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https://issues.apache.org/jira/browse/HDFS-8792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14639285#comment-14639285
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Arpit Agarwal commented on HDFS-8792:
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Hi [~hitliuyi], do you have any estimates of the memory saved by using
LightWeightHashSet?
> Use LightWeightHashSet for BlockManager#postponedMisreplicatedBlocks
> --------------------------------------------------------------------
>
> Key: HDFS-8792
> URL: https://issues.apache.org/jira/browse/HDFS-8792
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Yi Liu
> Assignee: Yi Liu
> Attachments: HDFS-8792.001.patch
>
>
> {{LightWeightHashSet}} requires fewer memory than java hashset.
> Furthermore, for {{excessReplicateMap}}, we can use {{HashMap}} instead of
> {{TreeMap}} instead, since no need to sort.
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