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https://issues.apache.org/jira/browse/HBASE-7035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708010#comment-13708010
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Devin Bayer commented on HBASE-7035:
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Hi Lars:
If we just put HTable back into the pool, I think the connection count will
never be reduced, so it will never reach zero and we'll be OK. If that isn't
guaranteed by HTablePool, we must wait until the thrift connection is closed.
However, the
[HTable|https://github.com/apache/hbase/blob/0.94/src/main/java/org/apache/hadoop/hbase/client/HTable.java]
interface doesn't guarantee thread safety between scanners, so we can't share
them between threads anyway.
We might as well just hold onto the HTable until the thrift connection is
closed or we're really getting too deep into HBase internals.
> thrift server closes HTable of open Scanners
> --------------------------------------------
>
> Key: HBASE-7035
> URL: https://issues.apache.org/jira/browse/HBASE-7035
> Project: HBase
> Issue Type: Sub-task
> Components: Thrift
> Affects Versions: 0.94.4
> Reporter: Devin Bayer
> Labels: thrift2
> Attachments: old-hbase-thrift-v1.patch
>
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> ThriftHBaseServiceHandler.openScanner() does this:
> 1. table = pool.getTable()
> 2. scanner = table.getScanner()
> 3. table.close()
> 4. return scanner
> While back porting the thrift server to 0.92.6, I found that table.close()
> calls connection.close(). Further calls to scanner.next() raise a
> ConnectionClosed exception. The unit tests do not catch this since they reuse
> an open HConnection instance.
> This might work on trunk, but depends on the implementations of HTablePool,
> HTable and HConnectionManager. Even with the pool wrapper, if the pool is
> full, table.close() may be called, which may invalidate the table. Also,
> HTable is not thread-safe, but they are being reused since they go back in
> the pool.
> I suggest storing the table handle along with the scanner.
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