[HDFS-2533] Remove needless synchronization on FSDataSet.getBlockFile

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.23.0
• Fix Version/s: 0.23.1, 1.2.0
• Component/s: datanode, performance
• Target Version/s: 0.23.1
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 02/Nov/11 20:44
• Updated: 10/Mar/15 02:26
• Resolved: 03/Nov/11 01:00

Description

HDFS-1148 discusses lock contention issues in FSDataset. It provides a more comprehensive fix, converting it all to RWLocks, etc. This JIRA is for one very specific fix which gives a decent performance improvement for TestParallelRead: getBlockFile() currently holds the lock which is completely unnecessary.