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https://issues.apache.org/jira/browse/HDFS-3425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396426#comment-13396426
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Brandon Li commented on HDFS-3425:
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Hi Todd, thanks for reviewing it. One implementation here is better than two.
:-)
I am not sure I got the idea about using selectInputStreams() instead of
if(usesJournalService()). Is your branch currently visible, so we can see an
example?
> Enable standby namenode to tail edits from journal service
> ----------------------------------------------------------
>
> Key: HDFS-3425
> URL: https://issues.apache.org/jira/browse/HDFS-3425
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, name-node
> Reporter: Brandon Li
> Assignee: Brandon Li
> Attachments: HDFS-3425.HDFS-3092.patch, HDFS-3425.HDFS-3092.patch.2
>
>
> In an HA cluster with the journal service configured, namenode should get
> edit logs from journal service instead of from local or shared storage
> directories.
> As one of the first steps towards this goal, this JIRA is to enable standby
> namenode to tail edits from journal services.
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