Elastic Cluster Rejected Execution Exception

Elastic Stack Elasticsearch
1

Hi,

I have the following cluster configuration :

Master -3 node (4 cpu, 20 gb ram)
coordinating -3 node (16 cpu, 98 GB,)
data- 5 node (28 cpu, 48 RAM)

And thread pool configuration is following
thread_pool:

search:
size: 64
queue_size: 500
min_queue_size: 10
max_queue_size: 1000
auto_queue_frame_size: 2000
target_response_time: 1s
http.enabled: true

We have some complex queries and there are regular updates on around 25% of data on the cluster.

I have observed that after the concurrency of approx 19k rpm, the cluster starts to reject the requests. I expect the traffic to increase further.

Please tell me what configuration changes can help me so that no requests are rejected with this cluster configuration.

Thanks.

2

Have you identified what is limiting performance? Is it disk I/O on the data nodes? Long or frequent GC on data or coordinating nodes? Is CPU saturated on some nodes? Is networking proving to be a bottleneck?

How much data do you have in the cluster? How many indices and shards? What type of complex queries are you running? How do you perform these regular updates?

3

Hi I am attaching the disk I/O stats as well as GC Logs Below:

Co-ordinating nodeData Node

Networking is not a bottleneck as what i found.

I have around 120GB of data with 6 indices out of which 1 is major with around 110GB of data which is queried frequently. All indices have 5 shards. Partial Updates are done throughout the day on the largest index.

CPU reaches upto 85% when load is high.

Sample Complex Query :
Sample Query

4

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