Sammi Chen created HDDS-12919:
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Summary: Remove FileLock from ChunkWrite
Key: HDDS-12919
URL: https://issues.apache.org/jira/browse/HDDS-12919
Project: Apache Ozone
Issue Type: Improvement
Reporter: Sammi Chen
Assignee: Sammi Chen
Currently before chunk read and write, it will acquire a read or write lock
from fileStripedLock in ChunkUtils, so that read and write are welly controlled
in Datanode.
For chunk write, it further acquires an exclusive FileLock after acquire the
write lock from fileStripedLock. As the FileLock mainly acts as inter-process
lock purpose, to prevent another process from reading or writing to the same
lock region, which is not a case in Ozone, there are no other processes which
will read/write the same block file as Datanode. So acquire this exclusive
FileLock after already holding the write lock from fileStripedLock is not
necessary.
This task aims to remove the FileLock acquire for chunk write.
BTW, it took ~2ms to acquire a FileLock, ~0.15ms to acquire a LOCK from
fileStripedLock.
And FileLock doesn't prevent file get deleted by another thread.
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