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https://issues.apache.org/jira/browse/HDFS-17290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan resolved HDFS-17290.
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Hadoop Flags: Reviewed
Resolution: Fixed
> HDFS: add client rpc backoff metrics due to disconnection from lowest
> priority queue
> ------------------------------------------------------------------------------------
>
> Key: HDFS-17290
> URL: https://issues.apache.org/jira/browse/HDFS-17290
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.10.0, 3.4.0
> Reporter: Lei Yang
> Assignee: Lei Yang
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> Clients are backoff when rpcs cannot be enqueued. However there are different
> scenarios when backoff could happen. Currently there is no way to
> differenciate whether a backoff happened due to lowest prio+disconnection or
> queue overflow from higher priority queues when connection between client and
> namenode remains open. Currently IPC server just emits a single metrics for
> all the backoffs.
> Example:
> # Client are directly enqueued into lowest priority queue and backoff when
> lowest queue is full. Client are expected to disconnect from namenode.
> # Client are enqueued into non-lowest priority queue and overflowed all the
> way down to lowest priority queue and back off. In this case, connection
> between client and namenode remains open.
> We would like to add metrics for #1
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