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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8900) Compact XAttrs to optimize memory footprint.
Date Mon, 24 Aug 2015 05:50:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14708819#comment-14708819

Yi Liu commented on HDFS-8900:

Thanks [~andrew.wang] and [~cmccabe]!
I will create a follow-on JIRA targeted on trunk to remove the max size config.

Failure of {{TestStartup.testXattrConfiguration}} is related, the new patch fixes it, and
also fixes the checkstyle and whitespace. The findbugs actually don't exist. 

> Compact XAttrs to optimize memory footprint.
> --------------------------------------------
>                 Key: HDFS-8900
>                 URL: https://issues.apache.org/jira/browse/HDFS-8900
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Yi Liu
>            Assignee: Yi Liu
>         Attachments: HDFS-8900.001.patch, HDFS-8900.002.patch
> {code}
> private final ImmutableList<XAttr> xAttrs;
> {code}
> Currently we use above in XAttrFeature, it's not efficient from memory point of view,
since {{ImmutableList}} and {{XAttr}} have object memory overhead, and each object has memory
> We can use a {{byte[]}} in XAttrFeature and do some compact in {{XAttr}}.

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