elasticsearch understand thread pool

Kaushik

Thread Pool Reference (Official)

I have a few questions about the above references

  1. For search requests: how many threads are needed if my index has 2 shards
  2. For batch/write requests: how many threads are needed if my index has 2 shards
  3. Do write and search requests have dedicated threads? That is, the number of search requests does not affect the write thread/thread queue
  4. If a thread is writing to 'Index_1', will a lock be created on the index? If I have parallel search requests to the same index, does it have to wait until the write is done?
Elasticsearch Ninja

inline answer

1. For search requests: If my index has 2 shards, how many threads will it require ?

ES creates a separate thread for each primary shard.

2. Batch/Write Requests: How many threads will be needed if my index has 2 shards

same as the first answer

3. Are there dedicated threads for write and search requests? That is, the number of search requests does not affect the write thread/thread queue

Yes, they have their own thread pool. The search pool is used for counting/searching/suggesting operations. Write a thread pool for single-document index/delete/update and batch requests. More info on the same official link in the question.

Helpful opster blog at https://opster.com/elasticsearch-glossary/elasticsearch-search-latency-burst-of-search-traffic-guide/

From the above blog, it answers your first and second questions.

ES creates a separate thread to query each shard, and a separate fixed-size thread pool for search queries

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