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https://issues.apache.org/jira/browse/HBASE-4557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479375#comment-13479375
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Ted Yu commented on HBASE-4557:
-------------------------------
One a related note:
It is difficult for user to find out the correlation between region name and
scanner name when they see:
{code}
Caused by: org.apache.hadoop.hbase.UnknownScannerException:
org.apache.hadoop.hbase.UnknownScannerException: Name: -3944363018500584369
at
org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:1869)
{code}
When entry keyed by scannerName is removed from scanners map, can we
temporarily store (scanner name, region name) mapping so that the above
exception message can provide more information to the user ?
> Do something better than UnknownScannerException
> ------------------------------------------------
>
> Key: HBASE-4557
> URL: https://issues.apache.org/jira/browse/HBASE-4557
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.4
> Reporter: Jean-Daniel Cryans
> Fix For: 0.96.0
>
>
> UnknownScannerException is a plague, there's no reason we should not at least
> try to create a new scanner. If that fails again, maybe try automatically
> setting a lower scanner caching (if possible and with proper loggin) and
> retry again.
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