Refactor zstd decoder #498
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Clean up error returns to cancel when context is cancelled.
dnwe
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Dec 21, 2022
An upstream change in klauspost/compress#498 changed the default decoder concurrency from GOMAXPROCS to a maximum of 4. Explicitly pass a value of 0 via WithDecoderConcurrency so that GOMAXPROCS is used by default again.
dnwe
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to IBM/sarama
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Dec 21, 2022
An upstream change in klauspost/compress#498 changed the default decoder concurrency from GOMAXPROCS to a maximum of 4. Explicitly pass a value of 0 via WithDecoderConcurrency so that GOMAXPROCS is used by default again.
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TLDR;
Streams can now be decoded without goroutines using
WithDecoderConcurrency(1).WithDecoderConcurrency(4)is now default. If you need more concurrentDecodeAlloperations, useWithDecoderConcurrency(0).Goroutines exit when streams have finished reading (either error or EOF).
Designed and tested to be compatible, but test before committing upgrade.
Changes
Goroutines will now only be created on demand, and
WithDecoderConcurrency(1)is now strictly synchronized.Decompression will typically be about 2x faster when using multiple goroutines, and will prepare input for the upstream reader async to reads. This can lead to ~3x faster input in total than using no goroutines.
New default is now
WithDecoderConcurrency(4)(or less, if GOMAXPROCS is less). Beyond 4, there is little benefit for streaming decompression.WithDecoderConcurrency(1).Fixes #477