Un block shards un assigned

Elastic Stack Elasticsearch
1

Hello all,

topology our cluster :

we use elasticsearch 6.2.2 OSS version

we have 7 node :

  • 1 master
  • 6 data node

Currently we have lost a node when we restart that we have a indice cannot assign 2 shards on 4 shards when we see with _cat/shards on reason we have that : UNASSIGNED DANGLING_INDEX_IMPORTED
when we reach on this shards we found also this tag no_valid_shard_copy

after some google search we try that https://medium.com/@remco_verhoef/when-everything-else-fails-cc8a27c679d0 but not works rerouting also not works.

Somebody can explain me how to analyse that and resolve that please ?

Regards

2

Chevalay,

Sorry to hear your node went down. Are all nodes back up at this point?

There is only one node in your cluster that is master eligible? Typically you want 3 master eligible nodes to help with resiliency and provide a necessary quorum to avoid split-brain.

I might take a look at the cluster allocation explain API which may help provide additional information. If you post your responses for those particular shards using the mentioned API it may be helpful.

3

Hi tdasch

in our config we precise that for data node

node.master: false
node.data : true

how to can 2 master node here to cause a split brain "split brains, the existence of two masters in a single cluster" : https://www.elastic.co/guide/en/elasticsearch/guide/1.x/_important_configuration_changes.html#_minimum_master_nodes

but good idea our cluster need more master to create quorum.

Regards

4

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