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https://issues.apache.org/jira/browse/HBASE-1691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-1691.
-----------------------------------
Resolution: Won't Fix
> hbase 0.20 on hadoop 0.19 (WAS ->Cannot connect to 0.20 HBase from an MR job
> running on a 0.19.0 version of Hadoop)
> -------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-1691
> URL: https://issues.apache.org/jira/browse/HBASE-1691
> Project: Hadoop HBase
> Issue Type: Bug
> Components: client
> Affects Versions: 0.20.0
> Reporter: Eric Tschetter
> Attachments: hbase-1691-0.20.0.patch
>
>
> When running MR jobs on 0.19.0 Hadoop, the hadoop core libraries get loaded
> by the classloader before 0.20 libraries included in the job jar.
> HBaseClient makes a call to org.apache.hadoop.net.NetUtils.connect on line
> 305 which does not exist in previous versions of the hadoop jars and
> therefore results in NoSuchMethodErrors getting thrown.
> As a simple workaround, you can replace the call
> NetUtils.connect(socket, remoteId.getAddress(), 20000);
> with
> socket.connect(remoteId.getAddress(), 20000);
> Note, however, that the javadoc on the NetUtils.connect() method makes
> mention of sun's implementation of stuff being less than wonderful, so the
> existence of this JIRA and this workaround should not be taken as meaning
> that this is actually a recommended solution.
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