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From "Liu Shaohui (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12943) Set sun.net.inetaddr.ttl in HBase
Date Thu, 29 Jan 2015 13:11:34 GMT
Liu Shaohui created HBASE-12943:
-----------------------------------

             Summary: Set sun.net.inetaddr.ttl in HBase
                 Key: HBASE-12943
                 URL: https://issues.apache.org/jira/browse/HBASE-12943
             Project: HBase
          Issue Type: Bug
            Reporter: Liu Shaohui
            Assignee: Liu Shaohui


The default value of config: sun.net.inetaddr.ttl is -1 and the java processes will cache
the mapping of hostname to ip address  forever, See: http://docs.oracle.com/javase/7/docs/technotes/guides/net/properties.html

But things go wrong when a regionserver with same hostname and different ip address rejoins
the hbase cluster. The HMaster will get wrong ip address of the regionserver from this cache
and every region assignment to this regionserver will be blocked for a time because the HMaster
can't communicate with the regionserver.

A tradeoff is to set the sun.net.inetaddr.ttl to 10m or 1h and make the wrong cache expired.

Suggestions are welcomed. Thanks~





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