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

["Mahadev konar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903017#action_12903017 ] 

Mahadev konar commented on ZOOKEEPER-856:
-----------------------------------------

travis, 
 we have had a lot of discussion on load balancing. I'd really want to try and see how the disconnect and reconnect works for load balancing. I am also with you that it might be a good enough soln on load balancing. I can upload a simple patch for this. Would you have some bandwidth trying and it out and reporting how well it works?

> 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
>         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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