Caroline created HBASE-22378:
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Summary: 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: 1.4.0, 1.3.0, 1.5.0
Reporter: Caroline
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.tableExists()
function calls in RegionMonitor's sniff() method. Following the goal of
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.
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