Todd Lipcon created HDFS-3767:
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Summary: Finer grained locking in DN
Key: HDFS-3767
URL: https://issues.apache.org/jira/browse/HDFS-3767
Project: Hadoop HDFS
Issue Type: Improvement
Components: performance
Affects Versions: 3.0.0
Reporter: Todd Lipcon
In testing a high-write-throughput workload, I see the DN maintain good
performance most of the time, except that occasionally one thread will block
for a few seconds in {{finalizeReplica}}. It does so holding the FSDatasetImpl
lock, which causes all other writer threads to block behind it. HDFS-1148
(making it a rw lock) would help here, but a bigger help would be to go do
finer-grained locking (eg per block or per-subdir).
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