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Posted to hdfs-issues@hadoop.apache.org by "Yi Liu (JIRA)" <ji...@apache.org> on 2015/08/28 08:32:45 UTC

[jira] [Created] (HDFS-8988) Use LightWeightHashSet instead of LightWeightLinkedSet in BlockManager#excessReplicateMap

Yi Liu created HDFS-8988:
----------------------------

             Summary: Use LightWeightHashSet instead of LightWeightLinkedSet in BlockManager#excessReplicateMap
                 Key: HDFS-8988
                 URL: https://issues.apache.org/jira/browse/HDFS-8988
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Yi Liu
            Assignee: Yi Liu
            Priority: Minor


{code}
public final Map<String, LightWeightLinkedSet<Block>> excessReplicateMap = new HashMap<>();
{code}
{{LightWeightLinkedSet}} extends {{LightWeightHashSet}} and keeps elements in order, but it requires more memory for each entry (2 references, totally 8 bytes).  
We don't need to keep excess replicated blocks in order here, so should use  {{LightWeightHashSet}}.



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