[jira] [Created] (HDFS-11674) reserveSpaceForReplicas is not released if append request failed due to mirror down and replica recovered

["Vinayakumar B (JIRA)" <ji...@apache.org>]

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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