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Posted to hdfs-dev@hadoop.apache.org by "Yi Liu (JIRA)" <ji...@apache.org> on 2015/08/17 07:54:45 UTC

[jira] [Created] (HDFS-8900) Improve XAttr memory footprint.

Yi Liu created HDFS-8900:
----------------------------

             Summary: Improve XAttr 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


{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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