ASF GitHub Bot commented on NIFI-4944:

GitHub user mattyb149 opened a pull request:


    NIFI-4944: Guard against race condition in Snappy for PutHiveStreaming

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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/mattyb149/nifi NIFI-4944

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2519
commit 20de68f5e33039c2bb4d3ecd79eddd5e882aa8db
Author: Matthew Burgess <mattyb149@...>
Date:   2018-03-07T20:19:39Z

    NIFI-4944: Guard against race condition in Snappy for PutHiveStreaming


> PutHiveStreaming multiple instances with Snappy fail intermittently
> -------------------------------------------------------------------
>                 Key: NIFI-4944
>                 URL: https://issues.apache.org/jira/browse/NIFI-4944
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>            Reporter: Matt Burgess
>            Assignee: Matt Burgess
>            Priority: Major
> When data coming into PutHiveStreaming is compressed with Snappy, then 
> multiple instances of PutHiveStreaming in a flow can cause a failure, the log 
> often shows the following: 
> org.apache.nifi.processors.hive.PutHiveStreaming$$Lambda$510/1467586448@68a5884d
>  failed to process due to org.xerial.snappy.SnappyError: 
> [FAILED_TO_LOAD_NATIVE_LIBRARY] null; rolling back session: {} 
> This is due to a race condition in Snappy 1.0.5 (the version used by the Hive 
> NAR) where two classloaders can try to define the native loader class, thus 
> the second one would fail, giving the error above.
> The proposed solution is to guarantee that Snappy is loaded before this 
> situation is encountered (i.e. before the InstanceClassLoaders are created).

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