Hey Tristan

Yes we did restart graylog2-server. In fact we stopped it, deleted the 
files in /var/lib/graylog2-server/message-cache-spool/* and then started it 
again.
Still getting these exceptions..

On Wednesday, December 10, 2014 6:10:45 PM UTC+1, Tristan Rhodes wrote:
>
> Sandro,
>
> We had these same errors on version 0.92, but after reading the release 
> notes for 0.92.1 I disabled the output buffer and then restarted 
> graylog2.  
>
> disable_output_cache = true
>
> Now I don't get the messages anymore!  
>
> Did you restart the graylog2 service after disabling the output cache?
>
> sudo service graylog2-server restart
>
> Cheers!
>
> Tristan
>
>
>
> On Wed, Dec 10, 2014 at 6:06 AM, Sandro Roth <[email protected] 
> <javascript:>> wrote:
>
>> We are seeing the same issue. Deleted buffer files and disabled output 
>> buffer, but that didn't help..
>> Let's hope they fixed this in 0.92.1
>>
>>
>> On Monday, December 8, 2014 2:12:10 PM UTC+1, Razvan Grigore wrote:
>>>
>>> We have the same problem, after updating to 0.92, some at startup:
>>>
>>> 2014-12-08T13:54:55.590+01:00 ERROR [MasterCacheWorkerThread] Error 
>>> while trying to work on MasterCache <org.graylog2.caches.
>>> DiskJournalCache.Output>.
>>> java.lang.NullPointerException
>>>         at org.mapdb.Queues$SimpleQueue.peek(Queues.java:117)
>>>         at org.mapdb.Queues$SimpleQueue.isEmpty(Queues.java:287)
>>>         at org.graylog2.caches.DiskJournalCache.isEmpty(
>>> DiskJournalCache.java:238)
>>>         at org.graylog2.periodical.MasterCacheWorkerThread.work(
>>> MasterCacheWorkerThread.java:106)
>>>         at org.graylog2.periodical.MasterCacheWorkerThread.access$200(
>>> MasterCacheWorkerThread.java:43)
>>>         at org.graylog2.periodical.MasterCacheWorkerThread$2.run(
>>> MasterCacheWorkerThread.java:87)
>>>         at java.lang.Thread.run(Thread.java:745)
>>> 2014-12-08T13:54:57.101+01:00 ERROR [AbstractCacheWorkerThread] 
>>> Exception while working on cache:
>>> java.lang.NullPointerException
>>>         at org.mapdb.Queues$SimpleQueue.poll(Queues.java:135)
>>>         at org.mapdb.Queues$SimpleQueue.drainTo(Queues.java:271)
>>>         at org.graylog2.caches.DiskJournalCache.drainTo(
>>> DiskJournalCache.java:207)
>>>         at org.graylog2.periodical.AbstractCacheWorkerThread.
>>> drainMessagesEnqueue(AbstractCacheWorkerThread.java:79)
>>>         at org.graylog2.periodical.AbstractCacheWorkerThread.work(
>>> AbstractCacheWorkerThread.java:58)
>>>         at org.graylog2.periodical.OutputCacheWorkerThread$1.run(
>>> OutputCacheWorkerThread.java:60)
>>>         at java.lang.Thread.run(Thread.java:745)
>>>
>>> ... but also a shorter one all the time, each few seconds:
>>>
>>>
>>> 2014-12-08T13:56:47.912+01:00 ERROR [MasterCacheWorkerThread] Error 
>>> while trying to work on MasterCache <org.graylog2.caches.
>>> DiskJournalCache.Output>.
>>> java.lang.NullPointerException
>>> 2014-12-08T13:56:57.332+01:00 ERROR [MasterCacheWorkerThread] Error 
>>> while trying to work on MasterCache <org.graylog2.caches.
>>> DiskJournalCache.Output>.
>>> java.lang.NullPointerException
>>> 2014-12-08T13:57:17.003+01:00 ERROR [AbstractCacheWorkerThread] 
>>> Exception while working on cache:
>>> java.lang.NullPointerException
>>>
>>> I already tried to delete the contents of that folder and restart the 
>>> graylog-server, but still the same.
>>>
>>> Razvan
>>>
>>>
>>> On Tuesday, December 2, 2014 11:44:53 AM UTC+1, Jochen Schalanda wrote:
>>>>
>>>> Hi Martin,
>>>>
>>>> please try deleting the files in your message_cache_spool_dir (see 
>>>> graylog2.conf).
>>>>
>>>>
>>>> Cheers,
>>>> Jochen
>>>>
>>>> On Tuesday, 2 December 2014 10:16:38 UTC+1, Martin René Mortensen wrote:
>>>>>
>>>>>  After upgrading to 0.92 Im having troubles with 
>>>>> java.lang.NullPointerException in GL2 server logs. I have 3 graylog2 
>>>>> servers all reporting the same errors periodically.
>>>>>
>>>>> I'm getting these when starting:
>>>>>
>>>>> 2014-12-01T14:09:33.416+01:00 INFO  [node] [node2] initialized
>>>>> 2014-12-01T14:09:33.685+01:00 INFO  [DiskJournalCache] Compacting 
>>>>> off-heap message cache database files (output-cache)
>>>>> 2014-12-01T14:09:36.913+01:00 INFO  [OutputBuffer] Initialized 
>>>>> OutputBuffer with ring size <8192> and wait strategy 
>>>>> <BlockingWaitStrategy>.
>>>>> 2014-12-01T14:09:36.982+01:00 INFO  [Main] Graylog2 Server 0.92.0 
>>>>> (c1fe236) starting up. (JRE: Oracle Corporation 1.7.0_72 on Linux 
>>>>> 3.10.0-123.9.3.el7.x86_64)
>>>>> 2014-12-01T14:09:37.034+01:00 INFO  [PeriodicalsService] Starting 17 
>>>>> periodicals ...
>>>>> 2014-12-01T14:09:37.038+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.TelemetryReporterThread] periodical. Not 
>>>>> configured to run on this node.
>>>>> 2014-12-01T14:09:37.038+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.StreamThroughputCounterManagerThread] 
>>>>> periodical in [0s], polling every [1s].
>>>>> 2014-12-01T14:09:37.039+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.InputCacheWorkerThread] periodical, running 
>>>>> forever.
>>>>> 2014-12-01T14:09:37.039+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.IndexerClusterCheckerThread] periodical. 
>>>>> Only started on graylog2-server master nodes.
>>>>> 2014-12-01T14:09:37.039+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.ClusterHealthCheckThread] periodical. Only 
>>>>> started on graylog2-server master nodes.
>>>>> 2014-12-01T14:09:37.039+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.ContentPackLoaderPeriodical] periodical. 
>>>>> Only started on graylog2-server master nodes.
>>>>> 2014-12-01T14:09:37.039+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.AlertScannerThread] periodical. Only started 
>>>>> on graylog2-server master nodes.
>>>>> 2014-12-01T14:09:37.040+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.BatchedElasticSearchOutputFlushThread] 
>>>>> periodical in [0s], polling every [5s].
>>>>> 2014-12-01T14:09:37.040+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.GarbageCollectionWarningThread] periodical, 
>>>>> running forever.
>>>>> 2014-12-01T14:09:37.041+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.IndexRotationThread] periodical. Only 
>>>>> started on graylog2-server master nodes.
>>>>> 2014-12-01T14:09:37.041+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.ThroughputCounterManagerThread] periodical 
>>>>> in [0s], polling every [1s].
>>>>> 2014-12-01T14:09:37.042+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.MasterCacheWorkerThread] periodical, running 
>>>>> forever.
>>>>> 2014-12-01T14:09:37.043+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.DeadLetterThread] periodical, running 
>>>>> forever.
>>>>> 2014-12-01T14:09:37.044+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.VersionCheckThread] periodical. Only started 
>>>>> on graylog2-server master nodes.
>>>>> 2014-12-01T14:09:37.044+01:00 INFO  [PeriodicalsService] Not starting 
>>>>> [org.graylog2.periodical.IndexRetentionThread] periodical. Only 
>>>>> started on graylog2-server master nodes.
>>>>> 2014-12-01T14:09:37.044+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.OutputCacheWorkerThread] periodical, running 
>>>>> forever.
>>>>> 2014-12-01T14:09:37.044+01:00 INFO  [Periodicals] Starting 
>>>>> [org.graylog2.periodical.NodePingThread] periodical in [0s], polling 
>>>>> every [1s].
>>>>> 2014-12-01T14:09:37.050+01:00 INFO  [node] [node2] starting ...
>>>>> 2014-12-01T14:09:37.270+01:00 INFO  [transport] [node2] bound_address 
>>>>> {inet[/0:0:0:0:0:0:0:0:9350]}, publish_address {inet[/1.1.1.107:9350]}
>>>>> 2014-12-01T14:09:37.279+01:00 ERROR [MasterCacheWorkerThread] Error 
>>>>> while trying to work on MasterCache <org.graylog2.caches.
>>>>> DiskJournalCache.Output>.
>>>>> java.lang.NullPointerException
>>>>>         at org.mapdb.Queues$SimpleQueue.peek(Queues.java:117)
>>>>>         at org.mapdb.Queues$SimpleQueue.isEmpty(Queues.java:287)
>>>>>         at org.graylog2.caches.DiskJournalCache.isEmpty(
>>>>> DiskJournalCache.java:238)
>>>>>         at org.graylog2.periodical.MasterCacheWorkerThread.work(
>>>>> MasterCacheWorkerThread.java:102)
>>>>>         at org.graylog2.periodical.MasterCacheWorkerThread.access$200(
>>>>> MasterCacheWorkerThread.java:43)
>>>>>         at org.graylog2.periodical.MasterCacheWorkerThread$2.run(
>>>>> MasterCacheWorkerThread.java:87)
>>>>>         at java.lang.Thread.run(Thread.java:745)
>>>>> 2014-12-01T14:09:37.305+01:00 INFO  [discovery] [node2] 
>>>>> spocklog/zvu6TQifTVe0eBV_h9NU0A
>>>>> 2014-12-01T14:09:38.497+01:00 ERROR [MasterCacheWorkerThread] Error 
>>>>> while trying to work on MasterCache <org.graylog2.caches.
>>>>> DiskJournalCache.Output>.
>>>>> java.lang.NullPointerException
>>>>>         at org.mapdb.Queues$SimpleQueue.peek(Queues.java:117)
>>>>>         at org.mapdb.Queues$SimpleQueue.isEmpty(Queues.java:287)
>>>>>         at org.graylog2.caches.DiskJournalCache.isEmpty(
>>>>> DiskJournalCache.java:238)
>>>>>         at org.graylog2.periodical.MasterCacheWorkerThread.work(
>>>>> MasterCacheWorkerThread.java:102)
>>>>>         at org.graylog2.periodical.MasterCacheWorkerThread.access$200(
>>>>> MasterCacheWorkerThread.java:43)
>>>>>         at org.graylog2.periodical.MasterCacheWorkerThread$2.run(
>>>>> MasterCacheWorkerThread.java:87)
>>>>>         at java.lang.Thread.run(Thread.java:745)
>>>>> 2014-12-01T14:09:38.763+01:00 INFO  [KieRepositoryImpl] KieModule was 
>>>>> added:MemoryKieModule[ ReleaseId=org.graylog2:dynamic-rules:0]
>>>>> 2014-12-01T14:09:38.852+01:00 INFO  [KieRepositoryImpl] Adding 
>>>>> KieModule from resource :[ByteArrayResource resource=[B@5da78d54]
>>>>> 2014-12-01T14:09:38.961+01:00 INFO  [KieRepositoryImpl] KieModule was 
>>>>> added:MemoryKieModule[ ReleaseId=org.graylog2:dynamic-rules:0]
>>>>> 2014-12-01T14:09:39.475+01:00 WARN  [BatchedElasticSearchOutput] 
>>>>> Clearing buffer (5000 messages) because the Elasticsearch cluster is down.
>>>>> 2014-12-01T14:09:40.179+01:00 WARN  [BatchedElasticSearchOutput] 
>>>>> Clearing buffer (5000 messages) because the Elasticsearch cluster is down.
>>>>> 2014-12-01T14:09:40.313+01:00 WARN  [discovery] [node2] waited for 3s 
>>>>> and no initial state was set by the discovery
>>>>> 2014-12-01T14:09:40.315+01:00 INFO  [node] [node2] started
>>>>>
>>>>>  -- 
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>
>
>
> -- 
> Tristan Rhodes
>  

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