Rebalance is Not Working In Elasticsearch

Elastic Stack Elasticsearch
1

Hi Team,

I had below scenario in my Elasticsearch setup.
The cluster previously consists of 2 nodes and one index having docs around 125M.
I had added one more node to the cluster but the data is not getting distributed uniformly across three nodes.
So I just want to know is rebalance will happen automatically or we need to trigger manually and how to check the progress of this rebalance activity.

Thanks,
Debasis

2

How many primary and replica shards do you have in the cluster?

Are all nodes running exactly the same vesion?

3

@Christian_Dahlqvist Thanks for response. Please find the below response to your questions.

How many primary and replica shards do you have in the cluster?
Ans:- It is the default setting while creating Index (Primary shard 1 and replica 1).
Are all nodes running exactly the same version?.
Ans: Yes (8.9.x).

Thanks,
Debasis

4

Elasticsearch balances data at the shard level. If you only have one index with one primary and one replica shard, those 2 shards can only be spread across 2 nodes.

5

Thanks @Christian_Dahlqvist for response. Can you please helps me to understand below two points.

  1. If I increase the shard count then the rebalance process will happen automatically or we need to trigger manually.
  2. Could you please share me any blog or doc link which I can follow and perform the rebalance.
  3. Is there anyway to monitor the progress of rebalance process from Kibana dashboard.

Thanks,
Debasis

6

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