[jira] [Created] (HDFS-5366) recaching improvements

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

Colin Patrick McCabe created HDFS-5366:
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             Summary: recaching improvements
                 Key: HDFS-5366
                 URL: https://issues.apache.org/jira/browse/HDFS-5366
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
    Affects Versions: HDFS-4949
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


There are a few things about our HDFS-4949 recaching strategy that could be improved.

* We should monitor the DN's maximum and current mlock'ed memory consumption levels, so that we don't ask the DN to do stuff it can't.

* We should not try to initiate caching on stale DataNodes (although we should not recache things stored on such nodes until they're declared dead).

* We might want to resend the {{DNA_CACHE}} or {{DNA_UNCACHE}} command a few times before giving up.  Currently, we only send it once.



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