[
https://issues.apache.org/jira/browse/HBASE-11935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Lars Hofhansl resolved HBASE-11935.
-----------------------------------
Resolution: Implemented
> ZooKeeper connection storm after queue failover with slave cluster down
> -----------------------------------------------------------------------
>
> Key: HBASE-11935
> URL: https://issues.apache.org/jira/browse/HBASE-11935
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.99.0, 2.0.0, 0.94.23, 0.98.6
> Reporter: Lars Hofhansl
> Priority: Critical
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
