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From "Weihua Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4074) When a RS has hostname with uppercase letter, there are two RS entries in master
Date Thu, 07 Jul 2011 07:47:17 GMT
When a RS has hostname with uppercase letter, there are two RS entries in master
--------------------------------------------------------------------------------

                 Key: HBASE-4074
                 URL: https://issues.apache.org/jira/browse/HBASE-4074
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.90.3, 0.90.2, 0.90.1
            Reporter: Weihua Jiang


When a RS has uppercase letter in its hostname, e.g. Harpertown08-15.sh.intel.com. Then, there
will be two RS entries in master report, they are
 harpertown08-15.sh.intel.com
 Harpertown08-15.sh.intel.com

This leads to wrong region allocation.

This problem is caused by the implementation of java.net.InetSocketAddress.

The logic is:
1. RS Harpertown08-15.sh.intel.com sends its DNS resolved hostname harpertown08-15.sh.intel.com
to master for registration in HRegionServer.reportForDuty().
2. Master handles it and returns harpertown08-15.sh.intel.com via HServerAddress object to
RS to notify it this new name (actually the same as the one reported by RS).
3. HServerAddress deserialize this object by first read out hostname as string ("harpertown08-15.sh.intel.com")
and construct a InetSocketAddress object.
4. RS get the new name by call this InetSocketAddress.getHostName() method which returns Harpertown08-15.sh.intel.com
instead.
5. In latter hearbeat communication (HRegionServer.tryRegionServerReport()), RS uses this
new name (Harpertown08-15.sh.intel.com) to report to master and master regard it as a new
RS. Thus, two RS entries exist. 

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