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https://issues.apache.org/jira/browse/HDFS-14693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16898516#comment-16898516
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Xudong Cao commented on HDFS-14693:
-----------------------------------
Just add a log, does not need an unit test.
> NameNode should log a warning when EditLog IPC logger's pending size exceeds
> limit.
> -----------------------------------------------------------------------------------
>
> Key: HDFS-14693
> URL: https://issues.apache.org/jira/browse/HDFS-14693
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Xudong Cao
> Assignee: Xudong Cao
> Priority: Minor
> Attachments: HDFS-16493.001.patch
>
>
> In a production environment, there may be some differences in each
> JouranlNode (e.g. network condition, disk condition, and so on). For example,
> If a JN's network is much worse than other JNs, then the time taken by the NN
> to write this JN will be much greater than other JNs, in this case, it will
> cause the IPC Logger thread corresponding to this JN to have many pending
> edits, when the pending edits exceeds the maximum limit (default 10MB), the
> new edits about to write to this JN will be silently dropped, and will result
> gaps in the editlog segment, which causing this JN and NN repeatedly
> reporting the following errors:
> {code:java}
> org.apache.hadoop.hdfs.qjournal.protocol.JournalOutOfSyncException: Can't
> write txid 1904164873 expecting nextTxId=1904164871{code}
> Unfortunately, the above error message can not help us quickly find the root
> cause, so it's better to add a warning log to tell us the really reason, like
> this:
> {code:java}
> 2019-08-02 04:55:05,879 WARN
> org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager:Pending edits to
> 192.168.202.13:8485 is going to exceed limit size:10240, current queued edits
> size:10224, will silently drop 174 bytes of edits!{code}
> This is just a very small improvement.
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