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https://issues.apache.org/jira/browse/HDFS-7609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ming Ma updated HDFS-7609:
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Attachment: HDFS-7609.patch
Here is the draft patch that prevents client from polluting the retry cache
when standby is being transitioned to active. It doesn't cover other possible
optimization ideas discussed above. Appreciate any input on this.
> startup used too much time to load edits
> ----------------------------------------
>
> Key: HDFS-7609
> URL: https://issues.apache.org/jira/browse/HDFS-7609
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.2.0
> Reporter: Carrey Zhan
> Attachments: HDFS-7609-CreateEditsLogWithRPCIDs.patch,
> HDFS-7609.patch, recovery_do_not_use_retrycache.patch
>
>
> One day my namenode crashed because of two journal node timed out at the same
> time under very high load, leaving behind about 100 million transactions in
> edits log.(I still have no idea why they were not rolled into fsimage.)
> I tryed to restart namenode, but it showed that almost 20 hours would be
> needed before finish, and it was loading fsedits most of the time. I also
> tryed to restart namenode in recover mode, the loading speed had no different.
> I looked into the stack trace, judged that it is caused by the retry cache.
> So I set dfs.namenode.enable.retrycache to false, the restart process
> finished in half an hour.
> I think the retry cached is useless during startup, at least during recover
> process.
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