[
https://issues.apache.org/jira/browse/CASSANDRA-16513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Brandon Williams updated CASSANDRA-16513:
-----------------------------------------
Change Category: Operability
Complexity: Normal
Status: Open (was: Triage Needed)
> Add nodetool command to display or export the contents of a virtual table
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-16513
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16513
> Project: Cassandra
> Issue Type: Improvement
> Components: Observability/Metrics, Tool/nodetool
> Reporter: Paulo Motta
> Priority: Normal
> Labels: gsoc2021, mentor
>
> Several virtual tables were recently added, but they're currently only
> accessible via cqlsh or programmatically. While this is valuable for many use
> cases, operators are accustomed with the convenience of querying system
> metrics with a simple nodetool command.
> In addition to that, a relatively common request is to provide nodetool
> output in different formats (JSON, YAML and even XML) (CASSANDRA-5977,
> CASSANDRA-12035, CASSANDRA-12486, CASSANDRA-12698, CASSANDRA-12503). However
> this requires lots of manual labor as each nodetool subcommand needs to be
> adapted to support new output formats.
> I propose adding a new nodetool command that will consistently print to the
> standard output the contents of a virtual table. By default the command will
> print the output in a human-readable tabular format similar to cqlsh, but a
> "--format" parameter can be specified to modify the output to some other
> format like JSON or YAML.
> It should be possible to add a limit to the amount of rows displayed and
> filter to display only rows from a specific keyspace or table. The command
> should be flexible and provide simple hooks for registration and
> customization of new virtual tables.
> I propose calling this command nodetool show <virtualtable> (naming
> bikeshedding welcome), for example:
> {noformat}
> nodetool show --list
> caches
> clients
> internode_inbound
> internode_outbound
> settings
> sstable_tasks
> system_properties
> thread_pools
> nodetool show clients --format yaml
> ...
> nodetool show internode_outboud --format json
> ...
> nodetool show sstabletasks --keyspace my_ks --table -my_table
> ...
> {noformat}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
