Chris Nauroth created HDFS-5203:
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Summary: Concurrent clients that add a cache directive on the same
path may prematurely uncache from each other.
Key: HDFS-5203
URL: https://issues.apache.org/jira/browse/HDFS-5203
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: HDFS-4949
Reporter: Chris Nauroth
When a client adds a cache directive, we assign it a unique ID and return that
ID to the client. If multiple clients add a cache directive for the same path,
then we return the same ID. If one client then removes the cache entry for
that ID, then it is removed for all clients. Then, when this change becomes
visible in subsequent cache reports, the datanodes may {{munlock}} the block
before the other clients are done with it.
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