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https://issues.apache.org/jira/browse/HDFS-17311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan resolved HDFS-17311.
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Fix Version/s: 3.5.0
Hadoop Flags: Reviewed
Target Version/s: 3.5.0
Resolution: Fixed
> RBF: ConnectionManager creatorQueue should offer a pool that is not already
> in creatorQueue.
> --------------------------------------------------------------------------------------------
>
> Key: HDFS-17311
> URL: https://issues.apache.org/jira/browse/HDFS-17311
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: liuguanghua
> Assignee: liuguanghua
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.0
>
>
> In the Router, find blow log
>
> 2023-12-29 15:18:54,799 ERROR
> org.apache.hadoop.hdfs.server.federation.router.ConnectionManager: Cannot add
> more than 2048 connections at the same time
>
> The log indicates that ConnectionManager.creatorQueue is full at a certain
> point. But my cluster does not have so many users cloud reach up 2048 pair of
> <user,nn>.
> This may be due to the following reasons:
> # ConnectionManager.creatorQueue is a queue that will be offered
> ConnectionPool if ConnectionContext is not enough.
> # ConnectionCreator thread will consume from creatorQueue and make more
> ConnectionContexts for a ConnectionPool.
> # Client will concurrent invoke for ConnectionManager.getConnection() for a
> same user. And this maybe lead to add many same ConnectionPool into
> ConnectionManager.creatorQueue.
> # When creatorQueue is full, a new ConnectionPool will not be added in
> successfully and log this error. This maybe lead to a really new
> ConnectionPool clould not produce more ConnectionContexts for new user.
> So this pr try to make creatorQueue will not add same ConnectionPool at once.
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