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https://issues.apache.org/jira/browse/HBASE-4283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl reassigned HBASE-4283:
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Assignee: Lars Hofhansl
> HBaseAdmin never recovers from restarted cluster
> ------------------------------------------------
>
> Key: HBASE-4283
> URL: https://issues.apache.org/jira/browse/HBASE-4283
> Project: HBase
> Issue Type: Bug
> Components: client
> Affects Versions: 0.92.0
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Minor
> Fix For: 0.92.0
>
> Attachments: 4283.txt, HBasePing.java
>
>
> While testing common scenarios that we might encounter I found that
> HBaseAdmin does not recover from a restarted cluster.
> It turns out HBaseClient.Connection.stop() is send into an endless loop here:
> {code}
> // wait until all connections are closed
> while (!connections.isEmpty()) {
> try {
> Thread.sleep(100);
> } catch (InterruptedException ignored) {
> }
> }
> {code}
> The reason is that PoolMap.remove(k,v) does not remove empty pools, and hence
> connections.isEmpty() is never true if there ever was any connection in there.
> My fix is to remove the pool from the poolMap when it is empty.
> (Alternatively one could change PoolMap.isEmpty() to also look inside of all
> pools and see if their size is 0).
> When I fixed that I noticed that if the master wasn't running when HBaseAdmin
> is created it also will not recover from that.
> Even creating a new HBaseAdmin from the same Configuration will still use the
> old stale HConnection.
> In that case a MasterNotRunningException is thrown, which is not handled in
> HBaseAdmin's constructor.
> The HConnection handling in HConnectionManager is funky. There should never
> be a closed connection in the HBASE_INSTANCES.
> I might look at that as well but in a separate issue.
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