Cluster round-robin scheduler loses request #3551
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cluster
Issues and PRs related to the cluster subsystem.
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cc @bnoordhuis |
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I am able to reproduce this consistently |
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@alexeyten I think it should be fixed by da21dba in master, could you please verify? |
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I can still reproduce with master. I'll try to look into it next week. |
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Interestingly enough, today's master works fine. @alexeyten Can you confirm? |
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Okay, I take that back. It still happens, just infrequently. |
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@alexeyten Can you confirm that #3677 fixes the issue for you? |
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@bnoordhuis looks so. At least it handled 1M requests without problems. |
bnoordhuis
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Nov 6, 2015
Due to the race window between the master's "disconnect" message and the worker's "handle received" message, connections sometimes got stuck in the pending handles queue when calling `worker.disconnect()` in the master process. The observable effect from the client's perspective was a TCP or HTTP connection that simply stalled. This commit fixes that by closing open handles in the master when the "disconnect" message is sent. Fixes: nodejs#3551 PR-URL: nodejs#3677 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Fedor Indutny <fedor@indutny.com> Reviewed-By: James M Snell <jasnell@gmail.com>
bnoordhuis
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Nov 7, 2015
Due to the race window between the master's "disconnect" message and the worker's "handle received" message, connections sometimes got stuck in the pending handles queue when calling `worker.disconnect()` in the master process. The observable effect from the client's perspective was a TCP or HTTP connection that simply stalled. This commit fixes that by closing open handles in the master when the "disconnect" message is sent. Fixes: #3551 PR-URL: #3677 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Fedor Indutny <fedor@indutny.com> Reviewed-By: James M Snell <jasnell@gmail.com>
bnoordhuis
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Nov 30, 2015
Due to the race window between the master's "disconnect" message and the worker's "handle received" message, connections sometimes got stuck in the pending handles queue when calling `worker.disconnect()` in the master process. The observable effect from the client's perspective was a TCP or HTTP connection that simply stalled. This commit fixes that by closing open handles in the master when the "disconnect" message is sent. Fixes: #3551 PR-URL: #3677 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Fedor Indutny <fedor@indutny.com> Reviewed-By: James M Snell <jasnell@gmail.com>
bnoordhuis
added a commit
that referenced
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Dec 4, 2015
Due to the race window between the master's "disconnect" message and the worker's "handle received" message, connections sometimes got stuck in the pending handles queue when calling `worker.disconnect()` in the master process. The observable effect from the client's perspective was a TCP or HTTP connection that simply stalled. This commit fixes that by closing open handles in the master when the "disconnect" message is sent. Fixes: #3551 PR-URL: #3677 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Fedor Indutny <fedor@indutny.com> Reviewed-By: James M Snell <jasnell@gmail.com>
bnoordhuis
added a commit
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Dec 17, 2015
Due to the race window between the master's "disconnect" message and the worker's "handle received" message, connections sometimes got stuck in the pending handles queue when calling `worker.disconnect()` in the master process. The observable effect from the client's perspective was a TCP or HTTP connection that simply stalled. This commit fixes that by closing open handles in the master when the "disconnect" message is sent. Fixes: #3551 PR-URL: #3677 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Fedor Indutny <fedor@indutny.com> Reviewed-By: James M Snell <jasnell@gmail.com>
bnoordhuis
added a commit
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Dec 23, 2015
Due to the race window between the master's "disconnect" message and the worker's "handle received" message, connections sometimes got stuck in the pending handles queue when calling `worker.disconnect()` in the master process. The observable effect from the client's perspective was a TCP or HTTP connection that simply stalled. This commit fixes that by closing open handles in the master when the "disconnect" message is sent. Fixes: #3551 PR-URL: #3677 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Fedor Indutny <fedor@indutny.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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Example code is here: https://gist.github.com/alexeyten/45fb4319e4158feb793a
I've tested this code with Node.js 4.2.1
This server just response with
OKand restart workers after 200-300 completed requests. With default cluster scheduler (SCHED_RR) server eventually loses some requests andabstops with timeout error. When I uncomment line 5 and useSCHED_NONEscheduler, then server works fine./cc @indutny
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