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Posted to commits@cassandra.apache.org by "Brandon Williams (Jira)" <ji...@apache.org> on 2025/07/08 16:04:00 UTC
[jira] [Commented] (CASSANDRA-20751) Cassandra uses default compaction strategy in storage_compatibility_mode which can lead to unsupported compaction strategy during upgrades
[ https://issues.apache.org/jira/browse/CASSANDRA-20751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18003847#comment-18003847 ]
Brandon Williams commented on CASSANDRA-20751:
----------------------------------------------
The patch on CASSANDRA-20118 defers this change to later SCM modes.
> Cassandra uses default compaction strategy in storage_compatibility_mode which can lead to unsupported compaction strategy during upgrades
> ------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-20751
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20751
> Project: Apache Cassandra
> Issue Type: Bug
> Reporter: Andrew D
> Priority: Normal
>
> With Cassandra 5 and the cassandra-latest.yaml, UCS is selected as the default compaction strategy. When upgrading a cluster, via a datacenter switch for example, the compaction for system_auth, system_distributed and system_traces gets updated to use UCS even though there's still Cassandra 4 nodes within the cluster. This leads to a failure mode where a Cassandra 4 node cannot start up due to an unknown compaction strategy:
> {code:java}
> ERROR [main] 2025-07-02 17:09:39,693 CassandraDaemon.java:898 - Exception encountered during startup
> org.apache.cassandra.exceptions.ConfigurationException: Unable to find compaction strategy class 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy' {code}
> Even with storage_compatibility_mode, the default compaction strategy is used. To mitigate this, we can update the default compaction strategy however the system_schema still indicates that UCS is used:
> {code:java}
> keyspace_name | table_name | compaction
> --------------------+--------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> system_auth | cidr_groups | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'}
> system_auth | cidr_permissions | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'}
> system_auth | identity_to_role | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'}
> system_auth | network_permissions | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'}
> system_auth | resource_role_permissons_index | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'}
> system_auth | role_members | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'}
> system_auth | role_permissions | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'}
> system_auth | roles | {'class': 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy', 'max_sstables_to_compact': '64', 'min_sstable_size': '100MiB', 'scaling_parameters': 'T4', 'sstable_growth': '0.3333333333333333', 'target_sstable_size': '1GiB'} {code}
> There isn't an easy way to update the compaction strategy for these tables either.
>
>
>
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