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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