Jay Zhuang created CASSANDRA-14890:
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Summary: cassandra-stress hang for 200 seconds if n is not
specified
Key: CASSANDRA-14890
URL: https://issues.apache.org/jira/browse/CASSANDRA-14890
Project: Cassandra
Issue Type: Bug
Components: Stress
Reporter: Jay Zhuang
Assignee: Jay Zhuang
if parameter {{n}} is not specified, cassandra-stress will hang (wait) for 200
seconds between warm-up and sending traffic.
For example, the following command will hang 200 seconds before sending the
traffic:
{noformat}
$ ./tools/bin/cassandra-stress write
...
Created keyspaces. Sleeping 1s for propagation.
Sleeping 2s...
Warming up WRITE with 0 iterations...
Failed to connect over JMX; not collecting these stats
{noformat}
It's waiting for this:
[https://github.com/apache/cassandra/blob/06209037ea56b5a2a49615a99f1542d6ea1b2947/tools/stress/src/org/apache/cassandra/stress/util/Uncertainty.java#L72]
As there's no warm-up traffic (CASSANDRA-13773), it will wait until:
{noformat}
(measurements >= waiter.maxMeasurements)
{noformat}
{{maxMeasurements}} is 200 by default:
[https://github.com/apache/cassandra/blob/06209037ea56b5a2a49615a99f1542d6ea1b2947/tools/stress/src/org/apache/cassandra/stress/settings/SettingsCommand.java#L153]
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