[ 
https://issues.apache.org/jira/browse/HIVE-21266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Eugene Koifman reassigned HIVE-21266:
-------------------------------------


> Issue with single delta file
> ----------------------------
>
>                 Key: HIVE-21266
>                 URL: https://issues.apache.org/jira/browse/HIVE-21266
>             Project: Hive
>          Issue Type: Sub-task
>    Affects Versions: 4.0.0
>            Reporter: Eugene Koifman
>            Assignee: Vaibhav Gumashta
>            Priority: Major
>
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/CompactorMR.java#L353-L357]
>  
> {noformat}
> if ((deltaCount + (dir.getBaseDirectory() == null ? 0 : 1)) + origCount <= 1) 
> {
>       LOG.debug("Not compacting {}; current base is {} and there are {} 
> deltas and {} originals", sd.getLocation(), dir
>           .getBaseDirectory(), deltaCount, origCount);
>       return;
>     }
>  {noformat}
> Is problematic.
> Suppose you have 1 delta file from streaming ingest: {{delta_11_20}} where 
> {{txnid:13}} was aborted.  The code above will not rewrite the delta (which 
> drops anything that belongs to the aborted txn) and transition the compaction 
> to "ready_for_cleaning" which will drop the metadata about the aborted txn.  
> Now aborted data will come back as committed.



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