Arpit Agarwal created HDFS-6978:
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Summary: Directory scanner should correctly reconcile blocks on
RAM disk
Key: HDFS-6978
URL: https://issues.apache.org/jira/browse/HDFS-6978
Project: Hadoop HDFS
Issue Type: Sub-task
Components: datanode
Affects Versions: HDFS-6581
Reporter: Arpit Agarwal
Assignee: Arpit Agarwal
Currently it would be a very unlikely situation for the directory scanner to
encounter two replicas of the same block on different volumes. Hence the
scanner does not handle this situation predictable.
With memory storage, it is common to save blocks to persistent storage and
eviction of the original RAM disk block could fail since the block is in use.
In this situation, the directory scanner should never delete the block on
persistent storage.
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