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https://issues.apache.org/jira/browse/HDFS-8900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14715502#comment-14715502
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Haohui Mai commented on HDFS-8900:
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bq. The findbugs doesn't exist. (The existing findbugs were in pre-patch).
It appears that this jira introduces two new findbugs warnings in Jenkins.
https://builds.apache.org/job/PreCommit-HDFS-Build/12120/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
> 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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