Reduce copying when creating scroll/PIT ids #99219
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These IDs can be pretty large at high shard counts. This commit removes an unnecessary copy while base64-encoding/decoding, specifies ISO_8859_1 so that the unavoidable copy operations work directly on the bytes, and also skips the temporary creation of an O(#shards)-sized map in favour of just writing the entries directly and then reading them into a map at the other end.
DaveCTurner
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Hi @DaveCTurner, I've created a changelog YAML for you. |
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Pinging @elastic/es-search (Team:Search) |
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original-brownbear
approved these changes
Sep 6, 2023
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LGTM, I wonder if this is hot enough to justify even more effort. We could go one step further here and avoid one more round of copying by using something like org.apache.commons.io.output.WriterOutputStream but might not be necessary, this is a nice improvement already thanks!
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I suspect fundamentally we should reconsider the whole concept of IDs that can grow to MiBs in size... |
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These IDs can be pretty large at high shard counts. This commit removes
an unnecessary copy while base64-encoding/decoding, specifies ISO_8859_1
so that the unavoidable copy operations work directly on the bytes, and
also skips the temporary creation of an O(#shards)-sized map in favour
of just writing the entries directly and then reading them into a map at
the other end.