apex-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From chandnisingh <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: APEXMALHAR-2068 made noop defa...
Date Sat, 30 Apr 2016 00:02:24 GMT
Github user chandnisingh commented on a diff in the pull request:

    --- Diff: library/src/main/java/com/datatorrent/lib/io/fs/FileSplitterInput.java ---
    @@ -96,7 +96,7 @@ public FileSplitterInput()
         currentWindowRecoveryState = Lists.newLinkedList();
    -    idempotentStorageManager = new IdempotentStorageManager.FSIdempotentStorageManager();
    +    idempotentStorageManager = new IdempotentStorageManager.NoopIdempotentStorageManager();
    --- End diff --
    The reason to make this change is that if multiple ```FSIdempotentStorageManager```s 
are used in an application then their state (on disk) collide.  The jira APEXMALHAR-2068 is
opened to address that. 
    The problem in having FSIdempotentStorageManager as default is that the users get bewildered
because of in-correct behavior manifested by the bug mentioned above.
    If the user sets FSIdempotentStorageManage explicitly then they can ensure to make the
relative path unique as well.
    Not setting any default entails additional step of setting an Idempotent storage manager
even when the user doesn't care about idempotency. 

If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.

View raw message