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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-3772) Hadoop DNS.reverseDns() doesn't canonicalize host names, leading to possible discrepancy in RS hostname vs. Master seen hostname for RS
Date Tue, 12 Apr 2011 19:40:07 GMT
Hadoop DNS.reverseDns() doesn't canonicalize host names, leading to possible discrepancy in
RS hostname vs. Master seen hostname for RS
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                 Key: HBASE-3772
                 URL: https://issues.apache.org/jira/browse/HBASE-3772
             Project: HBase
          Issue Type: Bug
            Reporter: Gary Helmling


I ran across this issue on a 0.20 based branch, so I'm not sure if this is still an issue
for 0.90+.  However, 0.90 and current trunk do still make use of DNS.getDefaultHost(), so
I wanted to open this for discussion.

In 0.20, the problem was:

 1. configure hbase-site.xml with hbase.regionserver.dns.interface=xxx
 2. IP bound on interface xxx has reverse DNS correctly configured
 3. DNS.getDefaultHost() calls DNS.reverseDns() for this IP, which does a JNDI bind to the
DNS provider, returning the *absolute* hostname: host1.my.domain.
 4. RS reports startup to master as host1.my.domain.,60020,1234...
 5. BaseScanner when scanning .META. sees region assignments as not valid because the resolved
hostname from IP goes through InetSocketAddress.getHostName() which returns the canonicalized
form (host1.my.domain != host1.my.domain. though they are equivalent)

I know the master <-> RS negotiated hostname has completely changed for 0.90.  So hopefully
this is no longer an issue and we can close as invalid and go have a beer.  But given the
underlying problem in DNS.getDefaultHost(), I wanted to confirm this.

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