Debug Web UI for Catalog Server
The Catalog Server (catalogd) Web UI includes
information about the databases, tables, and other objects managed by
Impala, in addition to the resource usage and configuration settings of the
The main page of the debug Web UI is at
(non-secure cluster) or
- Main Page
catalogdWeb 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
- Catalog Page
The Catalog page of the debug Web UI is at /catalog under the main
This page displays a list of databases and associated tables recognized by this instance of
catalogd. You can use this page to locate which database a table is in, check the exact spelling of a database or table name, look for identical table names in multiple databases. The catalog information is represented as the underlying Thrift data structures.
The JMX page of the
catalogddebug Web UI is at /jmx under the main
This page displays monitoring information about various JVM subsystems, such as memory pools, thread management, runtime. etc.
- Java Log Level
The Change log level page of the
catalogddebug Web UI is at /log_level under the main
The page displays the current Java and backend log levels and allows you to change the log levels dynamically without having to restart 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
catalogd.INFOlog file, including the info, warning, and error logs for the
catalogddaemon. 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
catalogd. 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
catalogddebug Web UI is at /rpcz under the main
This page displays information, such as the durations, about the RPC communications of this
catalogdwith other Impala daemons.
- 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
catalogd, and shows which categories they are grouped into. Making use of this information requires substantial knowledge about Impala internals.
- 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
catalogdcommunicates 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
catalogdWeb 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.