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From "Andreas Neumann (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TEPHRA-244) Invalid tx pruning does not handle deletion of tables well
Date Sat, 19 Aug 2017 16:45:00 GMT
Andreas Neumann created TEPHRA-244:
--------------------------------------

             Summary: Invalid tx pruning does not handle deletion of tables well
                 Key: TEPHRA-244
                 URL: https://issues.apache.org/jira/browse/TEPHRA-244
             Project: Tephra
          Issue Type: Bug
          Components: core, manager
    Affects Versions: 0.12.0-incubating
            Reporter: Andreas Neumann
            Assignee: Andreas Neumann
             Fix For: 0.13.0-incubating


Suppose an application regularly creates and deletes tables (for example, temporary tables).
In such a scenario, there will always be such a temporary table when pruning runs, and its
regions will be recorded for that time. However, the region will be deleted before it ever
compacts or flushes, and it will never record prune information. Because all prune times have
such regions, there will never be a set of transactional regions that all have prune info,
and pruning will never happen. 

The fix is to exclude deleted tables from the list of regions at each time. This is all regions
of deleted tables (tables that do not exist any more), not deleted regions: a region may disappear
due to a split and its data will be in new regions. 




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