ElasticSearch (4) cluster -- sharding test
cluster setting
shards : 5
replica : 0
There are 3 ES nodes.
NODE_1 master
NODE_2
NODE_3
After some indices are completed, using the segment api we can see that there are 5 primary active shards.
NODE_1 (master) shard1, shard2
NODE_2 shard3
NODE_3 shard4, shard5
Then master node service is shutdown(kill process directly), using the segment api we can see that there are 3 primary active shards.
NODE_2 (master) shard3
NODE_3 shard4, shard5
Then bring back the NODE_1, using the segment api we can see that there are 5 primary active shards.
NODE_1 shard1, shard2
NODE_2 (master) shard3
NODE_3 shard4, shard5
It means the index segments can be brought back after the ES service is back.
But with replica 0 , is it possible to copy the sharding to other nodes?
Even using the shutdown service rest api, the shard is not available after node is shutdown.
Wrapper service is necesary to use if you want to restart the ES service using rest api.
Every time a node is restarted, the node id changes.
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