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From "Stefan Podkowinski (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13040) Estimated TS drop-time histogram updated with Cell.NO_DELETION_TIME
Date Tue, 13 Dec 2016 10:51:58 GMT
Stefan Podkowinski created CASSANDRA-13040:
----------------------------------------------

             Summary: Estimated TS drop-time histogram updated with Cell.NO_DELETION_TIME
                 Key: CASSANDRA-13040
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13040
             Project: Cassandra
          Issue Type: Bug
            Reporter: Stefan Podkowinski
            Assignee: Stefan Podkowinski


Starting with 3.0, {{MetadataCollector.updateLocalDeletionTime(int newLocalDeletionTime)}}
will be called with {{cell.localDeletionTime()}} in order to update the min/max deletion times
as well as the {{estimatedTombstoneDropTime}} histogram. Currently this also happens for {{Cell.NO_DELETION_TIME}}
({{Integer.MAX_VALUE}}), which causes the histogram to be called for every regular cell.

This can be easily verified by using {{sstablemetadata}} on any sstable. You should be able
to find a very high value for 2147483647 in the "Estimated tombstone drop times" section.

At this point, I don't think this is causing serious harm, but could be a performance issue
(see linked ticket). Calculated droppable TS times should not be affected.



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