Ensure connection is usable after COPY stream is complete#1016
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valeneiko wants to merge 3 commits intoporsager:masterfrom
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Ensure connection is usable after COPY stream is complete#1016valeneiko wants to merge 3 commits intoporsager:masterfrom
valeneiko wants to merge 3 commits intoporsager:masterfrom
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Nice work! Looks good! You don't need the changes in the generated folders (cf, cjs, deno) so could you discard those changes? Also perhaps rebase on your latest PR that fixed CI |
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@porsager PR is updated and CI is green. |
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Is there anything holding back this fix? We are hit by this very often as well. 🙏 |
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@porsager, could you kindly provide an update on this PR? Is it still relevant or has the issue been fixed elsewhere? We have a number of users who are hit by this issue. |
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Summary
Encountered this issue in a live environment.
Sometimes random queries were hanging indefinitely after using a
COPYstream.This PR likely fixes:
Cause
This was caused by receiving
CopyDataandCopyDonemessages within the same chunk.If
CopyDatatriggers high water mark, handler pauses the socket, but still continues to process remaining messages, that were already received.If
CopyDoneis handled before stream managed to process buffered messages, the connection becomes unusable - the socket is paused. Any query using that connection will hang indefinitely (with response data in the socket read buffer).Fix
Make sure socket is flowing after
COPYstream is done.The test is a little complicated, but I couldn't find a simpler way to reliably reproduce the issue (now without the fix the test will timeout every time).