elasticsearch – what to do with unassigned shards

by

There are many possible reason why allocation won’t occur:

  1. You are running different versions of Elasticsearch on different nodes
  2. You only have one node in your cluster, but you have number of replicas set to something other than zero.
  3. You have insufficient disk space.
  4. You have shard allocation disabled.
  5. You have a firewall or SELinux enabled. With SELinux enabled but not configured properly, you will see shards stuck in INITIALIZING or RELOCATING forever.

As a general rule, you can troubleshoot things like this:

  1. Look at the nodes in your cluster: curl -s 'localhost:9200/_cat/nodes?v'. If you only have one node, you need to set number_of_replicas to 0. (See ES documentation or other answers).
  2. Look at the disk space available in your cluster: curl -s 'localhost:9200/_cat/allocation?v'
  3. Check cluster settings: curl 'http://localhost:9200/_cluster/settings?pretty' and look for cluster.routing settings
  4. Look at which shards are UNASSIGNED curl -s localhost:9200/_cat/shards?v | grep UNASS

  5. Try to force a shard to be assigned 

    curl -XPOST -d '{ "commands" : [ {
  "allocate" : {
       "index" : ".marvel-2014.05.21", 
       "shard" : 0, 
       "node" : "SOME_NODE_HERE",
       "allow_primary":true 
     } 
  } ] }' http://localhost:9200/_cluster/reroute?pretty

  6. Look at the response and see what it says. There will be a bunch of YES’s that are ok, and then a NO. If there aren’t any NO’s, it’s likely a firewall/SELinux problem.

More Related Contents:

  1. Elasticsearch replication of other system data?
  2. How to search for a part of a word with ElasticSearch
  3. no [query] registered for [filtered]
  4. elasticsearch bool query combine must with OR
  5. ElasticSearch – Return Unique Values
  6. Remove duplicate documents from a search in Elasticsearch
  7. Elasticsearch 2.1: Result window is too large (index.max_result_window)
  8. Max limit on the number of values I can specify in the ids filter or generally query clause?
  9. UTF8 encoding is longer than the max length 32766
  10. How to update multiple documents that match a query in elasticsearch
  11. Queries vs. Filters
  12. Why do I need “store”:”yes” in elasticsearch?
  13. Change default mapping of string to “not analyzed” in Elasticsearch
  14. How to not-analyze in ElasticSearch?
  15. Elasticsearch vs Cassandra vs Elasticsearch with Cassandra
  16. FIELDDATA Data is too large
  17. Find documents with empty string value on elasticsearch
  18. Elasticsearch, Tire, and Nested queries / associations with ActiveRecord
  19. ElasticSearch: Unassigned Shards, how to fix?
  20. low disk watermark [??%] exceeded on
  21. ElasticSearch – Get only matching nested objects with All Top level fields in search response
  22. Elasticsearch – set max_clause_count
  23. How to bind Elasticsearch 2.0 on both Loopback and Non-Loopback interfaces?
  24. ElasticSearch: aggregation on _score field?
  25. How to parse json in logstash /grok from a text file line?
  26. Logstash: Merge two logs into one output document
  27. Remove a field from a Elasticsearch document
  28. Elasticsearch error: cluster_block_exception [FORBIDDEN/12/index read-only / allow delete (api)], flood stage disk watermark exceeded
  29. What is the ElasticSearch equivalent for an SQL subquery?
  30. How to create multiple indexes in logstash.conf file?

Leave a Comment