Geoserver users,
I'm running into an odd situation, where when I run a cache seeding
job, one of the threads hangs at -1 tiles completed. It looks like one of
the GWC seeder threads gets stuck in a bad state, but still ends up back in
the thread pool. Then, when another cache seed job picks up, that bad
thread picks up some work but just sits there without processing any tiles.
A thread in a poor state looks like the below one. Has anyone seen
this issue before, and did you have a resolution? The issue appears to be
tied to upgrading to larger hardware, so it could have to do with more
opportunities for concurrency issues. We are running Tomcat 6 and Oracle
Java 1.6.0_35
Best,
Erek
"GWC Seeder Thread-4" prio=10 tid=0x00007f0ab84bb800 nid=0xaf3 waiting on
condition [0x00007f0ae688e000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000c5dbc8d0> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)
at
java.util.concurrent.ArrayBlockingQueue.put(ArrayBlockingQueue.java:257)
at
org.geotools.renderer.lite.StreamingRenderer.paint(StreamingRenderer.java:825)
at
org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap(RenderedImageMapOutputFormat.java:490)
at
org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap(RenderedImageMapOutputFormat.java:254)
at
org.geoserver.wms.map.RenderedImageMapOutputFormat.produceMap(RenderedImageMapOutputFormat.java:126)
at org.geoserver.wms.GetMap.executeInternal(GetMap.java:471)
at org.geoserver.wms.GetMap.run(GetMap.java:208)
at org.geoserver.wms.GetMap.run(GetMap.java:112)
at
org.geoserver.wms.DefaultWebMapService.getMap(DefaultWebMapService.java:353)
at sun.reflect.GeneratedMethodAccessor237.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at
org.geoserver.gwc.wms.CacheSeedingWebMapService.invoke(CacheSeedingWebMapService.java:61)
at
org.geoserver.gwc.wms.CacheSeedingWebMapService.invoke(CacheSeedingWebMapService.java:35)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at
org.geoserver.gwc.wms.CachingWebMapService.invoke(CachingWebMapService.java:69)
at
org.geoserver.gwc.wms.CachingWebMapService.invoke(CachingWebMapService.java:50)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at
org.geoserver.ows.util.RequestObjectLogger.invoke(RequestObjectLogger.java:54)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy30.getMap(Unknown Source)
at sun.reflect.GeneratedMethodAccessor189.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.geoserver.ows.Dispatcher.execute(Dispatcher.java:772)
at
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:272)
at
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
at org.geoserver.gwc.GWC.dispatchOwsRequest(GWC.java:1037)
at
org.geoserver.gwc.layer.GeoServerTileLayer.dispatchGetMap(GeoServerTileLayer.java:523)
at
org.geoserver.gwc.layer.GeoServerTileLayer.getMetatilingReponse(GeoServerTileLayer.java:498)
- locked <0x00000000c5dc3b90> (a org.geowebcache.layer.GridLocObj)
at
org.geoserver.gwc.layer.GeoServerTileLayer.seedTile(GeoServerTileLayer.java:662)
at org.geowebcache.seed.SeedTask.doActionInternal(SeedTask.java:129)
at org.geowebcache.seed.GWCTask.doAction(GWCTask.java:76)
at org.geowebcache.seed.MTSeeder.call(MTSeeder.java:36)
at org.geowebcache.seed.MTSeeder.call(MTSeeder.java:25)
at
java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
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