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https://issues.apache.org/jira/browse/CASSANDRA-17577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17542470#comment-17542470
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Brad Schoening edited comment on CASSANDRA-17577 at 5/26/22 5:22 PM:
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[~brandon.williams] works for me. That would align the driver + nodetool +
cqlsh.
was (Author: bschoeni):
[~brandon.williams] works for me. That would align the driver + nodetool +
cqlsh.
[~smiklosovic] I Brandon meant alias getreplicas and eventually drop
getendpoints.
> Add cqlsh SHOW REPLICAS by token command
> ----------------------------------------
>
> Key: CASSANDRA-17577
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17577
> Project: Cassandra
> Issue Type: New Feature
> Components: CQL/Interpreter
> Reporter: Brad Schoening
> Assignee: Brad Schoening
> Priority: Normal
> Fix For: 4.x
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> It is often useful to know when a query fails or a query is slow which nodes
> the query was routed too. For clusters with vnodes, determining this is not
> simple and requires an admin tool like 'nodetool getendpoints;.
> But, the Cassandra driver has cluster metadata which identifies which nodes
> are the replicas for a given token range. It should be straightforward to
> support this in CQLSH.
> Example with python driver:
> {quote}from cassandra.cluster import Cluster
> from cassandra.auth import PlainTextAuthProvider
> import cassandra.metadata
> from cassandra.metadata import Murmur3Token
>
> auth_provider = PlainTextAuthProvider(username='cassandra',
> password='cassandra')
> cluster = Cluster(['127.0.0.1'], auth_provider=auth_provider)
> session = cluster.connect('tests')
> cluster.metadata.token_map.get_replicas('tests',Murmur3Token(100))
> {color:#4c9aff}>>>
> cluster.metadata.token_map.get_replicas('tests',Murmur3Token(100)){color}
> {color:#4c9aff}[<Host: 127.0.0.1:9042 datacenter1>]{color}
>
> {quote}
> Users shouldn't require access to an admin tool like nodetool to access the
> cluster metadata. This is especially true for Cassandra-as-a-service
> offerings like AWS keyspaces or Instaclustr's managed service.
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