After restarting the web server and php service, I'm also seeing that the
mysql server is also stuck, at least partially:

mysql> show processlist;
+-------+------+------------------+---------+---------+-------+------------------------------+------------------------------------------------------------------------------------------------------+
| Id    | User | Host             | db      | Command | Time  | State
                 | Info
                                            |
+-------+------+------------------+---------+---------+-------+------------------------------+------------------------------------------------------------------------------------------------------+
| 23210 | root | web_server:57552 | ELGG_DB | Query   | 68861 | preparing
                 | SELECT DISTINCT rv.* FROM elgg_river rv  JOIN
elgg_entities oe ON rv.object_guid = oe.guid  LEFT JOI |
| 23212 | root | web_server:57564 | ELGG_DB | Query   | 68861 | Waiting for
table level lock | UPDATE elgg_entities SET last_action = 1472695283 WHERE
guid = 3906                                  |
| 23213 | root | web_server:57569 | ELGG_DB | Query   | 68860 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23214 | root | web_server:57573 | ELGG_DB | Query   | 68860 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23215 | root | web_server:57577 | ELGG_DB | Query   | 68859 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23216 | root | web_server:35492 | ELGG_DB | Query   |  6778 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23217 | root | web_server:35499 | ELGG_DB | Query   |  6740 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23218 | root | web_server:35528 | ELGG_DB | Query   |  6519 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23219 | root | web_server:35545 | ELGG_DB | Query   |  6390 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23220 | root | web_server:35611 | ELGG_DB | Query   |  5806 | Waiting for
table level lock | SELECT * from elgg_entities where guid=1 and ((access_id
IN (2)) AND (enabled = 'yes'))              |
| 23228 | root | localhost        | ELGG_DB | Query   |     0 | NULL
                  | show processlist
                                              |
+-------+------+------------------+---------+---------+-------+------------------------------+------------------------------------------------------------------------------------------------------+


mysql> SHOW FULL PROCESSLIST\G
*************************** 1. row ***************************
     Id: 23210
   User: root
   Host: web_server:57552
     db: ELGG_DB
Command: Query
   Time: 69347
  State: preparing
   Info: SELECT DISTINCT rv.* FROM elgg_river rv  JOIN elgg_entities oe ON
rv.object_guid = oe.guid  LEFT JOIN elgg_entities te ON rv.target_guid =
te.guid  WHERE  rv.enabled = 'yes' AND ((oe.access_id = -2
AND oe.owner_guid IN (
SELECT guid_one FROM elgg_entity_relationships
WHERE relationship = 'friend' AND guid_two = 138
) OR oe.owner_guid = 138 OR oe.access_id IN (2,1)) AND (oe.enabled =
'yes')) AND (((te.access_id = -2
AND te.owner_guid IN (
SELECT guid_one FROM elgg_entity_relationships
WHERE relationship = 'friend' AND guid_two = 138
) OR te.owner_guid = 138 OR te.access_id IN (2,1)) AND (te.enabled =
'yes')) OR te.guid IS NULL)  ORDER BY rv.posted desc LIMIT 0, 1

...




On Thu, Sep 1, 2016 at 1:03 AM, Judson Wilson <judsonwil...@google.com>
wrote:

> Actually I get 504 and 502 errors.
>
> Some interesting observation from the web_server container:
>
>
> # netstat -an | grep php
> unix  2      [ ACC ]     STREAM     LISTENING     1881200
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTED     2451425
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTED     2452484
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTED     2451393
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTED     2451377
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTED     2451421
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
> unix  2      [ ]         STREAM     CONNECTING    0
>  /var/run/php5-fpm.sock
>
> #cat /var/log/nginx/example_error.log
>
> ...
>
> 2016/09/01 02:02:32 [error] 63#0: *24729 connect() to 
> unix:/var/run/php5-fpm.sock failed (11: Resource temporarily unavailable) 
> while connecting to upstream, client: 192.168.1.3, server: localhost, 
> request: "POST /activity/proc/updateriver HTTP/1.1", upstream: 
> "fastcgi://unix:/var/run/php5-fpm.sock:", host: "192.168.1.2:8080", referrer: 
> "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:32 [error] 62#0: *23982 upstream timed out (110: Connection 
> timed out) while reading response header from upstream, client: 192.168.1.3, 
> server: localhost, request: "POST /action/wall/status HTTP/1.1", upstream: 
> "fastcgi://unix:/var/run/php5-fpm.sock", host: "192.168.1.2:8080", referrer: 
> "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:32 [error] 63#0: *24731 connect() to 
> unix:/var/run/php5-fpm.sock failed (11: Resource temporarily unavailable) 
> while connecting to upstream, client: 192.168.1.3, server: localhost, 
> request: "POST /activity/proc/updateriver HTTP/1.1", upstream: 
> "fastcgi://unix:/var/run/php5-fpm.sock:", host: "192.168.1.2:8080", referrer: 
> "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:32 [error] 63#0: *24225 upstream timed out (110: Connection 
> timed out) while reading response header from upstream, client: 192.168.1.3, 
> server: localhost, request: "POST /action/wall/status HTTP/1.1", upstream: 
> "fastcgi://unix:/var/run/php5-fpm.sock", host: "192.168.1.2:8080", referrer: 
> "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:32 [error] 63#0: *24733 connect() to 
> unix:/var/run/php5-fpm.sock failed (11: Resource temporarily unavailable) 
> while connecting to upstream, client: 192.168.1.3, server: localhost, 
> request: "GET 
> /action/elggchat/poll?__elgg_ts=1472695272&__elgg_token=c1050192db055187458f29ed8446bf42
>  HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: 
> "192.168.1.2:8080", referrer: "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:32 [error] 62#0: *23989 upstream timed out (110: Connection 
> timed out) while reading response header from upstream, client: 192.168.1.3, 
> server: localhost, request: "POST /action/wall/status HTTP/1.1", upstream: 
> "fastcgi://unix:/var/run/php5-fpm.sock", host: "192.168.1.2:8080", referrer: 
> "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:32 [error] 63#0: *24735 connect() to 
> unix:/var/run/php5-fpm.sock failed (11: Resource temporarily unavailable) 
> while connecting to upstream, client: 192.168.1.3, server: localhost, 
> request: "GET 
> /action/elggchat/poll?__elgg_ts=1472695262&__elgg_token=3f3ea2068dbdc3f245ebf64b5692102c
>  HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: 
> "192.168.1.2:8080", referrer: "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:33 [error] 63#0: *16609 upstream timed out (110: Connection 
> timed out) while reading response header from upstream, client: 192.168.1.3, 
> server: localhost, request: "POST 
> /action/elggchat/post_message?__elgg_token=5040655c35fca8f965b3ddae170156e0&__elgg_ts=1472693532
>  HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: 
> "192.168.1.2:8080", referrer: "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:33 [error] 63#0: *24737 connect() to 
> unix:/var/run/php5-fpm.sock failed (11: Resource temporarily unavailable) 
> while connecting to upstream, client: 192.168.1.3, server: localhost, 
> request: "POST /activity/proc/updateriver HTTP/1.1", upstream: 
> "fastcgi://unix:/var/run/php5-fpm.sock:", host: "192.168.1.2:8080", referrer: 
> "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:33 [error] 62#0: *22548 upstream timed out (110: Connection 
> timed out) while reading response header from upstream, client: 192.168.1.3, 
> server: localhost, request: "POST 
> /action/elggchat/post_message?__elgg_token=d4a749e5c6e13f92494c8e9edbe4768f&__elgg_ts=1472693124
>  HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: 
> "192.168.1.2:8080", referrer: "http://192.168.1.2:8080/activity";
> 2016/09/01 02:02:33 [error] 63#0: *24739 connect() to 
> unix:/var/run/php5-fpm.sock failed (11: Resource temporarily unavailable) 
> while connecting to upstream, client: 192.168.1.3, server: localhost, 
> request: "GET 
> /action/elggchat/poll?__elgg_ts=1472693124&__elgg_token=d4a749e5c6e13f92494c8e9edbe4768f
>  HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: 
> "192.168.1.2:8080", referrer: "http://192.168.1.2:8080/activity";
>
> ...
>
> On Wed, Aug 31, 2016 at 11:44 PM, Judson Wilson <judsonwil...@google.com>
> wrote:
>
>> Regarding the CloudSuite Web Serving benchmark, has anyone experienced the 
>> web server returning 504 error responses, or have any idea why this may be 
>> happening and how to fix it?
>>
>> I have modified the Faban driver to run longer, and so far all of 3 long 
>> tests (30 minutes or longer) have eventually degraded to the point where all 
>> responses are 504 messages.
>>
>> Here is an example from Faban's driver.log file:
>>
>> Sep 01, 2016 2:02:29 AM com.sun.faban.driver.engine.AgentThread logError
>> WARNING: ElggDriverAgent[0].59.sendChatMessage: Server returned HTTP 
>> response code: 504 for URL: 
>> http://192.168.1.2:8080/action/elggchat/post_message?__elgg_token=57e9c8b81e4cdffb712221df75561baf&__elgg_ts=1472694493
>> java.io.IOException: Server returned HTTP response code: 504 for URL: 
>> http://192.168.1.2:8080/action/elggchat/post_message?__elgg_token=57e9c8b81e4cdffb712221df75561baf&__elgg_ts=1472694493
>>         at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown 
>> Source)
>>         at 
>> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>>         at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
>>         at 
>> sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1677)
>>         at 
>> sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1675)
>>         at java.security.AccessController.doPrivileged(Native Method)
>>         at 
>> sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1673)
>>         at 
>> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1246)
>>         at 
>> com.sun.faban.driver.transport.sunhttp.SunHttpTransport.fetchResponse(SunHttpTransport.java:673)
>>         at 
>> com.sun.faban.driver.transport.sunhttp.SunHttpTransport.fetchURL(SunHttpTransport.java:557)
>>         at 
>> com.sun.faban.driver.transport.sunhttp.SunHttpTransport.fetchURL(SunHttpTransport.java:519)
>>         at workload.driver.Web20Driver.sendChatMessage(Web20Driver.java:638)
>>         at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
>>         at 
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>         at java.lang.reflect.Method.invoke(Method.java:606)
>>         at 
>> com.sun.faban.driver.engine.TimeThreadWithBackground.doRun(TimeThreadWithBackground.java:197)
>>         at com.sun.faban.driver.engine.AgentThread.run(AgentThread.java:202)
>> Caused by: java.io.IOException: Server returned HTTP response code: 504 for 
>> URL: 
>> http://192.168.1.2:8080/action/elggchat/post_message?__elgg_token=57e9c8b81e4cdffb712221df75561baf&__elgg_ts=1472694493
>>         at 
>> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1628)
>>         at 
>> java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
>>         at 
>> com.sun.faban.driver.transport.sunhttp.SunHttpTransport.fetchResponse(SunHttpTransport.java:654)
>>         ... 8 more
>>
>>
>

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