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Posted to hdfs-issues@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2015/08/17 21:00:46 UTC

[jira] [Updated] (HDFS-8792) BlockManager#postponedMisreplicatedBlocks should use a LightWeightHashSet to save memory

     [ https://issues.apache.org/jira/browse/HDFS-8792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-8792:
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    Summary: BlockManager#postponedMisreplicatedBlocks should use a LightWeightHashSet to save memory  (was: Improve BlockManager#postponedMisreplicatedBlocks)

> BlockManager#postponedMisreplicatedBlocks should use a LightWeightHashSet to save memory
> ----------------------------------------------------------------------------------------
>
>                 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, HDFS-8792.002.patch, HDFS-8792.003.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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