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From "Fengnan Li (Jira)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-856) Connection imbalance leads to overloaded ZK instances
Date Thu, 09 Jan 2020 06:29:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011471#comment-17011471

Fengnan Li commented on ZOOKEEPER-856:

[~eolivelli] I saw you are tagging this fix to be in the version zk 3.7.0, is there a patch
already somewhere? We are facing similar issues here. Thanks!

> Connection imbalance leads to overloaded ZK instances
> -----------------------------------------------------
>                 Key: ZOOKEEPER-856
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-856
>             Project: ZooKeeper
>          Issue Type: Bug
>            Reporter: Travis Crawford
>            Assignee: Mahadev Konar
>            Priority: Major
>             Fix For: 3.5.7, 3.7.0
>         Attachments: zk_open_file_descriptor_count_members.gif, zk_open_file_descriptor_count_total.gif
> We've experienced a number of issues lately where "ruok" requests would take upwards
of 10 seconds to return, and ZooKeeper instances were extremely sluggish. The sluggish instance
requires a restart to make it responsive again.
> I believe the issue is connections are very imbalanced, leading to certain instances
having many thousands of connections, while other instances are largely idle.
> A potential solution is periodically disconnecting/reconnecting to balance connections
over time; this seems fine because sessions should not be affected, and therefore ephemaral
nodes and watches should not be affected.

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