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I was reading about relocation of shards in elastic search and allocation of unassigned shards. Came upon this issue - https://github.com/elastic/elasticsearch/issues/12273.

Here it is mentioned that since unassigned shards are present in the cluster relocation is not possible.. I couldn't comprehend the reason behind it.

I tried reading about procedures to reallocate shards when unassigned shards are present. There are some deadlock issues when we put hard limit on the total number shards on a node, but I feel they can be addressed if relocation happens.

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  • When you have an allocation issue, the first thing to do to understand why is to call GET _cluster/allocation/explain. Can you update your question with the full result you get from that call? Commented Jun 30, 2023 at 11:23
  • I know the reason of my shards being unassigned.. I am researching on how does allocation of unassigned shards takes place. Commented Jun 30, 2023 at 11:29
  • If you know why and the problem has been resolved, you can simply run POST _cluster/reroute?retry_failed=true and the unassigned shards will start being allocated Commented Jun 30, 2023 at 11:31
  • How does the allocation takes place is what I want to know, What you told doesn't answers my question. Commented Jun 30, 2023 at 12:06
  • It's automatic, ES decides what to allocate where based on multiple rules. Allocation rules are described here elastic.co/guide/en/elasticsearch/reference/current/… Commented Jun 30, 2023 at 12:21
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