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https://issues.apache.org/jira/browse/HDDS-16704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Soldatov updated HDDS-16704:
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Status: Patch Available (was: Open)
> ReadBlock fails with IllegalStateException when a response is shorter than
> responseDataSize
> -------------------------------------------------------------------------------------------
>
> Key: HDDS-16704
> URL: https://issues.apache.org/jira/browse/HDDS-16704
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Datanode
> Affects Versions: 2.2.1
> Reporter: Sergey Soldatov
> Assignee: Sergey Soldatov
> Priority: Major
> Labels: pull-request-available
>
> Regression from HDDS-15857. KeyValueHandler.readBlockImpl uses
> ReadBlockComputation to compute a checksum-aligned buffer limit per response.
> ReadBlockComputation.computeBufferLimit() calls findChunk(offset +
> responseDataSize) to locate the chunk at the end of the window, which
> advances the forward-only cursor (lastPosition) to offset + responseDataSize.
> After the response is sent, readBlockImpl calls findChunk(adjustedOffset)
> with the offset actually reached. Whenever that response was shorter than
> responseDataSize (an unaligned chunk boundary inside the window, i.e.
> variable-sized chunks after hsync, or a short file read), the new position is
> below lastPosition and Preconditions.assertTrue(position >= lastPosition)
> throws IllegalStateException. The ReadBlock fails on all replicas.
> Example: chunks [1024, 20, 4096], bytesPerChecksum=1024,
> responseDataSize=2048, read 0..5140: the first limit is 1044, then
> findChunk(1044) fails against lastPosition=2048.
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