Convert DFSInputStream synchronized sections to a ReadWrite lock
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Key: HDFS-1605
URL: https://issues.apache.org/jira/browse/HDFS-1605
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client
Reporter: dhruba borthakur
Assignee: dhruba borthakur
Hbase does concurrent preads from multiple threads to different blocks of the
same hdfs file. Each of these pread calls invoke DFSInputStream.getFileLength()
and DFSInputStream.getBlockAt(). These methods are "synchronized", thus causing
all the concurrent threads to serialize. It would help performance to convert
this to a Read/Write lock
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