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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CRUNCH-471) Add synchronization checks to DoFnIterator
Date Wed, 24 Sep 2014 21:51:34 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Josh Wills resolved CRUNCH-471.
-------------------------------
    Resolution: Fixed

Pushed to master.

> Add synchronization checks to DoFnIterator
> ------------------------------------------
>
>                 Key: CRUNCH-471
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-471
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.11.0
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>             Fix For: 0.12.0
>
>         Attachments: CRUNCH-471.patch
>
>
> I hit this one when I was working on a port of the Hadoop Streaming logic to Crunch:
if a DoFn emits records via some sort of asynchronous process (e.g., a daemon thread), it
can cause a problem for DoFnIterator, which doesn't have thread-safe controls over its underlying
records list. Easy fix is to make the accessor methods for CacheEmitter inside of DoFnIterator
synchronized.



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