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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6883) stress read fails with IOException "Data returned was not validated"
Date Tue, 18 Mar 2014 23:50:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939979#comment-13939979
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Benedict commented on CASSANDRA-6883:
-------------------------------------

Stress read expects all values to be populated, so before you perform a read on a random selection
of columns \(which \-col n=UNIFORM\(1..100\) does\) you need to do a stress write with \-col
n=FIXED\(100\) so that all 100 columns are present and populated with the correct data.

Once this has been done, you can perform random writes or reads (or mixed workloads) to your
heart's contentment

> stress read fails with IOException "Data returned was not validated"
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-6883
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6883
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>         Environment: ccm 3 node cluster, java 1.7.0_51
> cassandra 2.1 branch -- 615612f61566
>            Reporter: Russ Hatch
>
> I'm working to do some basic testing of read/write with the new stress. First, I populate
data using write like so:
> {noformat}
> rhatch@whatup:~/git/cstar/cassandra$ tools/bin/cassandra-stress write n=1000000 CL=ONE
-key dist=FIXED\(1\) -col n=UNIFORM\(1..100\) -schema replication\(factor=3\) -rate threads=50
> {noformat}
> Then I attempt a read test, and this happens:
> {noformat}
> rhatch@whatup:~/git/cstar/cassandra$ tools/bin/cassandra-stress read n=1000000 CL=ONE
-key dist=FIXED\(1\) -col n=UNIFORM\(1..100\) -schema replication\(factor=3\) -rate threads=50
> Warming up READ with 50000 iterations...
> INFO  19:38:14 New Cassandra host /127.0.0.3 added
> INFO  19:38:14 New Cassandra host /127.0.0.2 added
> Connected to cluster: test_stress
> Datatacenter: datacenter1; Host: localhost/127.0.0.1; Rack: rack1
> Datatacenter: datacenter1; Host: /127.0.0.2; Rack: rack1
> Datatacenter: datacenter1; Host: /127.0.0.3; Rack: rack1
> java.io.IOException: Operation [11055] x0 key 0000000001 (0x30303030303030303031) Data
returned was not validated
> 	at org.apache.cassandra.stress.Operation.error(Operation.java:298)
> 	at org.apache.cassandra.stress.Operation.timeWithRetry(Operation.java:276)
> 	at org.apache.cassandra.stress.operations.ThriftReader.run(ThriftReader.java:46)
> 	at org.apache.cassandra.stress.StressAction$Consumer.run(StressAction.java:304)
> Sleeping 2s...
> Running READ with 50 threads  for 1000000 iterations
> ops       ,    op/s,adj op/s,   key/s,    mean,     med,     .95,     .99,    .999, 
   max,   time,   stderr
> 11287     ,   11286,   11286,   11286,     4.7,     3.8,    11.9,    21.8,    34.0, 
  52.9,    1.0,  0.00000
> 23263     ,   11764,   11764,   11764,     4.3,     3.5,    10.4,    18.1,    29.8, 
  51.8,    2.0,  0.00000
> 35300     ,   11889,   11889,   11889,     4.2,     3.7,     9.6,    15.3,    27.3, 
  40.0,    3.0,  0.01467
> 47239     ,   11737,   11737,   11737,     4.3,     3.7,    10.1,    17.0,    26.9, 
  47.7,    4.0,  0.01289
> 59140     ,   11729,   11729,   11729,     4.3,     3.8,     9.6,    15.1,    25.7, 
  47.9,    5.1,  0.00979
> java.io.IOException: Operation [66434] x0 key 0000000001 (0x30303030303030303031) Data
returned was not validated
> 	at org.apache.cassandra.stress.Operation.error(Operation.java:298)
> 	at org.apache.cassandra.stress.Operation.timeWithRetry(Operation.java:276)
> 	at org.apache.cassandra.stress.operations.ThriftReader.run(ThriftReader.java:46)
> 	at org.apache.cassandra.stress.StressAction$Consumer.run(StressAction.java:304)
> 66584     ,   11952,   11952,   11952,     4.2,     3.6,     9.9,    15.7,    24.7, 
  64.9,    5.7,  0.00788
> FAILURE
> {noformat}



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