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}}. -- This message was sent by Atlassian JIRA (v6.3.4#6332)