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https://issues.apache.org/jira/browse/HBASE-22378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xu Cang reassigned HBASE-22378:
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Assignee: Caroline
> HBase Canary fails with TableNotFoundException when table deleted during
> Canary run
> -----------------------------------------------------------------------------------
>
> Key: HBASE-22378
> URL: https://issues.apache.org/jira/browse/HBASE-22378
> Project: HBase
> Issue Type: Bug
> Components: canary
> Affects Versions: 1.3.0, 1.4.0, 1.5.0
> Reporter: Caroline
> Assignee: Caroline
> Priority: Minor
> Labels: Canary
>
> In 1.3.2 branch-1, we saw a drastic increase in TableNotFoundExceptions
> thrown by HBase Canary. We traced the issue back to Canary trying to call
> isTableEnabled() on temporary tables that were deleted in the middle of the
> Canary run.
> In this version of HBase Canary, Canary throws TableNotFoundException (and
> then fails) if a table is deleted between admin.listTables() and
> admin.tableEnabled() function calls in RegionMonitor's sniff() method.
> Following the goal of RegionMonitor.sniff(), which is to query all existing
> tables, in order to reduce noise we should skip over a table (i.e. don't
> check if it was enabled, or do anything else with it at all) if it was
> returned in listTables() but deleted before Canary can query it. Temporary
> tables which are not meant to be kept should not throw
> TableNotFoundExceptions which fail the Canary.
> Patch in progress:
> Add a call to admin.tableExists() before tableEnabled() on line 1244 in
> RegionMonitor.sniff().
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