IndexPool MBean

The IndexPool MBean exposes metrics around the progress of indexing tasks as they move through the pipeline, and provides a mechanism to tweak the flushing, concurrency, and back-pressure behavior of a core indexing thread pool.

The IndexPool MBean is useful for controlling task submission and flush with these properties:

Configurable concurrency

The maximum number of concurrent workers is predefined at construction time. The actual concurrency can be dynamically configured between 1 (synchronous execution) and the given max concurrency.

Flow control via back pressure

To reduce memory consumption in case of fast producers, back pressure throttles incoming tasks. Back-pressure is applied directly as a result of the size of the global RAM buffer.


The IndexPool MBean is identified by the following path:


  • search is the MBean type

  • keyspace_name.table_name is the search index (core) that the metrics reference

  • IndexPool is the MBean name

Configurable attributes

The attributes are effective only until the node is restarted. To make the change permanent, you must change the corresponding option in dse.yaml.

Where is the dse.yaml file?

The location of the dse.yaml file depends on the type of installation:

Installation Type Location

Package installations + Installer-Services installations


Tarball installations + Installer-No Services installations



The maximum time, in milliseconds, to wait before flushing asynchronous index updates, which occurs at DSE Search commit time or at database flush time. See the flush_max_time_per_core option in dse.yaml. (DSE 6.8 | 6.7 | 6.0 | 5.1)


The maximum number of concurrent asynchronous indexing threads.

View-only attributes

You can get the following MBean operations:


Get the average back pressure pause.


Get the 1-minute rate of ingested tasks per second.


Get the predefined max concurrency level.


Get the 1-minute rate of processed tasks per second.


Get the total number of processed tasks for all workers.


Get the current size of each processing queues.


Get the last processing time for all workers. Could be 0 in case the clock resolution is too coarse.


The 1-minute rate of work throughput per second.


Get the total size of all processing queues.

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