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<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Hi,<span></span></p>
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<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">I’m investing a problem where I get delays in requests that is proxied to an upstream service.<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">By looking at the debug log it seems that one request is blocking the worker so it can’t complete another requests.<span></span></span></p>
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<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">If you look at the log below request *352 is handled by worker 18728. This worker then starts to process request *360 but for reason it is blocked at 13:53:53 until 13:54:03. How can that happen ?<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">The upstream service for request *360 doesn’t send any data in the time interval 13:53:53-15:54:03.<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">But the upstream service for request *352 responses nearly immediately.<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">(I have examined the communication between nginx and the upstream in wireshark)<span></span></span></p>
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<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Another observation, in the time interval 13:53:53-15:54:03 the worker process seems to be in state D (uninterruptible sleep)<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">So my question is: What can block worker 18728 so it doesn’t complete request *352<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">OS: Redhat 7.4<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Nginx: 1.12.2<span></span></p>
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<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Hopefully I have provided enough details.<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Thanks in advance<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"> Lars<span></span></span></p>
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<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
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<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">---------------- nginx debug error log ---------------------------------------------------------------------<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 input buf #95517<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 pipe temp offset: 588029952<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 input buf #95518<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 readv: eof:0, avail:1<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 pipe offset: 368738304<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 readv: 2, last:4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 pipe buf ls:1 0000556CF522BAF0, pos 0000556CF522BAF0, size: 4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 pipe buf ls:1 0000556CF5233250, pos 0000556CF5233250, size: 4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 pipe recv chain: 8192<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 pipe buf ls:1 0000556CF522EB20, pos 0000556CF522EB20, size: 4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 input buf #144060<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 size: 8192<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 input buf #144061<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 writev: 22, 8192, 368738304<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 pipe offset: 588029952<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 pipe buf ls:1 0000556CF5220480, pos 0000556CF5220480, size: 4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 pipe buf ls:1 0000556CF5233250, pos 0000556CF5233250, size: 4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 pipe temp offset: 368746496<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 pipe buf ls:1 0000556CF522CAF0, pos 0000556CF522CAF0, size: 4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *352 writev: 418 of 418<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:40 [debug] 18726#0: *249 readv: eof:0, avail:1<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 size: 8192<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *352 chain writer out: 0000000000000000<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">2018/03/09 13:53:40 [debug] 18726#0: *249 readv: 2, last:4096<span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">2018/03/09 13:53:53 [debug] 18729#0: *352 event timer del: 14: 1520603638051<span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:32 [debug] 18728#0: *189 writev: 18, 8192, 588029952<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *352 event timer add: 14: 86400000:1520690033051<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">----------- lines removed ------------------------------------------<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *360 pipe buf in s:1 t:1 f:0 0000556CF5232240, pos 0000556CF5232240, size: 4096 file: 0, size: 0<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *360 pipe buf free s:0 t:1 f:0 0000556CF5236280, pos 0000556CF5236280, size: 75 file: 0, size: 0<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *360 pipe length: -1<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *360 event timer: 18, old: 1520690033267, new: 1520690033348<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *360 event timer add: 16: 86400000:1520690033348<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *360 http upstream request: "/download_stream/<a href="http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad57-18ad8">http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad57-18ad8</a><span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">18bc29f.pcap?"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:53:53 [debug] 18729#0: *360 http upstream dummy handler<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 http upstream request: "/download_stream/<a href="http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad57-18ad8">http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad57-18ad8</a><span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">18bc29f.pcap?"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 http upstream process upstream<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 pipe read upstream: 1<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 readv: eof:1, avail:1<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">----------- lines removed ------------------------------------------<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"><span> </span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 SSL_write: -1<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 SSL_get_error: 3<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 http write filter 0000556CF5235600<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 http copy filter: -2 "/download_stream/<a href="http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad57-18ad818">http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad57-18ad818</a><span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">bc29f.pcap?"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 http writer output filter: -2, "/download_stream/<a href="http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad">http://127.0.0.1:46766/5ad8c4fe-c9a5-4d3e-ad</a><span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">57-18ad818bc29f.pcap?"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *360 event timer: 16, old: 1520690043209, new: 1520690043209<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http upstream request: "/1/search/74dc9b3c-dd89-11e6-9b3b-0894ef39879c/99fbbec6-a6f5-4f42-82f<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">6-5cc2f9651f45?"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http upstream process header<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 malloc: 0000556CF524C2D0:4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 recv: eof:1, avail:1<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 recv: fd:14 278 of 4096<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy status 200 "200 OK"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy header: "Syncuuid: 5304cf38-1cd8-11e6-bddc-0894ef1af70f"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy header: "Content-Length: 78"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy header: "Syncmagic: 3"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy header: "Content-Type: application/json"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy header: "Server: Pandion/7.3.3-3933"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy header: "Transfer-Encoding: chunked"<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 http proxy header done<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">2018/03/09 13:54:03 [debug] 18729#0: *352 HTTP/1.1 200 OK<span></span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Date: Fri, 09 Mar 2018 13:54:03 GMT<span></span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Content-Type: application/json<span></span></p>
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