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Posted to commits@cassandra.apache.org by "Siddharth Singh Chouhan (Jira)" <ji...@apache.org> on 2021/04/11 00:51:00 UTC
[jira] [Commented] (CASSANDRA-16513) Add nodetool command to
display or export the contents of a virtual table
[ https://issues.apache.org/jira/browse/CASSANDRA-16513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17318615#comment-17318615 ]
Siddharth Singh Chouhan commented on CASSANDRA-16513:
-----------------------------------------------------
[~paulo] Hey!
Can you please provide some resources for this issue?
> 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}
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