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Posted to hdfs-issues@hadoop.apache.org by "Staffan Friberg (JIRA)" <ji...@apache.org> on 2015/10/09 20:05:05 UTC

[jira] [Updated] (HDFS-9221) Reduce allocation during block reports

     [ https://issues.apache.org/jira/browse/HDFS-9221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Staffan Friberg updated HDFS-9221:
----------------------------------
    Attachment: ReplicaState.patch

> Reduce allocation during block reports
> --------------------------------------
>
>                 Key: HDFS-9221
>                 URL: https://issues.apache.org/jira/browse/HDFS-9221
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: performance
>            Reporter: Staffan Friberg
>         Attachments: ReplicaState.patch
>
>
> When the BufferDecoder in BlockListAsLongs converts the stored value to a ReplicaState enum it calls ReplicaState.getState(int) unfortunately this method creates a ReplicaState[] for each call since it calls ReplicaState.values().
> This patch creates a cached version of the values and thus avoid all allocation when doing the conversion.



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