Debug Web UI for StateStore
You can use the StateStore (statestored) Web UI to view
information about memory usage, configuration settings, and ongoing health
checks performed by
To debug and troubleshoot the
statestored daemon using
a web-based interface, open the URL
in a browser. (For secure clusters, use the prefix
https:// instead of
- Main Page
statestoredWeb UI page at / lists the following information about the
- The version of the
- Process start time
- Hardware information
- OS information
- Process information
- CGroup information
- The version of the
- Logs Page
The INFO logs page of the debug Web UI is at /logs under the main
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
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
This page displays the current set of metrics: counters and flags representing various aspects of
- RPC Services Page
The RPC durations page of the
statestoreddebug Web UI is at /rpcz under the main
This page displays information, such as the durations, about the RPC communications of this
statestoredwith other Impala daemons.
- Subscribers Page
The Subscribers page of the debug Web UI is at /subscribers under the main
This page displays information about the other Impala daemons that have registered with the
statestoredto receive and send updates.
- Threadz Page
The Threads page of the debug Web UI is at /threadz under the main
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
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
This page shows the configuration settings in effect when this instance of
statestoredcommunicates 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
- Prometheus Metrics Page
At /metrics_prometheus, under the main
statestoredWeb 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.