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Add notes for 2018-01-29
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@ -1174,3 +1174,68 @@ $ ./jmeter -n -t ~/dspace-performance-test/DSpacePerfTest-dspacetest.cgiar.org.j
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- It reduces the start up time of Catalina by using multiple threads to start web applications in parallel
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- It reduces the start up time of Catalina by using multiple threads to start web applications in parallel
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- On my local test machine the startup time went from 70 to 30 seconds
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- On my local test machine the startup time went from 70 to 30 seconds
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- See: https://tomcat.apache.org/tomcat-7.0-doc/config/host.html
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- See: https://tomcat.apache.org/tomcat-7.0-doc/config/host.html
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## 2018-01-29
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- CGSpace went down this morning for a few minutes, according to UptimeRobot
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- Looking at the DSpace logs I see this error happened just before UptimeRobot noticed it going down:
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```
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2018-01-29 05:30:22,226 INFO org.dspace.usage.LoggerUsageEventListener @ anonymous:session_id=3775D4125D28EF0C691B08345D905141:ip_addr=68.180.229.254:view_item:handle=10568/71890
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2018-01-29 05:30:22,322 ERROR org.dspace.app.xmlui.aspect.discovery.AbstractSearch @ org.apache.solr.search.SyntaxError: Cannot parse 'dateIssued_keyword:[1994+TO+1999]': Encountered " "]" "] "" at line 1, column 32.
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Was expecting one of:
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"TO" ...
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<RANGE_QUOTED> ...
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<RANGE_GOOP> ...
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org.dspace.discovery.SearchServiceException: org.apache.solr.search.SyntaxError: Cannot parse 'dateIssued_keyword:[1994+TO+1999]': Encountered " "]" "] "" at line 1, column 32.
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Was expecting one of:
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"TO" ...
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<RANGE_QUOTED> ...
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<RANGE_GOOP> ...
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```
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- So is this an error caused by this particular client (which happens to be `Yahoo! Slurp`)?
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- I see a few dozen HTTP 499 errors in the nginx access log for a few minutes before this happened, but HTTP 499 is just when nginx says that the client closed the request early
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- Perhaps this from the nginx error log is relevant?
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```
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2018/01/29 05:26:34 [warn] 26895#26895: *944759 an upstream response is buffered to a temporary file /var/cache/nginx/proxy_temp/6/16/0000026166 while reading upstream, client: 180.76.15.34, server: cgspace.cgiar.org, request: "GET /bitstream/handle/10947/4658/FISH%20Leaflet.pdf?sequence=12 HTTP/1.1", upstream: "http://127.0.0.1:8443/bitstream/handle/10947/4658/FISH%20Leaflet.pdf?sequence=12", host: "cgspace.cgiar.org"
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```
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- I think that must be unrelated, probably the client closed the request to nginx because DSpace (Tomcat) was taking too long
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- An interesting [snippet to get the maximum and average nginx responses](https://gist.github.com/magnetikonline/11312172):
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```
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# awk '($9 ~ /200/) { i++;sum+=$10;max=$10>max?$10:max; } END { printf("Maximum: %d\nAverage: %d\n",max,i?sum/i:0); }' /var/log/nginx/access.log
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Maximum: 2771268
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Average: 210483
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```
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- I guess responses that don't fit in RAM get saved to disk (a default of 1024M), so this is definitely not the issue here, and that warning is totally unrelated
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- My best guess is that the Solr search error is related somehow but I can't figure it out
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- We definitely have enough database connections, as I haven't seen a pool error in weeks:
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```
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$ grep -c "Timeout: Pool empty." dspace.log.2018-01-2*
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dspace.log.2018-01-20:0
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dspace.log.2018-01-21:0
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dspace.log.2018-01-22:0
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dspace.log.2018-01-23:0
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dspace.log.2018-01-24:0
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dspace.log.2018-01-25:0
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dspace.log.2018-01-26:0
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dspace.log.2018-01-27:0
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dspace.log.2018-01-28:0
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dspace.log.2018-01-29:0
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```
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- Adam Hunt from WLE complained that pages take "1-2 minutes" to load each, from France and Sri Lanka
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- I asked him which particular pages, as right now pages load in 2 or 3 seconds for me
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- UptimeRobot said CGSpace went down again, and I looked at PostgreSQL and saw 211 active database connections
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- If it's not memory and it's not database, it's gotta be Tomcat threads...?
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- I decided to change the Tomcat thread settings on CGSpace:
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- `maxThreads` from 200 (default) to 400
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- `processorCache` from 200 (default) to 400, [recommended to be the same as `maxThreads`](https://tomcat.apache.org/tomcat-7.0-doc/config/http.html)
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- `minSpareThreads` from 10 (default) to 20
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- `acceptorThreadCount` from 1 (default) to 2, [recommended to be 2 on multi-CPU systems](https://tomcat.apache.org/tomcat-7.0-doc/config/http.html)
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@ -92,7 +92,7 @@ Danny wrote to ask for help renewing the wildcard ilri.org certificate and I adv
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<meta property="article:published_time" content="2018-01-02T08:35:54-08:00"/>
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<meta property="article:published_time" content="2018-01-02T08:35:54-08:00"/>
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<meta property="article:modified_time" content="2018-01-28T12:49:00+02:00"/>
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<meta property="article:modified_time" content="2018-01-28T18:34:24+02:00"/>
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@ -194,9 +194,9 @@ Danny wrote to ask for help renewing the wildcard ilri.org certificate and I adv
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"@type": "BlogPosting",
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"@type": "BlogPosting",
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"headline": "January, 2018",
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"headline": "January, 2018",
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"url": "https://alanorth.github.io/cgspace-notes/2018-01/",
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"url": "https://alanorth.github.io/cgspace-notes/2018-01/",
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"wordCount": "6793",
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"wordCount": "7218",
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"datePublished": "2018-01-02T08:35:54-08:00",
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"datePublished": "2018-01-02T08:35:54-08:00",
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"dateModified": "2018-01-28T12:49:00+02:00",
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"dateModified": "2018-01-28T18:34:24+02:00",
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"author": {
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"author": {
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"@type": "Person",
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"@type": "Person",
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"name": "Alan Orth"
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"name": "Alan Orth"
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@ -1560,6 +1560,80 @@ $ ./jmeter -n -t ~/dspace-performance-test/DSpacePerfTest-dspacetest.cgiar.org.j
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<li>See: <a href="https://tomcat.apache.org/tomcat-7.0-doc/config/host.html">https://tomcat.apache.org/tomcat-7.0-doc/config/host.html</a></li>
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<li>See: <a href="https://tomcat.apache.org/tomcat-7.0-doc/config/host.html">https://tomcat.apache.org/tomcat-7.0-doc/config/host.html</a></li>
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</ul>
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</ul>
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<h2 id="2018-01-29">2018-01-29</h2>
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<ul>
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<li>CGSpace went down this morning for a few minutes, according to UptimeRobot</li>
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<li>Looking at the DSpace logs I see this error happened just before UptimeRobot noticed it going down:</li>
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</ul>
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<pre><code>2018-01-29 05:30:22,226 INFO org.dspace.usage.LoggerUsageEventListener @ anonymous:session_id=3775D4125D28EF0C691B08345D905141:ip_addr=68.180.229.254:view_item:handle=10568/71890
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2018-01-29 05:30:22,322 ERROR org.dspace.app.xmlui.aspect.discovery.AbstractSearch @ org.apache.solr.search.SyntaxError: Cannot parse 'dateIssued_keyword:[1994+TO+1999]': Encountered " "]" "] "" at line 1, column 32.
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Was expecting one of:
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"TO" ...
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<RANGE_QUOTED> ...
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<RANGE_GOOP> ...
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org.dspace.discovery.SearchServiceException: org.apache.solr.search.SyntaxError: Cannot parse 'dateIssued_keyword:[1994+TO+1999]': Encountered " "]" "] "" at line 1, column 32.
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Was expecting one of:
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"TO" ...
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<RANGE_QUOTED> ...
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<RANGE_GOOP> ...
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</code></pre>
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<ul>
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<li>So is this an error caused by this particular client (which happens to be <code>Yahoo! Slurp</code>)?</li>
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<li>I see a few dozen HTTP 499 errors in the nginx access log for a few minutes before this happened, but HTTP 499 is just when nginx says that the client closed the request early</li>
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<li>Perhaps this from the nginx error log is relevant?</li>
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</ul>
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<pre><code>2018/01/29 05:26:34 [warn] 26895#26895: *944759 an upstream response is buffered to a temporary file /var/cache/nginx/proxy_temp/6/16/0000026166 while reading upstream, client: 180.76.15.34, server: cgspace.cgiar.org, request: "GET /bitstream/handle/10947/4658/FISH%20Leaflet.pdf?sequence=12 HTTP/1.1", upstream: "http://127.0.0.1:8443/bitstream/handle/10947/4658/FISH%20Leaflet.pdf?sequence=12", host: "cgspace.cgiar.org"
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</code></pre>
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<ul>
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<li>I think that must be unrelated, probably the client closed the request to nginx because DSpace (Tomcat) was taking too long</li>
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<li>An interesting <a href="https://gist.github.com/magnetikonline/11312172">snippet to get the maximum and average nginx responses</a>:</li>
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</ul>
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<pre><code># awk '($9 ~ /200/) { i++;sum+=$10;max=$10>max?$10:max; } END { printf("Maximum: %d\nAverage: %d\n",max,i?sum/i:0); }' /var/log/nginx/access.log
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Maximum: 2771268
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Average: 210483
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</code></pre>
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<ul>
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<li>I guess responses that don’t fit in RAM get saved to disk (a default of 1024M), so this is definitely not the issue here, and that warning is totally unrelated</li>
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<li>My best guess is that the Solr search error is related somehow but I can’t figure it out</li>
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<li>We definitely have enough database connections, as I haven’t seen a pool error in weeks:</li>
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</ul>
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<pre><code>$ grep -c "Timeout: Pool empty." dspace.log.2018-01-2*
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dspace.log.2018-01-20:0
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dspace.log.2018-01-21:0
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dspace.log.2018-01-22:0
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dspace.log.2018-01-23:0
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dspace.log.2018-01-24:0
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dspace.log.2018-01-25:0
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dspace.log.2018-01-26:0
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dspace.log.2018-01-27:0
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dspace.log.2018-01-28:0
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dspace.log.2018-01-29:0
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</code></pre>
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<ul>
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<li>Adam Hunt from WLE complained that pages take “1-2 minutes” to load each, from France and Sri Lanka</li>
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<li>I asked him which particular pages, as right now pages load in 2 or 3 seconds for me</li>
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<li>UptimeRobot said CGSpace went down again, and I looked at PostgreSQL and saw 211 active database connections</li>
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<li>If it’s not memory and it’s not database, it’s gotta be Tomcat threads…?</li>
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<li>I decided to change the Tomcat thread settings on CGSpace:
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<ul>
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<li><code>maxThreads</code> from 200 (default) to 400</li>
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<li><code>processorCache</code> from 200 (default) to 400, <a href="https://tomcat.apache.org/tomcat-7.0-doc/config/http.html">recommended to be the same as <code>maxThreads</code></a></li>
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<li><code>minSpareThreads</code> from 10 (default) to 20</li>
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<li><code>acceptorThreadCount</code> from 1 (default) to 2, <a href="https://tomcat.apache.org/tomcat-7.0-doc/config/http.html">recommended to be 2 on multi-CPU systems</a></li>
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</ul></li>
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</ul>
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@ -4,7 +4,7 @@
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<url>
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/2018-01/</loc>
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<loc>https://alanorth.github.io/cgspace-notes/2018-01/</loc>
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<lastmod>2018-01-28T12:49:00+02:00</lastmod>
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<lastmod>2018-01-28T18:34:24+02:00</lastmod>
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</url>
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</url>
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<url>
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<url>
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@ -144,7 +144,7 @@
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<url>
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/</loc>
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<loc>https://alanorth.github.io/cgspace-notes/</loc>
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<lastmod>2018-01-28T12:49:00+02:00</lastmod>
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<lastmod>2018-01-28T18:34:24+02:00</lastmod>
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<priority>0</priority>
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<priority>0</priority>
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</url>
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</url>
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<url>
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/tags/notes/</loc>
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<loc>https://alanorth.github.io/cgspace-notes/tags/notes/</loc>
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<lastmod>2018-01-28T12:49:00+02:00</lastmod>
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<lastmod>2018-01-28T18:34:24+02:00</lastmod>
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<priority>0</priority>
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<priority>0</priority>
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</url>
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</url>
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@ -167,13 +167,13 @@
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<url>
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/post/</loc>
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<loc>https://alanorth.github.io/cgspace-notes/post/</loc>
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<lastmod>2018-01-28T12:49:00+02:00</lastmod>
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<lastmod>2018-01-28T18:34:24+02:00</lastmod>
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<priority>0</priority>
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<priority>0</priority>
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</url>
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</url>
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<url>
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/tags/</loc>
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<loc>https://alanorth.github.io/cgspace-notes/tags/</loc>
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<lastmod>2018-01-28T12:49:00+02:00</lastmod>
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<lastmod>2018-01-28T18:34:24+02:00</lastmod>
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<priority>0</priority>
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<priority>0</priority>
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</url>
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</url>
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