Cloudera Docs

Debug Web UI for StateStore

The StateStore (statestored) Web UI includes information about memory usage, configuration settings, and ongoing health checks performed by statestored.

To debug and troubleshoot the statestored daemon using a web-based interface, open the URL http://impala‑server‑hostname:25010/ in a browser. (For secure clusters, use the prefix https:// instead of http://.)

Main Page

The main statestored Web UI page at / lists the following information about the statestored:

  • The version of the statestored daemon
  • Process start time
  • Hardware information
  • OS information
  • Process information
  • CGroup information
Logs Page

The INFO logs page of the debug Web UI is at /logs under the main statestored Web UI.

This page shows the last portion of the statestored.INFO log file, including the info, warning, and error logs for the statestored. You can refer here to see the details of the most recent operations, whether the operations succeeded or encountered errors. This page provides one central place for the log files and saves you from looking around the filesystem for the log files, which could be in different locations on clusters that use cluster management software.

Memz Page

The Memory Usage page of the debug Web UI is at /memz under the main statestored Web UI.

This page displays summary and detailed information about memory usage by the statestored. You can see the memory limit in effect for the node, and how much of that memory Impala is currently using.

Metrics Page

The Metrics page of the debug Web UI is at /metrics under the main statestored Web UI.

This page displays the current set of metrics: counters and flags representing various aspects of statestored internal operation.

RPC Services Page

The RPC durations page of the statestored debug Web UI is at /rpcz under the main statestored Web UI.

This page displays information, such as the durations, about the RPC communications of this statestored with other Impala daemons.

Subscribers Page

The Subscribers page of the debug Web UI is at /subscribers under the main statestored Web UI.

This page displays information about the other Impala daemons that have registered with the statestored to receive and send updates.

Threadz Page

The Threads page of the debug Web UI is at /threadz under the main statestored Web UI.

This page displays information about the threads used by this instance of statestored, and shows which categories they are grouped into. Making use of this information requires substantial knowledge about Impala internals.

Topics Page

The Topics page of the debug Web UI is at /topics under the main statestored Web UI.

This page displays information about the topics to which the other Impala daemons have registered to receive updates.

Varz Page

The Varz page of the debug Web UI is at /varz under the main statestored Web UI.

This page shows the configuration settings in effect when this instance of statestored communicates with other Hadoop components such as HDFS and YARN. These settings are collected from a set of configuration files.

The bottom of this page also lists all the command-line settings in effect for this instance of statestored.

Prometheus Metrics Page

At /metrics_prometheus, under the main statestored Web UI, the metrics are generated in Prometheus exposition format that Prometheus can consume for event monitoring and alerting.

The /metrics_prometheus is not shown in the Web UI list of pages.