---
id: 02f502e8-6482-11ee-8c99-0242ac120002
---

# High Number of Queued Threads in Elasticsearch Thread Pool
---

This incident type occurs when the number of queued threads in a thread pool in elasticsearch is higher than the acceptable limit. This may indicate that the thread pool is unable to handle the current workload, which can lead to performance issues and delays in processing requests. It is important to investigate and address this issue promptly to ensure optimal performance of the system.

### Parameters
```shell
export ELASTICSEARCH_HOST="PLACEHOLDER"

export DESIRED_THREAD_COUNT="PLACEHOLDER"

export THREAD_POOL_NAME="PLACEHOLDER"

export ELASTICSEARCH_CONFIG_PATH="PLACEHOLDER"
```

## Debug

### Check the number of queued threads in Elasticsearch
```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $5}'
```

### Check the number of available threads in Elasticsearch
```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $4}'
```

### Check the number of active threads in Elasticsearch
```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $3}'
```

### Check the number of rejected requests in Elasticsearch
```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $6}'
```

### Check the number of completed requests in Elasticsearch
```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $7}'
```

### Check the number of failed requests in Elasticsearch
```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $8}'
```

## Repair

### Increase the number of threads available in the thread pool in elasticsearch to avoid excessive queuing.
```shell


#!/bin/bash



# Set the number of threads to increase

NEW_THREAD_COUNT=${DESIRED_THREAD_COUNT}



# Set the Elasticsearch configuration file path

ELASTICSEARCH_CONFIG=${ELASTICSEARCH_CONFIG_PATH}



# Set the name of the thread pool to increase

THREAD_POOL_NAME=${THREAD_POOL_NAME}



# Update the thread pool configuration in the Elasticsearch configuration file

sed -i "s/\"$THREAD_POOL_NAME\" : {/\"$THREAD_POOL_NAME\" : {\n    \"size\" : $NEW_THREAD_COUNT,/g" $ELASTICSEARCH_CONFIG



# Restart Elasticsearch to apply the configuration changes

systemctl restart elasticsearch


```


This incident type occurs when the number of queued threads in a thread pool in elasticsearch is higher than the acceptable limit. This may indicate that the thread pool is unable to handle the current workload, which can lead to performance issues and delays in processing requests. It is important to investigate and address this issue promptly to ensure optimal performance of the system.


```shell
export ELASTICSEARCH_HOST="PLACEHOLDER"

export DESIRED_THREAD_COUNT="PLACEHOLDER"

export THREAD_POOL_NAME="PLACEHOLDER"

export ELASTICSEARCH_CONFIG_PATH="PLACEHOLDER"
```


### Check the number of queued threads in Elasticsearch

```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $5}'
```

### Check the number of available threads in Elasticsearch

```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $4}'
```

### Check the number of active threads in Elasticsearch

```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $3}'
```

### Check the number of rejected requests in Elasticsearch

```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $6}'
```

### Check the number of completed requests in Elasticsearch

```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $7}'
```

### Check the number of failed requests in Elasticsearch

```shell
curl -s -XGET 'http://${ELASTICSEARCH_HOST}:9200/_cat/thread_pool?v' | grep -E '^search' | awk '{print $8}'
```


### Increase the number of threads available in the thread pool in elasticsearch to avoid excessive queuing.

```shell


#!/bin/bash



# Set the number of threads to increase

NEW_THREAD_COUNT=${DESIRED_THREAD_COUNT}



# Set the Elasticsearch configuration file path

ELASTICSEARCH_CONFIG=${ELASTICSEARCH_CONFIG_PATH}



# Set the name of the thread pool to increase

THREAD_POOL_NAME=${THREAD_POOL_NAME}



# Update the thread pool configuration in the Elasticsearch configuration file

sed -i "s/\"$THREAD_POOL_NAME\" : {/\"$THREAD_POOL_NAME\" : {\n    \"size\" : $NEW_THREAD_COUNT,/g" $ELASTICSEARCH_CONFIG



# Restart Elasticsearch to apply the configuration changes

systemctl restart elasticsearch


```


High Number of Queued Threads in Elasticsearch Thread Pool

Overview

Parameters

Debug

Check the number of queued threads in Elasticsearch

Check the number of available threads in Elasticsearch

Check the number of active threads in Elasticsearch

Check the number of rejected requests in Elasticsearch

Check the number of completed requests in Elasticsearch

Check the number of failed requests in Elasticsearch

Repair

Increase the number of threads available in the thread pool in elasticsearch to avoid excessive queuing.

Learn more

Related Runbooks

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