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From "Jesse Yates (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11935) Unbounded creation of Replication Failover workers
Date Wed, 10 Sep 2014 18:51:33 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesse Yates updated HBASE-11935:
--------------------------------
    Attachment: hbase-11935-0.98-v0.patch

Attaching fix for 0.98. Worked up with [~lhofhansl], [~apurtell] and rest of the folks at
Salesforce.

Not sure if there is a good way to test for this behavior that isn't completely pointless.

> Unbounded creation of Replication Failover workers
> --------------------------------------------------
>
>                 Key: HBASE-11935
>                 URL: https://issues.apache.org/jira/browse/HBASE-11935
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Jesse Yates
>            Priority: Critical
>             Fix For: 2.0.0, 0.98.7, 0.94.24, 0.99.1
>
>         Attachments: hbase-11935-0.98-v0.patch
>
>
> We just ran into a production incident with TCP SYN storms on port 2181 (zookeeper).
> In our case the slave cluster was not running. When we bounced the primary cluster we
saw an "unbounded" number of failover threads all hammering the hosts on the slave ZK machines
(which did not run ZK at the time)... Causing overall degradation of network performance between
datacenters.
> Looking at the code we noticed that the thread pool handling of the Failover workers
was probably unintended.
> Patch coming soon.



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