Yongjun Zhang commented on HDFS-11306:

Thanks for the updated patch [~jojochuang]. Would you please take a look at the 
failed tests? I'm +1 other than that.

> Print 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, HDFS-11306.002.patch, 
> HDFS-11306.003.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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