A few optimizations to FsNamesystem#RecentInvalidateSets
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Key: HADOOP-5124
URL: https://issues.apache.org/jira/browse/HADOOP-5124
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.21.0
This jira proposes a few optimization to FsNamesystem#RecentInvalidateSets:
1. when removing all replicas of a block, it does not traverse all nodes in the
map. Instead it traverse only the nodes that the block is located.
2. When dispatching blocks to datanodes in ReplicationMonitor. It randomly
chooses a predefined number of datanodes and dispatches blocks to those
datanodes. This strategy provides fairness to all datanodes. The current
strategy always starts from the first datanode.
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