弹性搜索数据访问是同步还是异步？

Question

As i am new to elastic search.how will elasticsearch work in concurrency.How search work and write/update/delete work in one node.Every request is processed one by one or it wil work simutaneously.

 will it support transaction ??

Thanks in advance..!

Answer 1

CRUD requests happen in parallel within a single shard (you can have multiple shards on a single node). Transactions are not supported.

A bulk request (multiple CRUD requests in a single request) and processed serially on a single shard, but you can have multiple bulk requests processed in parallel on a single shard. They don't support transactions either. The success or failure of one request within a bulk request doesn't affect the others.

To ensure that one update doesn't overwrite changes from another, Elasticsearch provides optimistic concurrency control: you specify the version number of the doc you want to update. If the current version is different, then the update will fail and you can take the appropriate action.

See versioning and the retry_on_conflict parameter on the update API .