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https://issues.apache.org/jira/browse/CASSANDRA-18697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yifan Cai updated CASSANDRA-18697:
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Reviewers: Yifan Cai, Yifan Cai
Status: Review In Progress (was: Patch Available)
> Skip ColumnFamilyStore#topPartitions initialization when client or tool mode
> ----------------------------------------------------------------------------
>
> Key: CASSANDRA-18697
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18697
> Project: Cassandra
> Issue Type: Bug
> Components: Tool/bulk load
> Reporter: Francisco Guerrero
> Assignee: Francisco Guerrero
> Priority: Normal
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In {{org.apache.cassandra.db.ColumnFamilyStore}} the {{topPartitions}} is
> initialized when the keyspace is not a system keyspace. However, when running
> the cassandra library as client mode or tool mode, the initialization also
> happens. However, {{TopPartitionTracker}} performs queries to the {{system}}
> keyspace, which might not be available in most of the cases. For that reason,
> we should skip initialization of {{topPartitions}} when running on client
> mode or tool mode.
> In utilities and external libraries, this can produce a warning that is
> displayed with a stack trace. This warning can be misleading for end users,
> and can cause confusion. But more importantly, the initialization of
> {{topPartitions}} is not required in this mode.
> The warning is similar to this:
> {code:java}
> WARN org.apache.cassandra.db.SystemKeyspace: Could not load stored top
> SIZES partitions for ...
> org.apache.cassandra.db.KeyspaceNotDefinedException: keyspace system does
> not exist
> at
> org.apache.cassandra.schema.Schema.validateTable(Schema.java:xxx) ~[?:?]
> at
> org.apache.cassandra.cql3.statements.SelectStatement$RawStatement.prepare(SelectStatement.java:xxx)
> ~[?:?]
> at
> org.apache.cassandra.cql3.statements.SelectStatement$RawStatement.prepare(SelectStatement.java:xxx)
> ~[?:?]
> at
> org.apache.cassandra.cql3.statements.SelectStatement$RawStatement.prepare(SelectStatement.java:xxx)
> ~[?:?]
> at
> org.apache.cassandra.cql3.QueryProcessor.parseAndPrepare(QueryProcessor.java:xxx)
> ~[?:?]
> ... {code}
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