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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11935) Unbounded creation of Replication Failover workers
Date Wed, 10 Sep 2014 18:48:34 GMT
Lars Hofhansl created HBASE-11935:
-------------------------------------

             Summary: 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
            Priority: Critical
             Fix For: 2.0.0, 0.98.7, 0.94.24, 0.99.1


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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