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https://issues.apache.org/jira/browse/HBASE-1571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-1571.
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> HBaseClient.Connection.sendParam is not synchronized, which may lead to an NPE
> ------------------------------------------------------------------------------
>
> Key: HBASE-1571
> URL: https://issues.apache.org/jira/browse/HBASE-1571
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.19.2, 0.19.3
> Reporter: Eugene Kirpichov
> Priority: Major
>
> Suppose that two threads are concurrently calling HBaseClient.getConnection()
> to an address to which no connection has been made yet, or one existed but
> has been dropped due to an error.
> One of the threads creates a Connection object, puts it into the
> 'connections' map, and there, starts doing setupIOStreams, and there goes a
> context switch.
> The second thread also calls getConnection and gets a connection from the
> 'connections' map, whose 'out' stream is only going to be initialized by the
> second thread, but has not yet been. There, at synchronized(this.out), goes
> an NPE.
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