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https://issues.apache.org/jira/browse/HDFS-11306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDFS-11306:
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Attachment: HDFS-11306.001.patch
Upload patch v001. This patch adds a private method that dumps edit logs in
human readable formation into namenode log. A test case is also added.
Any suggestion is greatly appreciated. I honestly do not have much experience
in edit logs and HA.
> Dump remaining edit logs from buffer if edit log can't be rolled.
> -----------------------------------------------------------------
>
> Key: HDFS-11306
> URL: https://issues.apache.org/jira/browse/HDFS-11306
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ha, namenode
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Attachments: HDFS-11306.001.patch
>
>
> In HDFS-10943 [~yzhangal] reported that edit log can not be rolled due to
> unexpected edit logs lingering in the buffer.
> Unable to root cause the bug, I propose that we dump the remaining edit logs
> in the buffer into namenode log, before crashing namenode. Use this new
> capability to find the ops that sneaks into the buffer unexpectedly, and
> hopefully catch the bug.
> This effort is orthogonal, but related to HDFS-11292, which adds additional
> informational logs to help debug this issue.
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