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Posted to issues@spark.apache.org by "yuhao yang (JIRA)" <ji...@apache.org> on 2016/11/23 20:24:58 UTC
[jira] [Commented] (SPARK-18548) OnlineLDAOptimizer reads the same
broadcast data after deletion
[ https://issues.apache.org/jira/browse/SPARK-18548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15691290#comment-15691290 ]
yuhao yang commented on SPARK-18548:
------------------------------------
Hi [~sunxiaoye0116] by second time, do you mean the line {code}val batchResult = statsSum :* expElogbeta.t {code}
If yes, then I don't see it as a trouble since that line runs only on driver.
> OnlineLDAOptimizer reads the same broadcast data after deletion
> ---------------------------------------------------------------
>
> Key: SPARK-18548
> URL: https://issues.apache.org/jira/browse/SPARK-18548
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 1.6.1
> Reporter: Xiaoye Sun
> Priority: Trivial
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> In submitMiniBatch() called by OnlineLDAOptimizer, broadcast variable expElogbeta is deleted before its use in the second time, which causes the executor reads the same large broadcast data twice. I suggest to move the broadcast data deletion (expElogbetaBc.unpersist()) later.
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