Use single Selector and small thread pool to replace many instances of
BlockSender for reads
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Key: HDFS-918
URL: https://issues.apache.org/jira/browse/HDFS-918
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Reporter: Jay Booth
Fix For: 0.22.0
Currently, on read requests, the DataXCeiver server allocates a new thread per
request, which must allocate its own buffers and leads to higher-than-optimal
CPU and memory usage by the sending threads. If we had a single selector and a
small threadpool to multiplex request packets, we could theoretically achieve
higher performance while taking up fewer resources and leaving more CPU on
datanodes available for mapred, hbase or whatever. This can be done without
changing any wire protocols.
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