Increasing the heap size on ES and Graylog respectively fixed the issue. 

On Friday, July 8, 2016 at 11:07:46 AM UTC-5, Ariel Godinez wrote:
>
> After further investigation I think this was due to elasticsearch and 
> graylog being overloaded. I have increased their heap sizes accordingly and 
> will see how the system performs.
>
> Ariel
>
> On Wednesday, July 6, 2016 at 12:21:11 PM UTC-5, Ariel Godinez wrote:
>>
>> Hello,
>>
>> I've been using graylog for a couple weeks now and started to notice some 
>> unusual behavior today. I am currently running a single node setup.
>>
>> The Issue:
>>
>> Every once in awhile I start to notice that that graylog is dragging 
>> quite a bit (the loading spinner is persisting much longer than usual) so I 
>> go check the logs and find the following error message. 
>>
>> ERROR [ServerRuntime$Responder] An I/O error has occurred while writing a 
>> response message entity to the container output stream.
>> org.glassfish.jersey.server.internal.process.MappableException: 
>> java.io.IOException: Connection closed
>>         at 
>> org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:92)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:711)
>>  
>> [graylog.jar:?]
>>         at 
>> org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:444)
>>  
>> [graylog.jar:?]
>>         at 
>> org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:434)
>>  
>> [graylog.jar:?]
>>         at 
>> org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:329) 
>> [graylog.jar:?]
>>         at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) 
>> [graylog.jar:?]
>>         at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) 
>> [graylog.jar:?]
>>         at org.glassfish.jersey.internal.Errors.process(Errors.java:315) 
>> [graylog.jar:?]
>>         at org.glassfish.jersey.internal.Errors.process(Errors.java:297) 
>> [graylog.jar:?]
>>         at org.glassfish.jersey.internal.Errors.process(Errors.java:267) 
>> [graylog.jar:?]
>>         at 
>> org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
>>  
>> [graylog.jar:?]
>>         at 
>> org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) 
>> [graylog.jar:?]
>>         at 
>> org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
>>  
>> [graylog.jar:?]
>>         at 
>> org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:384)
>>  
>> [graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:224) 
>> [graylog.jar:?]
>>         at 
>> com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)
>>  
>> [graylog.jar:?]
>>         at 
>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>>  
>> [?:1.8.0_91]
>>         at 
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>  
>> [?:1.8.0_91]
>>         at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
>> Caused by: java.io.IOException: Connection closed
>>         at 
>> org.glassfish.grizzly.asyncqueue.TaskQueue.onClose(TaskQueue.java:317) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.AbstractNIOAsyncQueueWriter.onClose(AbstractNIOAsyncQueueWriter.java:501)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOTransport.closeConnection(TCPNIOTransport.java:412)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.NIOConnection.doClose(NIOConnection.java:604) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.NIOConnection$5.run(NIOConnection.java:570) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.DefaultSelectorHandler.execute(DefaultSelectorHandler.java:235)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.NIOConnection.terminate0(NIOConnection.java:564) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOConnection.terminate0(TCPNIOConnection.java:291)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOAsyncQueueWriter.writeCompositeRecord(TCPNIOAsyncQueueWriter.java:197)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOAsyncQueueWriter.write0(TCPNIOAsyncQueueWriter.java:92)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.AbstractNIOAsyncQueueWriter.processAsync(AbstractNIOAsyncQueueWriter.java:344)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:107)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.strategies.SameThreadIOStrategy.executeIoEvent(SameThreadIOStrategy.java:103)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.strategies.AbstractIOStrategy.executeIoEvent(AbstractIOStrategy.java:89)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.iterateKeyEvents(SelectorRunner.java:415)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.iterateKeys(SelectorRunner.java:384)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.doSelect(SelectorRunner.java:348) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.run(SelectorRunner.java:279) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
>>  
>> ~[graylog.jar:?]
>>         ... 1 more
>> Caused by: java.io.IOException: Broken pipe
>>         at sun.nio.ch.FileDispatcherImpl.write0(Native Method) 
>> ~[?:1.8.0_91]
>>         at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) 
>> ~[?:1.8.0_91]
>>         at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93) 
>> ~[?:1.8.0_91]
>>         at sun.nio.ch.IOUtil.write(IOUtil.java:51) ~[?:1.8.0_91]
>>         at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471) 
>> ~[?:1.8.0_91]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOUtils.flushByteBuffer(TCPNIOUtils.java:149)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOAsyncQueueWriter.writeCompositeRecord(TCPNIOAsyncQueueWriter.java:187)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOAsyncQueueWriter.write0(TCPNIOAsyncQueueWriter.java:92)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.AbstractNIOAsyncQueueWriter.processAsync(AbstractNIOAsyncQueueWriter.java:344)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:107)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.strategies.SameThreadIOStrategy.executeIoEvent(SameThreadIOStrategy.java:103)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.strategies.AbstractIOStrategy.executeIoEvent(AbstractIOStrategy.java:89)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.iterateKeyEvents(SelectorRunner.java:415)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.iterateKeys(SelectorRunner.java:384)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.doSelect(SelectorRunner.java:348) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.nio.SelectorRunner.run(SelectorRunner.java:279) 
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
>>  
>> ~[graylog.jar:?]
>>         at 
>> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
>>  
>> ~[graylog.jar:?]
>>         ... 1 more
>>
>> At times I get a notification in the graylog web interface in conjunction 
>> with this error even though my *is_master = true *is indeed set  :
>>
>> *There was no master Graylog server node detected in the 
>> cluster. (triggered a few seconds ago)*
>> *Certain operations of Graylog server require the presence of a master 
>> node, but no such master was started. Please ensure that one of your 
>> Graylog server nodes contains the setting is_master = true in its 
>> configuration and that it is running. Until this is resolved index cycling 
>> will not be able to run, which means that the index retention mechanism is 
>> also not running, leading to increased index sizes. Certain maintenance 
>> functions as well as a variety of web interface pages (e.g. Dashboards) are 
>> unavailable.*
>>
>> After a couple minutes the notification just disappears and I continue to 
>> use graylog as normal. My thinking is that there is a communication issue 
>> somewhere along the tech stack. If anyone has any thoughts as to what might 
>> be causing the issue or where else I could look for error logs to further 
>> investigate please let me know. Thanks for your time.
>>
>> Regards,
>> Ariel
>>
>>

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