Vinayakumar B created HDFS-11674:
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Summary: reserveSpaceForReplicas is not released if append request
failed due to mirror down and replica recovered
Key: HDFS-11674
URL: https://issues.apache.org/jira/browse/HDFS-11674
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Reporter: Vinayakumar B
Assignee: Vinayakumar B
Scenario:
1. 3 Node cluster with
"dfs.client.block.write.replace-datanode-on-failure.policy" as DEFAULT
Block is written with x data.
2. One of the Datanode, NOT the first DN, is down
3. Client tries to append data to block and fails since one DN is down.
4. calls recoverLease() on the file.
5. Successfull recovery happens.
Issue:
1. DNs which were connected from client before encountering mirror down, will
have the reservedSpaceForReplicas incremented, BUT never decremented.
2. So in long run DN's all space will be in reservedSpaceForReplicas resulting
OutOfSpace errors.
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