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https://issues.apache.org/jira/browse/HDFS-17438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jian Zhang updated HDFS-17438:
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Summary: RBF: The newest STANDBY and UNAVAILABLE nn should be the lowest
priority. (was: RBF: The latest STANDBY and UNAVAILABLE nn should be the
lowest priority.)
> RBF: The newest STANDBY and UNAVAILABLE nn should be the lowest priority.
> -------------------------------------------------------------------------
>
> Key: HDFS-17438
> URL: https://issues.apache.org/jira/browse/HDFS-17438
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jian Zhang
> Assignee: Jian Zhang
> Priority: Major
> Labels: pull-request-available
> Attachments: HDFS-17438.001.patch
>
>
> At present, when the status of all namenodes in an ns in the router is the
> same, the namenode which is the newest reported will be placed at the top of
> the cache. when the client accesses the ns through the router, it will first
> access the namenode.
> If multiple namenodes in this route are in an active state, or if there are
> namenodes with multiple observer states, the existing logic is not a problem,
> because the newest reported active or observer state namenode have a higher
> probability of being true active or observer compared to the namenode that
> reported active or observer state a long time ago.
> Similarly, the newest reported namenode with a status of standby or
> unavailable has a higher probability of being a standby or unavailable
> namenode compared to the namenode reported with a status of standby or
> unavailable a long time ago. Therefore, the newest nn reported as standby or
> unavailable status should have a lower priority for access, the oldest nn
> reported as standby or unavailable status should have a higher priority for
> access.
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