HDDS-14752. Performance degradation in stream GET due to delayed semaphore/permit release at block EOF#9946
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ss77892 wants to merge 2 commits intoapache:masterfrom
Open
HDDS-14752. Performance degradation in stream GET due to delayed semaphore/permit release at block EOF#9946ss77892 wants to merge 2 commits intoapache:masterfrom
ss77892 wants to merge 2 commits intoapache:masterfrom
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…phore/permit release at block EOF
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@szetszwo can you take a look? |
szetszwo
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Mar 23, 2026
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szetszwo
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@ss77892 , thanks for working on this! Please see the comments inlined and below:
Performance degradation in stream GET ...
Questions on the title:
- Are you comparing two different versions? If not, let's remove "Performance degradation".
- What do you mean by "stream GET"?
How about updating the title to "Close stream immediately when position >= blockLength"?
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| private synchronized void maybeReleaseStreamOnEof() { | ||
| if (position >= blockLength && streamingReader != null) { |
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- The condition
streamingReader != nullseems not needed. - Combine maybeReleaseStreamOnEof() with
advancePosition(..).
private synchronized void advancePosition(long delta) {
position += delta;
if (position >= blockLength) {
closeStream();
}
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| private synchronized boolean dataAvailableToRead(int length, boolean preRead) throws IOException { | ||
| if (position >= blockLength) { | ||
| maybeReleaseStreamOnEof(); |
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Since position is only updated in advancePosition(..) but not here, we don't have to close stream here.
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What changes were proposed in this pull request?
HDDS-14752. Performance degradation in stream GET due to delayed semaphore/permit release at block EOF
Please describe your PR in detail:
This PR fixes a stream-read resource lifecycle issue in StreamBlockInputStream by releasing the stream permit immediately at block EOF, instead of relying on delayed cleanup paths. The read position advancement was
centralized and EOF release was made explicit to ensure consistent behavior across reads.
What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-14752
How was this patch tested?
UT has been added. Read cluster with 3 nodes performance evaluation.