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https://issues.apache.org/jira/browse/HDFS-8900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-8900:
------------------------------
Hadoop Flags: Incompatible change
Release Note: The config key "dfs.namenode.fs-limits.max-xattr-size" can no
longer be set to a value of 0 (previously used to indicate unlimited) or a
value greater than 32KB. This is a constraint on xattr size similar to many
local filesystems.
> 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 alignment.
> We can use a {{byte[]}} in XAttrFeature and do some compact in {{XAttr}}.
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