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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1679) Flapping DNS does us more harm than it need to
Date Tue, 21 Jul 2009 21:43:14 GMT
Flapping DNS does us more harm than it need to
----------------------------------------------

                 Key: HBASE-1679
                 URL: https://issues.apache.org/jira/browse/HBASE-1679
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack


Over in HBASE-1675, JSharp has posted logs where a temporary DNS outage does his cluster a
death blow.

When cluster members report in, the master composes the regionserver name by doing a hostname
lookup and appending it to port and startcode passed over by the regionserver.  The host lookup
during a DNS outage when from name to IP.  Master then thought this regionserver an unknown
host and told it restart.... and so on.

If the regionserver composed its name once, it could pass this the master and avoid a DNS
lookup per regionserver report.

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