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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5839) BytesRefArrayWritable compareTo violates contract
Date Mon, 18 Nov 2013 21:59:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825820#comment-13825820
] 

Hive QA commented on HIVE-5839:
-------------------------------



{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12614469/HIVE-5839.patch

{color:red}ERROR:{color} -1 due to 2 failed/errored test(s), 4617 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_dynamic_partition_skip_default
org.apache.hadoop.hive.ql.io.TestRCFile.testWriteAndPartialRead
{noformat}

Test results: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/347/testReport
Console output: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/347/console

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests failed with: TestsFailedException: 2 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12614469

> BytesRefArrayWritable compareTo violates contract
> -------------------------------------------------
>
>                 Key: HIVE-5839
>                 URL: https://issues.apache.org/jira/browse/HIVE-5839
>             Project: Hive
>          Issue Type: Bug
>          Components: Serializers/Deserializers
>    Affects Versions: 0.11.0, 0.12.0
>            Reporter: Ian Robertson
>            Assignee: Xuefu Zhang
>         Attachments: HIVE-5839.patch
>
>
> BytesRefArrayWritable's compareTo violates the compareTo contract from java.lang.Object.
Specifically:
> * The implementor must ensure sgn(x.compareTo( y )) == -sgn(y.compareTo( x )) for all
x and y.
> The compareTo implementation on BytesRefArrayWritable does a proper comparison of the
sizes of the two instances. However, if the sizes are the same, it proceeds to do a check
if both array's have the same constant. If not, it returns 1. This means that if x and y are
two BytesRefArrayWritable instances with the same size, but different contents, then x.compareTo(
y ) == 1 and y.compareTo( x ) == 1.
> Additionally, the comparison of contents is order agnostic. This seems wrong, since order
of entries should matter. It is also very inefficient, running at O(n^2), where n is the number
of entries.



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