[jira] [Created] (HDFS-14349) Edit log may be rolled more frequently than necessary with multiple Standby nodes

["Erik Krogen (JIRA)" <ji...@apache.org>]

Erik Krogen created HDFS-14349:
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             Summary: Edit log may be rolled more frequently than necessary with multiple Standby nodes
                 Key: HDFS-14349
                 URL: https://issues.apache.org/jira/browse/HDFS-14349
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha, hdfs, qjm
            Reporter: Erik Krogen
            Assignee: Ekanth Sethuramalingam


When HDFS-14317 was fixed, we tackled the problem that in a cluster with in-progress edit log tailing enabled, a Standby NameNode may _never_ roll the edit logs, which can eventually cause data loss.

Unfortunately, in the process, it was made so that if there are multiple Standby NameNodes, they will all roll the edit logs at their specified frequency, so the edit log will be rolled X times more frequently than they should be (where X is the number of Standby NNs). This is not as bad as the original bug since rolling frequently does not affect correctness or data availability, but may degrade performance by creating more edit log segments than necessary.



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