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https://issues.apache.org/jira/browse/HBASE-3686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell closed HBASE-3686.
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> ClientScanner skips too many rows on recovery if using scanner caching
> ----------------------------------------------------------------------
>
> Key: HBASE-3686
> URL: https://issues.apache.org/jira/browse/HBASE-3686
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 0.89.20100924, 0.90.1
> Reporter: Sean Sechrist
> Assignee: Sean Sechrist
> Priority: Minor
> Attachments: 3686.patch
>
>
> This can cause rows to be lost from a scan.
> See this thread where the issue was brought up:
> http://search-hadoop.com/m/xITBQ136xGJ1
> If hbase.regionserver.lease.period is higher on the client than the server we
> can get this series of events:
> 1. Client is scanning along happily, and does something slow.
> 2. Scanner times out on region server
> 3. Client calls HTable.ClientScanner.next()
> 4. The region server throws an UnknownScannerException
> 5. Client catches exception and sees that it's not longer then it's
> hbase.regionserver.lease.period config, so it doesn't throw a
> ScannerTimeoutException. Instead, it treats it like a NSRE.
> Right now the workaround is to make sure the configs are consistent.
> A possible fix would be to use whatever the region server's scanner timeout
> is, rather than the local one.
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