[jira] [Updated] (ZOOKEEPER-856) Connection imbalance leads to overloaded ZK instances

["Michael Han (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Han updated ZOOKEEPER-856:
----------------------------------
    Fix Version/s:     (was: 3.5.3)
                   3.5.4

> 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
>             Fix For: 3.5.4, 3.6.0
>
>         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.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)