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https://issues.apache.org/jira/browse/SPARK-4621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15054346#comment-15054346
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Apache Spark commented on SPARK-4621:
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User 'lianhuiwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/10277
> Shuffle index can be cached for SortShuffleManager in ExternalShuffle in
> order to reduce indexFile's io
> --------------------------------------------------------------------------------------------------------
>
> Key: SPARK-4621
> URL: https://issues.apache.org/jira/browse/SPARK-4621
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Reporter: Lianhui Wang
> Priority: Minor
>
> in IndexShuffleBlockManager, we can use LRUCache to store recently finished
> shuffle index and that can reduce indexFile's io.
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