[Dataflow Streaming] replace OutputStreamWriter with custom ByteStringAppendable in encodeKey #33735
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…gAppendable OutputStreamWriter is thread safe and has synchronization overhead. Each OutputStreamWriter allocates a 512 byte buffer which is useful when writing inmemory ByteStrings.
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R: @scwhittle |
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arunpandianp
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OutputStreamWriter is thread safe and has synchronization overhead. Each OutputStreamWriter allocates a 512 byte buffer which is not useful when writing in-memory ByteStrings.
The buffer allocations show up starkly on cpu profiles.
#33578