes.
o [kernel] Added AbstractGraphDatabase#tx() which returns a TransactionBuilder possible of configuring the transaction to be "unforced"
  meaning that logical logs won't be forced when committing. Means better performance for small non-critical transactions.
o [kernel] Reduced number of proxy object instantiation and node record loading in general.
o [kernel] Added a wrapping graphdb abstraction, which makes instances survive even if the underlying db restarts.
o [kernel] Detached LogExtractor from XaLogicaLog so that it can be used without having a db running.
o [kernel] Added an API for progress indication. With a default implementation that prints dots (every 0.5%) and percentages (every 10%) to a PrintStream.
o [cypher] Added allShortestPaths
o [cypher] Added COALESCE
o [cypher] Added column aliasing with AS
o [cypher] Variable length relationships can now introduce a rel-iterable
o [cypher] BREAKING CHANGE: Changed the syntax for iterable predicated ALL/NONE/ANY/SINGLE to use WHERE instead of a colon
o [cypher] BREAKING CHANGE: ExecutionResult is now a read-once, forward only iterator. 
o [cypher] Fixed problems with optional graph elements


1.6.M01 (2011-11-24)
--------------------
o ImpermantentGraphDatabase now uses purely in-memory structures for speed during tests. It's done on a FileChannel level
  so that every other aspect of the database is intact, just that the bytes end up in ByteBuffers instead of files.
o Fixed an issue with evaluators not executing correctly for the start node of a traversal.
o Fixed an issue with BufferOverflowException thrown sometimes during extraction of prepared transactions.
o Added graph properties, i.e. properties that belongs to the graph itself as opposed to a specific node or relationship.
  Useful for extensions which would like to store configuration and what not.
o Better multi-line support in shell, as well as case insensitive app names.
o GraphDatabaseService#getAllNodes and #getRelationshipTypes @Deprecated and moved to GlobalGraphOperations class,
  where also #getAllRelationships is implemented.
o Added LRU cache for open indexes so that a limit can be set. Thanks vivekprahlad (github id) for the patch.
o When using ImpermanentGraphDatabase RAMDirectory is used instead of FSDirectory. Useful for speed during testing.
o Added a LowerCaseKeywordAnalyzer to use for having an exact case-insensitive index.
o Cypher console in webadmin is now a Neo4j Shell console with the exact same Cypher support included.
o More documentation and examples.
o Made zero length (a single node) as well as optional paths in Cypher possible
o Cypher Skip, limit and regular expressions can now be parameterized
o Column order in Cypher output is now preserved
o Cypher Distinct and order by can now be used at the same time
o Cypher Execution plans can now be pretty printed
o Solved a bug when using multiple regular expressions in the same query
o Added the extract function in Cypher

1.5 (2011-10-18)
----------------
o More useful logging to messages.log to help investigating problems.
o Fixed some issues with detection of version and the need to migrate a store.
o In webadmin: visualization adds nodes/relationships to the view for each search and search is performed with CTRL+ENTER.
o Added DISTINCT to all aggregate functions in Cypher.

1.5.M02 (2011-10-10)
--------------------
o [STORE FORMAT CHANGE] New layout of the property store(s) which results in roughly a 30% reduction in size on disk as well as fewer I/O read operations for reading properties.
o Significant performance improvements for extracting transactions from logical logs.
o Lots of new Cypher features, f.ex: path functions, parameters, shortest path function.
o Icons in the visualization in webadmin and added a standalone webadmin mode.
o REST batch API has reduced memory overhead and more appropriate response codes in case of failure.
o Adding to index via REST has changed to have the value in the JSON body.
o Added simple security and authorization hooks and configuration in the server.

1.5.M01 (2011-08-31)
--------------------
o Fixed file lock issues on an open database which could cause them to be released, making the database vulnerable.
o Fixed several recovery issues which could leave the logical logs in an inconsistent state after a recovery.
o Fixed some data visibility issue for relationships as well as some issues with committing relationships to NodeImpl.
o Auto indexing follows tightly with each mutating operation, not per transaction commit.
o Tighter integration with the manual in a lot of places.

1.4 (2011-06-27)
----------------
o Fix for numerical values not being indexes properly in fulltext index.
o More shell commands for deleting entities from the graph.

1.4.M04 (2011-06-09)
--------------------
o First iteration of the Cypher Query Language included,
  with a section in the manual.
o Experimental support for batch operations in REST
o The Neo4j Manual now includes some examples, and the
  section on REST has been extended.   

1.4.M01 (2011-04-28)
--------------------
o Server logging has been changed, see the Server Configuration chapter in
  the manual for further information.

1.3 (2011-04-11)
----------------
o Neo4j Community now licensed under GPL
o All known Windows problems in Neo4j fixed.
o rewritten Webadmin interface with graph visualization support
o Short string support in kernel for better
o 256 Billion database primitives
o support for Gremlin 0.9 and related Tinkerpop projects
o Better JMX and monitoring support (Neo4j Advanced)
o New backup solution with support for both incremental and full online backup (Neo4j Enterprise)

1.3.M05 (2011-03-24)
--------------------
o New look and feel of the webadmin
o New visual data browser
o Updated to Gremlin 0.8
o Added docs for server plugin initialization.

1.3.M04 (2011-03-10)
--------------------
o All manpages are included in the manual.
o Some fixes to be more Windows friendly.
o Added Dijkstra to the list of graph algorithms to be used when finding paths.
o Support for advanced index queries through REST.

1.3.M03 (2011-02-24)
--------------------

o Numerous updates to the Webadmin tool to make it more usable and to fix some visual bugs.
o Removal of the properties service, replaced with a discovery service to allow third-party apps to bind to the server at runtime and discover what services are offered and where.
o Changed the configuration file format to make it simpler and less error prone (but it is *not*) backwards compatible with earlier versions.
o Separated out the server plugin API for easier development, making only the only development dependency for server a very thin layer and small jar.

1.3.M02 (2011-02-10)
--------------------

o Gremlin updated to 0.7 and trimmed down to bare bones dependencies.
o Webadmin minor improvements in Console, Data browser and monitoring.
o better REST JSON property support in Arrays.
o server started in High Availability mode.

1.3.M01 (2011-01-27)
--------------------

o Full online backup (no need to copy store files before hand) in HA and general support for requests with unlimited size.
o A couple of bugs fixed in lucene index.
o More memory efficient handling of transaction streams (extracting and applying).
o New 'eval' shell command which lets you execute JavaScript on the database.

- Server
o Ability to start the server in HA mode.
o Excludes the neo4j-index component (not used anyhow) to enable HA mode.

- Examples
o Added an example of an ordered traversal.

1.2 (2010-12-29)
----------------

- New components:
o Neo4j Server, including Web Admin
o Neo4j High Availability
o Neo4j Graph Database Monitoring and Management tools moved to its own component
o Neo4j Index API integrated in the GraphDatabaseService API
o Neo4j Usage Data Collection

- Other changes:
o Additional services (extensions) for the Neo4j kernel are loaded automatically or can be injected in a running instance.
o Improved memory footprint and read performance.
o A weak reference cache is now available for high load low latency workloads.
o The old index API has been deprecated (but still included and have been updated to use Lucene version 3.0.1).
o There is a new index API based on Lucene supporting multiple indexes both for nodes and relationships.
o Path algos can now be performed using the shell.

o All known bugs have been fixed. For more details see the individual milestone releases below.

1.2.M06 (2010-12-21)
--------------------

- Kernel
o Fixed an issues with PruneEvaluators getting invoked with the start node as argument.
  PruneEvaluators was never invoked with the start node before the arrival of Evaluator interface.
o Added logging of recovery completion.
o Added TransactionData#isDeleted(Node) and #isDeleted(Relationship) and also made
  the collection to hold these a HashSet instead of ArrayList. This allows fast
  lookups for asking if a node/relationship is deleted in a transaction.
o More flexible caching (can instantiate an arbitrary Cache object).

- Shell
o Fixed a problem where ShellServerExtension assumed the shell was enabled during shutdown, which could result in NPE.

- Lucene-index
o More flexible caching (can instantiate an arbitrary Cache object).
o Merged the fast-writes branch. Basically it makes committing changes to lucene indexes
  faster and more throughput-friendly for multiple threads. The performance improvement
  for committing lucene transactions shows best for small transactions, but will improve
  all modifying operations to lucene indexes.
o Fixed bug which could close an IndexSearcher before it was supposed to when
  there was exactly one item in the result set, two or more threads did this at
  the same time as there was another thread doing an update... AND the reading
  threads all called IndexHits#getSingle() on the result.

- HA
o When a new master is chosen, slaves throws away the id allocations they got from the previous master. This fixes a problem where occupied ids where reused.
o Enabled (and fixed problem with) thread on master which checks for dead slave connections and rolls back those transactions, so that their locks are released.
  This fixes a problem where an HA cluster would seem to freeze up and become unresponsive to write requests.
o Adding Log4j and Netty license information.
o Also closes the executor containing the connections.
o Changed dependency scopes.
o Shuts down databases after verifying them.

- Server
o Bridge OSGi LogService to server Logger. Bundle log messages and stdout pipe through correctly.
o Refactoring of functional tests to remove static dependencies. Introduced a server builder to deal with it instead.
o Can now add performance-tweaking properties to the database hosted by the server. It uses the same neo4j.properties file as the embedded version, but you need to add a property: 
  org.neo4j.server.db.tuning.properties into the neo4j-server.properties file.
o Webadmin: Removed component titles, added save button to data browser, minor change to data browser layout.
o Webadmin: Minor UI updates, added error message that shows up when server connection is lost.
o Webadmin: Moved charts into tabbed box, minor UI updates.
o Fixed an issue with initialization order of things in the server to make sure that RRD is initialized when it is needed.
o Webadmin: Added proper tab-like styling to chart tabs and scale selectors.
o Fixed bug in RRD memory usage sampler, making rounding happen at end of calculations, instead of in the midst of.
o Webadmin: Made 30minutes the default view in charts.
o Webadmin: Added kernel version to dashboard, fixed bug in chart drawing (was drawing when the charts are not visible under certain conditions).
o Webadmin: Disallow self relationships in UI, and show error message explaining this.
o Can now load 3rd party JAX-RS jars from the classpath.
o Updated static assembly to properly include both webadmin statics and documentation. Documentation now tested and ships properly down to neo4j-standalone.
o Webadmin: Made the current node show up by default when adding new relations in webadmin.
o Webadmin: Dashboard shows charts with tabs, and allows switching between charts.
o Added a basic readme with instructions for building, running, and functional testing.
o Updating the way to create temporary files to solve the functional test problem where lots of files stick around.
o re-implemented REST to expose indexing of nodes and relationships (new index API)
o single path algo works in RestfulGraphDatabase now
o fixed duplicate paths for delete node or relationship from index
o Http DELETE requires the proper mediatype to accept
o All indexes must be created to use them.
o Added the ability extend the REST API with server plugins.
o Added back links to the first page in the HTML format.
o updating to Gremlin 0.6
o Updated the component site documentation with the new index API.

1.2.M05 (2010-12-02)
--------------------

-New components
o neo4j-ha, providing high availability

-Important changes, server
o updated to Jersey 1.4
o integrated index is now supported by the shell
o new Evaluator interface improves the traversal API
o support for index hit scores in neo4j-lucene-index
o index caching support added to BatchInserter


1.2.M04 (2010-11-18)
--------------------

o added a server packaging as part of neo4j
o added more configuration options to neo4j-lucene-index
o generating javadocs for all components automatically to components.neo4j.org/{component-name}
o Added ImpermanentGraphDatabase to aid in testing

1.2.M03 (2010-11-04)
--------------------

o Monitoring/management over JMX was moved to the new neo4j-management component.
o Added ability to get the name and configuration of existing integrated indexes.

1.2.M02 (2010-10-21)
--------------------

-New components
o Lucene index, an implementation of the integrated index framework
  using lucene as backend. Planned to replace current index service.

-Important changes
o Fixed shutdown issue regarding UDC leaving a thread running.
o A new index framework integrated into the kernel API.
o Getting relationships is faster due to less cache lookups.

1.2.M01 (2010-10-08)
--------------------

-New components
o Udc

-Important changes
o Index:
   - Lucene version upgraded to 3.0.1
o Shell:
   - Apps discoverable with service locator
   - Added read-only mode on server
   - 'host' and 'config' options
o Graph-algo:
   - Find paths of certain length
o Kernel:
   - Lower memory footprint
   - Higher throughput/concurrency for reads
   - Common interface for loading kernel extensions (f.ex. shell)

1.1 (2010-07-29)
----------------

-New components
o Graph-algo
o Online-backup

1.0 (2010-02-16)
----------------

-Initial components
o Kernel
o Index
o Remote-graphdb
o Shell