# Cluster not responding to status requests

**URL:** <https://discuss.elastic.co/t/cluster-not-responding-to-status-requests/8843>\
**Category:** Elasticsearch\
**Created:** [August 24, 2012, 7:45am UTC](https://discuss.elastic.co/t/cluster-not-responding-to-status-requests/8843 "2012-08-24T07:45:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Andrej](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@Andrej](https://discuss.elastic.co/u/Andrej)\
**Post date:** [August 24, 2012, 7:45am UTC](https://discuss.elastic.co/t/cluster-not-responding-to-status-requests/8843/1 "2012-08-24T07:45:10Z")

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Hi,

I am experiencing a very strange behavoir at the moment. I have an  
eight-node cluster, cluster is up and running (status green), I can send  
search request and get responses, I can ask for cluster health and cluster  
state, and thats it. I dont get any answer on cluster nodes, stats,  
segments, nothing, no response.  
Last thing I did was writing 5m docs in two indices, that worked fine.  
Does anyone ever experienced something similar? Any hints what to do to get  
the cluster back responding (apart from restart)? Any idea what could be  
the reason for this?

Thanks in advance!  
Andrej

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**Author:** ![Andrej](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@Andrej](https://discuss.elastic.co/u/Andrej)\
**Post date:** [August 29, 2012, 1:39pm UTC](https://discuss.elastic.co/t/cluster-not-responding-to-status-requests/8843/2 "2012-08-29T13:39:23Z")

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Ok, after this seemed to be reproducable I looked around a bit more in  
several log files, it seems that something brought an optimization process  
to halt (on one node), blocking further optimizations. So whenever I try to  
optimize an index I will get the following exception and can not retrieve  
stats anymore:

[2012-08-27 17:45:21,680][DEBUG][action.admin.indices.optimize] [Pulse]  
[xxxxxx][14], node[xxxxx], [R], s[STARTED]: Failed to execute  
[org.elasticsearch.action.admin.indices.optimize.OptimizeRequest@1d40c0cf]  
org.elasticsearch.transport.RemoteTransportException:  
[Butterball][inet[/x.x.x.x:xxxx]][indices/optimize/s]  
Caused by: org.elasticsearch.index.engine.FlushNotAllowedEngineException:  
[xxxxx][14] Already flushing...

Maybe someone can tell me if there is a connection between the optimize  
problem and the "no stats" problem?

Thanks!  
Andrej

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 3:14am UTC](https://discuss.elastic.co/t/cluster-not-responding-to-status-requests/8843/3 "2017-07-06T03:14:45Z")

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Closed on July 6, 2017, 3:14am UTC