The <ESB_HOME>/repository/conf/nhttp.properties file contains tuning parameters related to HTTP-NIO Transport. These parameters can be modified as required based on your production environment. This information is provided as a reference for users who are already familiar with the product features and want to know how to configure them.
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| Parameter Name | Description | Default Value |
|---|---|---|
http.nio.interest-ops-queueing | Determines whether interestOps() queueing is enabled for the I/O reactors. | true |
HTTP Sender (Client Worker) thread pool parameters
The following parameters relate to worker thread pools that are used to process responses in non-blocking HTTP transport:
| Parameter Name | Description | Default Value | ||
|---|---|---|---|---|
| lst_t_core | Transport sender worker pool's initial thread count Initial number of threads in the response processing worker (Client Worker) pool. If the number of live threads is less than the value defined here, a new thread is created to process the response. | 20 | ||
lst_t_max | Transport sender worker pool's maximum thread count. Once this limit is reached and all the threads in the pool are busy, they will be in a BLOCKED state. In such situations an increase in the number of messages would fire the error SYSTEM ALERT - HttpClientWorker threads were in BLOCKED state during last minuteMaximum number of threads in the response processing worker (Client Worker) pool. If the queue ( | 100 | ||
lst_alive_sec | Sender-side The keep-alive time in seconds for idle threads in the response processing worker pool. Once this time has elapsed for an idle thread, it will be destroyed. The purpose of this parameter is to optimize the usage of resources by avoiding wastage that results from having idle threads. | 5 | ||
lst_qlen | The sender queue lengthlength of the queue that is used to hold runnable tasks to be executed by the response processing worker pool. If the number of live threads is equal to the core pool size (
If the queue is full, all threads are busy and the number of live threads is equal to the max pool size ( | -1 | ||
| lst_io_threads | Sender-side IO workers. | 2 |
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HTTP Listener thread pool parameters
The following parameters relate to worker thread pools that are used to process requests in non-blocking HTTP transport:
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Listener-side parameters should generally have the same values as the sender-side parameters. |
| Parameter Name | Description | Default Value | ||
|---|---|---|---|---|
| snd_t_core | Transport listener worker pool's initial thread count Initial number of threads in the worker thread pool. If the number of live threads is less than the value defined here, a new thread is created to process the request. | 20 | ||
| snd_t_max | Transport listener worker pool's maximum thread count. Once this limit is reached and all the threads in the pool are busy, they will be in a BLOCKED state. In such situations an increase in the number of messages would fire the error SYSTEM ALERT - HttpServerWorker threads were in BLOCKED state during last minuteMaximum number of threads in the request processing worker (Server Worker) pool. If the queue (snd | 100 | ||
| snd_alive_sec | Listener Keep- side keep-alive time in seconds for idle threads in the worker pool. Once this time has elapsed for an idle thread, it will be destroyed. The purpose of this parameter is to optimise the usage of resources by avoiding wastage that results from having idle threads. | 5 | ||
| snd_qlen | The listener queue lengthlength of the queue that is used to hold runnable tasks to be executed by the request processing worker pool. If the number of live threads is equal to the core pool size (
snd_t_max), new requests will be rejected by the request processing worker. | -1 | ||
snd_io_threads | Listener-side IO workers. | 2 |
Other parameters
| Parameter Name | Description | Default Value | |||||
|---|---|---|---|---|---|---|---|
http.block_service_list | If this parameter is set to true, all the services deployed to the WSO2 ESB cannot be viewed from the http(s):<esb>:8280/services/ URL. | false | |||||
http.user.agent.preserve | If this parameter is set to
| false |
Example
The following example shows excerpts from a nhttp.properties file.
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For information on tuning performance of WSO2 ESB using these properties, see Performance Tuning. |