accumulo-notifications mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Michael Wall (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-4483) NegativeArraySizeException from scan thread right after minor compaction
Date Thu, 16 Feb 2017 20:08:41 GMT


Michael Wall commented on ACCUMULO-4483:

bq. Curious that we didn't uncover this in any testing for 1.8.0. 

Did we not find this bug in testing because we don't have custom iterators on our tables during

> NegativeArraySizeException from scan thread right after minor compaction
> ------------------------------------------------------------------------
>                 Key: ACCUMULO-4483
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.8.0
>         Environment: Accumulo 1.8.0
> Java 1.8.0_72
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>            Priority: Blocker
>              Labels: hackathon2016
>             Fix For: 1.8.1, 2.0.0
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
> I have been getting NegativeArraySizeExceptions after upgrading to Accumulo 1.8.0. I
have tracked it down to 2 or more concurrent scans on a tablet that has just undergone minor
compaction. The minor compaction thread writes the in-memory map to a local temporary rfile
and tries to switch the current iterators to use it instead of the native map. The iterator
code in the scan thread may also switch itself to use the local temporary rfile it if notices
it before the minor compaction threads performs the switch. This all works up to this point.
Shortly after the switch one of the iterator threads will get a NegativeArraySizeException
> -> SourceSwitchingIterator.readNext() ->
-> MemKeyConversionIterator.getTopKeyValue() ->MemValue.decode(). I added a bunch of
logging to find that the length of the byte array passed to MemValue.decode is zero.

This message was sent by Atlassian JIRA

View raw message