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HCD-481 : Adding reconnection logic added for HDFS2 sink connector #531

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HCD-481 : Adding reconnection logic added for HDFS2 sink connector #531

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61b3b57
Adding support for reconnection logic
sagar-ab-2702 Nov 27, 2020
3bc06c7
logging exception
SanchayGupta1197 Dec 14, 2020
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10 changes: 10 additions & 0 deletions src/main/java/io/confluent/connect/hdfs/avro/AvroRecordWriterProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,8 @@
import io.confluent.connect.hdfs.storage.HdfsStorage;
import io.confluent.connect.storage.format.RecordWriter;
import java.io.OutputStream;

import org.apache.avro.AvroRuntimeException;
import org.apache.avro.file.CodecFactory;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.generic.GenericDatumWriter;
Expand Down Expand Up @@ -84,6 +86,14 @@ public void write(SinkRecord record) {
}
} catch (IOException e) {
throw new DataException(e);
} catch (AvroRuntimeException ex) {
// Making schema null to invalidate file corrupted due to connection failure
schema = null;
/*
Wrapped into ConnectException so that setRetryTimeout() is called in the
TopicPartitionWriter class to retry the records.
*/
throw new ConnectException(ex);
}
}

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22 changes: 22 additions & 0 deletions src/main/java/io/confluent/connect/hdfs/orc/OrcRecordWriterProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,15 @@
import io.confluent.connect.storage.format.RecordWriter;
import io.confluent.connect.storage.format.RecordWriterProvider;
import io.confluent.connect.storage.hive.HiveSchemaConverter;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
import org.apache.hadoop.hive.ql.io.orc.OrcFile;
import org.apache.hadoop.hive.ql.io.orc.OrcStruct;
import org.apache.hadoop.hive.ql.io.orc.Writer;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.Struct;
import org.apache.kafka.connect.errors.ConnectException;
Expand All @@ -33,6 +36,7 @@
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.URI;

public class OrcRecordWriterProvider implements RecordWriterProvider<HdfsSinkConnectorConfig> {

Expand Down Expand Up @@ -99,6 +103,24 @@ public void preFooterWrite(OrcFile.WriterContext writerContext) {
);
}
} catch (IOException e) {
if (e instanceof RemoteException || e instanceof AlreadyBeingCreatedException) {
try {
/*
The current version of OrcFile.WriterOptions does not supports file overwriting
therefore deleting tmp file whenever`AlreadyBeingCreatedException` is thrown.
*/
FileSystem fileSystem = FileSystem.get(
URI.create(conf.getUrl()),
conf.getHadoopConfiguration()
);
fileSystem.delete(path, true);
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Not too familiar with HDFS. Why are we deleting the file for ORC here? Why is schema=null not enough like with AVRO

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The current version of org.apache.hadoop.hive.ql.io.orc.OrcFile.WriterOptions does not supports file overwriting therefore deleting tmp file wheneverAlreadyBeingCreatedException is thrown.

} catch (IOException ex) {
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Can we log this error message as well?

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Have added the exception to the log below.

// connection refused to the HDFS cluster.
log.debug("Connection failed while deleting the tmp file from the HDFS cluster.");
}
}
// Making schema null to invalidate corrupted file due to connection failure
schema = null;
throw new ConnectException("Failed to write record: ", e);
}
}
Expand Down