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Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2014/09/24 23:11:34 UTC

[jira] [Created] (CRUNCH-471) Add synchronization checks to DoFnIterator

Josh Wills created CRUNCH-471:
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             Summary: 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


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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