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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8900) Compact XAttrs to optimize memory footprint.
Date Fri, 28 Aug 2015 03:04:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14717979#comment-14717979
] 

Hudson commented on HDFS-8900:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #8362 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/8362/])
HDFS-8963. Fix incorrect sign extension of xattr length in HDFS-8900. (Colin Patrick McCabe
via yliu) (yliu: rev e166c038c0aaa57b245f985a1c0fadd5fe33c384)
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestXAttrFeature.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/XAttrFormat.java


> 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
>             Fix For: 2.8.0
>
>         Attachments: HDFS-8900.001.patch, HDFS-8900.002.patch, HDFS-8900.003.patch, HDFS-8900.004.patch,
HDFS-8900.005.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
alignment. 
> We can use a {{byte[]}} in XAttrFeature and do some compact in {{XAttr}}.



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