[jira] [Commented] (ACCUMULO-338) Combiners lose data when reading off of disk

["Billie Rinaldi (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ACCUMULO-338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190024#comment-13190024 ] 

Billie Rinaldi commented on ACCUMULO-338:
-----------------------------------------

We tracked this down to reuse of Value objects by the RFile.  Combiner should make a copy of the Values.  I'll make a functional test for this, too.  Nice catch, John!
                
> Combiners lose data when reading off of disk
> --------------------------------------------
>
>                 Key: ACCUMULO-338
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-338
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.4.0
>            Reporter: John Vines
>            Assignee: Billie Rinaldi
>             Fix For: 1.4.0
>
>
> There is a bug with Combiners in 1.4 resulting in bad data-
> to recreate-
> createtable test;
> config -t test -s table.iterator.minc.vers=10
> config -t test -s table.iterator.majc.vers=10
> config -t test -s table.iterator.scan.vers=10
> insert r f q 1
> insert r f q 2
> insert r f q 3
> setiter -class org.apache.accumulo.core.iterators.user.SummingCombiner -scan -n summer -p 60 -t test
> true
> STRING
> scan
> flush
> scan
> deleteiter -t test -n summer -scan
> scan
> You will see all three values the first scan, 6 for the second scan, 4 for the third scan, and all three values for the 4th scan. In debug I saw teh values 2, 1, and 1 in that order in the Viterator.next method.

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