Yi Liu created HDFS-8988:
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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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