Sergey Soldatov created HDDS-14752:
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Summary: Performance degradation in stream GET due to delayed
semaphore/permit release at block EOF
Key: HDDS-14752
URL: https://issues.apache.org/jira/browse/HDDS-14752
Project: Apache Ozone
Issue Type: Bug
Components: Ozone Client
Affects Versions: 2.2.0
Reporter: Sergey Soldatov
Assignee: Sergey Soldatov
Fix For: 2.2.0
Stream GET/read workloads slow down because we hold the stream-read permit for
too long. When a block hits EOF, the permit (released by
{{{}completeStreamRead{}}}) isn’t freed right away. That means other readers
get stuck waiting even though the block is already done, so queues build up,
throughput drops, and latency gets worse. In my tests I see performance
degradation 2-3x times for the regular client and over 10x on s3gateway for
files with size over several gb.
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