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https://issues.apache.org/jira/browse/CASSANDRA-13871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joshua McKenzie updated CASSANDRA-13871:
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Component/s: Stress
> cassandra-stress user command misbehaves when retrying operations
> -----------------------------------------------------------------
>
> Key: CASSANDRA-13871
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13871
> Project: Cassandra
> Issue Type: Bug
> Components: Stress
> Reporter: Daniel Cranford
> Attachments: 0001-Fixing-cassandra-stress-user-operations-retry.patch
>
>
> o.a.c.stress.Operation will retry queries a configurable number of times.
> When the "user" command is invoked the o.a.c.stress.operations.userdefined
> SchemaInsert and SchemaQuery operations are used.
> When SchemaInsert and SchemaQuery are retried (eg after a Read/WriteTimeout
> exception), they advance the PartitionIterator used to generate the keys to
> insert/query (SchemaInsert.java:85 SchemaQuery.java:129) This means each
> retry will use a different set of keys.
> The predefined set of operations avoid this problem by packaging up the
> arguments to bind to the query into the RunOp object so that retrying the
> operation results in exactly the same query with the same arguments being run.
> This problem was introduced by CASSANDRA-7964. Prior to CASSANDRA-7964 the
> PartitionIterator (Partition.RowIterator before the change) was reinitialized
> prior to each query retry, thus generating the same set of keys each time.
> This problem is reported rather confusingly. The only error that shows up in
> a log file (specified with -log file=foo.log) is the unhelpful
> {noformat}
> java.io.IOException Operation x10 on key(s) [foobarkey]: Error executing:
> (NoSuchElementException)
> at org.apache.cassandra.stress.Operation.error(Operation.java:136)
> at org.apache.cassandra.stress.Operation.timeWithRetry(Operation.java:114)
> at
> org.apache.cassandra.stress.userdefined.SchemaQuery.run(SchemaQuery.java:158)
> at
> org.apache.cassandra.stress.StressAction$Consumer.run(StressAction.java:459)
> {noformat}
> Standard error is only slightly more helpful, displaying the ignorable
> initial read/write error, and confusing java.util.NoSuchElementException
> lines (caused by PartitionIterator exhaustion) followed by the above
> IOException with stack trace, eg
> {noformat}
> com.datastax.drive.core.exceptions.ReadTimeoutException: Cassandra timeout
> during read query....
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.util.NoSuchElementException
> java.io.IOException Operation x10 on key(s) [foobarkey]: Error executing:
> (NoSuchElementException)
> at org.apache.cassandra.stress.Operation.error(Operation.java:136)
> at org.apache.cassandra.stress.Operation.timeWithRetry(Operation.java:114)
> at
> org.apache.cassandra.stress.userdefined.SchemaQuery.run(SchemaQuery.java:158)
> at
> org.apache.cassandra.stress.StressAction$Consumer.run(StressAction.java:459)
> {noformat}
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