Buddy created HDFS-5868:
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Summary: Make hsync implementation pluggable
Key: HDFS-5868
URL: https://issues.apache.org/jira/browse/HDFS-5868
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Affects Versions: 2.4.0
Reporter: Buddy
The current implementation of hsync in BlockReceiver only works if the output
streams are instances of FileOutputStream. Therefore, there is currently no way
for a FSDatasetSpi plugin to implement hsync if it is not using standard OS
files.
One possible solution is to push the implementation of hsync into the
ReplicaOutputStreams class. This class is constructed by the ReplicaInPipeline
which is constructed by the FSDatasetSpi plugin, therefore it can be extended.
Instead of directly calling sync on the output stream, BlockReceiver would call
ReplicaOutputStream.sync. The default implementation of sync in
ReplicaOutputStream would be the same as the current implementation in
BlockReceiver.
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