[HDFS-8793] Improve BlockManager memory and performance - ASF JIRA

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Umbrella JIRA to improve BlockManager memory and performance.

1.	BlockManager#postponedMisreplicatedBlocks should use a LightWeightHashSet to save memory	Resolved	Yi Liu	Actions
2.	Improve CorruptReplicasMap#corruptReplicasMap	Resolved	Yi Liu	Actions
3.	Improve InvalidateBlocks#node2blocks	Resolved	Yi Liu	Actions
4.	BlockManager#excessReplicateMap should use a HashMap	Resolved	Yi Liu	Actions
5.	Implement ShrinkableHashMap extends java HashMap and use properly	Resolved	Yi Liu	Actions