HA: Active NN may purge edit log files before standby NN has a chance to read
them
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Key: HDFS-2794
URL: https://issues.apache.org/jira/browse/HDFS-2794
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
Given that the active NN is solely responsible for purging finalized edit log
segments, and given that the active NN has no way of knowing when the standby
reads edit logs, it's possible that the standby NN could fail to read all
edits it needs before the active purges the files.
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