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Date: Wed, 19 Mar 2014 00:32:44 +0000 (UTC)
From: "Russ Hatch (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12702239.1395172638879.101335.1395189164683@arcas>
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Subject: [jira] [Commented] (CASSANDRA-6883) stress read fails with
 IOException "Data returned was not validated"
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    [ https://issues.apache.org/jira/browse/CASSANDRA-6883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940008#comment-13940008 ] 

Russ Hatch commented on CASSANDRA-6883:
---------------------------------------

Ok, it makes sense that the schema/data has to be present before the reads will work. But given the fact that before the read, I did a million row write with uniform distribution (over only 100 cells) it seems a strange that the read test would fail due to missing data.

I ran my write as above in the description and noticed a weird coincidence. The write step creates a schema as expected:
{noformat}
cqlsh> desc TABLE "Keyspace1"."Standard1";

CREATE TABLE "Keyspace1"."Standard1" (
    key blob PRIMARY KEY,
    "C0" blob,
....................................snip....................................
    "C99" blob
{noformat}

but the last cell never gets populated in that table, it remains null. So I think maybe there's some kind of mismatch between how the uniform distribution is written vs how it is read back (off by one or something).

> 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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