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From "Geoffrey Jacoby (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-4025) Make CachingHTableFactory thread-safe for 0.98 branch
Date Fri, 14 Jul 2017 17:02:00 GMT
Geoffrey Jacoby created PHOENIX-4025:
----------------------------------------

             Summary: Make CachingHTableFactory thread-safe for 0.98 branch
                 Key: PHOENIX-4025
                 URL: https://issues.apache.org/jira/browse/PHOENIX-4025
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 4.11.0
            Reporter: Geoffrey Jacoby
            Assignee: Geoffrey Jacoby
             Fix For: 4.12.0


CachingHTableFactory, which is used in global index writes, isn't thread-safe (see discussion
in PHOENIX-4021) and will be removed in the master and 4.x-HBase-1.x branches. However, according
to PHOENIX-3159 it's still needed in HBase 0.98-based Phoenix because creating HTables is
still heavy-weight in 0.98. 

This means it needs to be made thread-safe. Current plan is when an HTable's requested, check
the reference count (which is already tracked for cleanup purposes) and if the count is 1,
create a new HTable. We'll cache lists of identical HTables per HBase table, rather than 1
HTable per HBase table. 




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