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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4021) bulk imports slow file garbage collection
Date Tue, 06 Oct 2015 14:36:27 GMT
Eric Newton created ACCUMULO-4021:
-------------------------------------

             Summary: bulk imports slow file garbage collection
                 Key: ACCUMULO-4021
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4021
             Project: Accumulo
          Issue Type: Bug
          Components: gc
         Environment: large production system
            Reporter: Eric Newton
            Assignee: Eric Newton


On a large system, bulk imports slow file garbage collection to a craw.  The total number
of files to be deleted was about 14 million. Initially, it would run quickly, but then slow
down, to the point where only a few files would be deleted every few minutes. The jvm was
only using 50% of the CPU (and therefore, probably not GC thrashing). JStacks showed the collector
scanning the metadata table to remove referenced files from the delete list.

If the bulk ingest requests were stopped, the GC completed quickly.



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