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https://issues.apache.org/jira/browse/CASSANDRA-20161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17922757#comment-17922757
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Stefan Miklosovic commented on CASSANDRA-20161:
-----------------------------------------------
I was trying to "break this" and I succeeded:
{noformat}
select * from system_views.primary_ids where keyspace_name =
'system_cluster_metadata' and table_name = 'distributed_metadata_log' and key =
'1';
NoHostAvailable: ('Unable to complete the operation against any hosts', {<Host:
127.0.0.1:9042 datacenter1>: <Error from server: code=0000 [Server error]
message="java.lang.UnsupportedOperationException: If you are using a splitting
partitioner, getMaximumToken has to be implemented">})
{noformat}
On server side:
{noformat}
ERROR [Native-Transport-Requests-1] 2025-01-31 16:25:02,339
QueryMessage.java:130 - Unexpected error during query
java.lang.UnsupportedOperationException: If you are using a splitting
partitioner, getMaximumToken has to be implemented
at
org.apache.cassandra.dht.IPartitioner.getMaximumToken(IPartitioner.java:74)
at
org.apache.cassandra.db.virtual.PrimaryIdTable.getBounds(PrimaryIdTable.java:283)
at
org.apache.cassandra.db.virtual.PrimaryIdTable.select(PrimaryIdTable.java:165)
at
org.apache.cassandra.db.SinglePartitionReadCommand$VirtualTableSinglePartitionReadCommand.executeLocally(SinglePartitionReadCommand.java:1398)
at
org.apache.cassandra.db.AbstractReadQuery.executeInternal(AbstractReadQuery.java:65)
at org.apache.cassandra.db.ReadCommand.executeInternal(ReadCommand.java:97)
at
org.apache.cassandra.db.SinglePartitionReadCommand$VirtualTableSinglePartitionReadCommand.execute(SinglePartitionReadCommand.java:1391)
at
org.apache.cassandra.service.pager.AbstractQueryPager.fetchPage(AbstractQueryPager.java:76)
at
org.apache.cassandra.service.pager.SinglePartitionPager.fetchPage(SinglePartitionPager.java:32)
at
org.apache.cassandra.cql3.statements.SelectStatement$Pager$NormalPager.fetchPage(SelectStatement.java:493)
at
org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:550)
at
org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:354)
at
org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:110)
at
org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:286)
at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:379)
at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:366)
at
org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:117)
{noformat}
It is because getMaximumToken is implemented only for Murmur, Random and
OrderPreserving partitioners. For ByteOrderedPartitioner, LocalPartitioner and
ReversedLongLocalPartitioner, this is not overloaded.
I think that the fix would consist of making sure that "getMaximumToken" is
supported. That means that partitioner is "splittable".
I suggest we add a method "supportsSplitting()" returning boolean if
IPartitioner supports this.
> Virtual table to query partition keys in a table
> ------------------------------------------------
>
> Key: CASSANDRA-20161
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20161
> Project: Apache Cassandra
> Issue Type: New Feature
> Components: Feature/Virtual Tables
> Reporter: Chris Lohfink
> Assignee: Chris Lohfink
> Priority: Low
>
> Introduce a new virtual table, {{{}PrimaryIdTable{}}}, to allow users to
> query partition keys and related metadata for a specific table within a
> keyspace. This feature provides insights into SSTable-level details, such as
> token values, size estimates, and SSTable counts, without requiring expensive
> disk-based operations.
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