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https://issues.apache.org/jira/browse/SPARK-664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14530859#comment-14530859
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Reynold Xin commented on SPARK-664:
-----------------------------------
I'm going to close this due to inactivity. Also unclear because based on PRs
submitted in the past we are going towards the direction of lower latency
rather than higher throughput.
> Accumulator updates should get locally merged before sent to the driver
> -----------------------------------------------------------------------
>
> Key: SPARK-664
> URL: https://issues.apache.org/jira/browse/SPARK-664
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Imran Rashid
> Priority: Minor
>
> Whenever a task finishes, the accumulator updates from that task are
> immediately sent back to the driver. When the accumulator updates are big,
> this is inefficient because (a) a lot more data has to be sent to the driver
> and (b) the driver has to do all the work of merging the updates together.
> Probably doesn't matter for small accumulators / low number of tasks, but if
> both are big, this could be a big bottleneck.
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