Hi Yiannis,

those messages mean that there were some corrupt GELF messages received by 
your GELF UDP input. This can have many causes, like corrupt UDP packets on 
the network, sudden connection drops (which also lead to corrupt UDP 
packets), or simply a broken GELF client.

Cheers,
Jochen

On Wednesday, 6 July 2016 23:04:46 UTC+2, Yiannis wrote:
>
> Hi all,
> my graylog server every now and then throws the following error
>
> 2016-07-06T18:16:31.634Z ERROR [DecodingProcessor] Error processing 
> message RawMessage{id=c3e09906-43a5-11e6-8d92-14feb5dac0e1, 
> journalOffset=8155803, codec=gelf, payloadSize=2473, 
> timestamp=2016-07-06T18:16:31.632Z}
> java.util.zip.ZipException: invalid distance too far back
>         at 
> java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164) 
> ~[?:1.8.0_91]
>         at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:117) 
> ~[?:1.8.0_91]
>         at java.io.FilterInputStream.read(FilterInputStream.java:107) 
> ~[?:1.8.0_91]
>         at com.google.common.io.ByteStreams.copy(ByteStreams.java:110) 
> ~[graylog.jar:?]
>         at 
> com.google.common.io.ByteStreams.toByteArray(ByteStreams.java:168) 
> ~[graylog.jar:?]
>         at org.graylog2.plugin.Tools.decompressGzip(Tools.java:202) 
> ~[graylog.jar:?]
>         at 
> org.graylog2.inputs.codecs.gelf.GELFMessage.getJSON(GELFMessage.java:57) 
> ~[graylog.jar:?]
>         at org.graylog2.inputs.codecs.GelfCodec.decode(GelfCodec.java:110) 
> ~[graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.DecodingProcessor.processMessage(DecodingProcessor.java:136)
>  
> ~[graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.DecodingProcessor.onEvent(DecodingProcessor.java:82)
>  
> [graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.ProcessBufferProcessor.onEvent(ProcessBufferProcessor.java:58)
>  
> [graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.ProcessBufferProcessor.onEvent(ProcessBufferProcessor.java:35)
>  
> [graylog.jar:?]
>         at com.lmax.disruptor.WorkProcessor.run(WorkProcessor.java:139) 
> [graylog.jar:?]
>         at 
> com.codahale.metrics.InstrumentedThreadFactory$InstrumentedRunnable.run(InstrumentedThreadFactory.java:66)
>  
> [graylog.jar:?]
>         at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
>
> 2016-07-06T20:22:57.544Z ERROR [DecodingProcessor] Error processing 
> message RawMessage{id=6d6dfe20-43b7-11e6-9c4f-14feb5dade21, 
> journalOffset=13128278, codec=gelf, payloadSize=1659, 
> timestamp=2016-07-06T20:22:57.538Z}
> java.util.zip.ZipException: invalid distance too far back
>         at 
> java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164) 
> ~[?:1.8.0_91]
>         at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:117) 
> ~[?:1.8.0_91]
>         at java.io.FilterInputStream.read(FilterInputStream.java:107) 
> ~[?:1.8.0_91]
>         at com.google.common.io.ByteStreams.copy(ByteStreams.java:110) 
> ~[graylog.jar:?]
>         at 
> com.google.common.io.ByteStreams.toByteArray(ByteStreams.java:168) 
> ~[graylog.jar:?]
>         at org.graylog2.plugin.Tools.decompressGzip(Tools.java:202) 
> ~[graylog.jar:?]
>         at 
> org.graylog2.inputs.codecs.gelf.GELFMessage.getJSON(GELFMessage.java:57) 
> ~[graylog.jar:?]
>         at org.graylog2.inputs.codecs.GelfCodec.decode(GelfCodec.java:110) 
> ~[graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.DecodingProcessor.processMessage(DecodingProcessor.java:136)
>  
> ~[graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.DecodingProcessor.onEvent(DecodingProcessor.java:82)
>  
> [graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.ProcessBufferProcessor.onEvent(ProcessBufferProcessor.java:58)
>  
> [graylog.jar:?]
>         at 
> org.graylog2.shared.buffers.processors.ProcessBufferProcessor.onEvent(ProcessBufferProcessor.java:35)
>  
> [graylog.jar:?]
>         at com.lmax.disruptor.WorkProcessor.run(WorkProcessor.java:139) 
> [graylog.jar:?]
>         at 
> com.codahale.metrics.InstrumentedThreadFactory$InstrumentedRunnable.run(InstrumentedThreadFactory.java:66)
>  
> [graylog.jar:?]
>         at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
>
> Could someone explain what is going wrong.
>
> Regards
> Yiannis
>
>

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