[jira] [Created] (CASSANDRA-13040) Estimated TS drop-time histogram updated with Cell.NO_DELETION_TIME

["Stefan Podkowinski (JIRA)" <ji...@apache.org>]

Stefan Podkowinski created CASSANDRA-13040:
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             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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