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Posted to common-issues@hadoop.apache.org by "Radim Kolar (JIRA)" <ji...@apache.org> on 2012/11/24 22:36:57 UTC
[jira] [Created] (HADOOP-9088) Add Murmur3 hash
Radim Kolar created HADOOP-9088:
-----------------------------------
Summary: Add Murmur3 hash
Key: HADOOP-9088
URL: https://issues.apache.org/jira/browse/HADOOP-9088
Project: Hadoop Common
Issue Type: Improvement
Reporter: Radim Kolar
faster and better then murmur2
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[jira] [Updated] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar updated HADOOP-9088:
--------------------------------
Attachment: murmur3-3.txt
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Updated] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar updated HADOOP-9088:
--------------------------------
Attachment: murmur3.txt
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505008#comment-13505008 ]
Hadoop QA commented on HADOOP-9088:
-----------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12555068/murmur3-6.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in hadoop-common-project/hadoop-common.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/1831//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1831//console
This message is automatically generated.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3-4.txt, murmur3-5.txt, murmur3-6.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503600#comment-13503600 ]
Radim Kolar commented on HADOOP-9088:
-------------------------------------
this will be faster variant of murmur3
https://issues.apache.org/jira/secure/attachment/12501962/MAHOUT-862.patch
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504945#comment-13504945 ]
Hadoop QA commented on HADOOP-9088:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12555062/murmur3-4.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new or modified test files.
{color:red}-1 javac{color:red}. The patch appears to cause the build to fail.
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1829//console
This message is automatically generated.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3-4.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Updated] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar updated HADOOP-9088:
--------------------------------
Attachment: murmur3-4.txt
faster variant from mahout
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3-4.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503449#comment-13503449 ]
Hadoop QA commented on HADOOP-9088:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12554780/murmur3.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse.
{color:red}-1 findbugs{color}. The patch appears to introduce 1 new Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in hadoop-common-project/hadoop-common.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/1816//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/1816//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-common.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1816//console
This message is automatically generated.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Updated] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar updated HADOOP-9088:
--------------------------------
Attachment: murmur3-2.txt
shutup findbugs
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Todd Lipcon (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504824#comment-13504824 ]
Todd Lipcon commented on HADOOP-9088:
-------------------------------------
Hi Radim. We don't currently use the murmur2 hash anywhere AFAIK. Where do you anticipate wanting to use this new hash function?
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Todd Lipcon (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504886#comment-13504886 ]
Todd Lipcon commented on HADOOP-9088:
-------------------------------------
I don't think HashPartitioner can be changed to use anything but Object.hashCode (which we assume the user has implemented). Changing WritableComparator to use a different hash hardly seems worth it. Have you seen cases where the existing hash code causes poor distribution?
Also, I don't think we can change the default hashcode for existing types, since it would change user-visible partitioning behavior. Adding a new TextPartitioner which uses Murmur3 sounds useful, if you can show that there are indeed real-world datasets where the "poor hash behavior" of the existing partitioner causes skew.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3.txt
>
>
> faster and better then murmur2
--
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503453#comment-13503453 ]
Hadoop QA commented on HADOOP-9088:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12554781/murmur3-2.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse.
{color:red}-1 findbugs{color}. The patch appears to introduce 1 new Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in hadoop-common-project/hadoop-common.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/1817//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/1817//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-common.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1817//console
This message is automatically generated.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Assigned] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar reassigned HADOOP-9088:
-----------------------------------
Assignee: Radim Kolar
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504955#comment-13504955 ]
Hadoop QA commented on HADOOP-9088:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12555064/murmur3-5.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new or modified test files.
{color:red}-1 javac{color:red}. The patch appears to cause the build to fail.
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1830//console
This message is automatically generated.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3-4.txt, murmur3-5.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Updated] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar updated HADOOP-9088:
--------------------------------
Status: Patch Available (was: Open)
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504865#comment-13504865 ]
Radim Kolar commented on HADOOP-9088:
-------------------------------------
to improve hashing. WritableComparator hash is weak (used by binarypartitioner), HashPartitioner sucks even more (using object.hashcode), i will add TextPartitioner using murmur3, it have good distribution of results.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3.txt
>
>
> faster and better then murmur2
--
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[jira] [Updated] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar updated HADOOP-9088:
--------------------------------
Attachment: murmur3-6.txt
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3-4.txt, murmur3-5.txt, murmur3-6.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504919#comment-13504919 ]
Radim Kolar commented on HADOOP-9088:
-------------------------------------
Hash partitioner can do same thing like java hashtable - rehashing hashCode() to get better distribution. current hash quality in hadoop is low if you have lot of similar strings like "aaaaaaaa" "aaaaaab" you will get about 20% unoptimal partitions in average cases. but in some specific cases it can split like 80:20 istead of close 50:50
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3.txt
>
>
> faster and better then murmur2
--
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503457#comment-13503457 ]
Hadoop QA commented on HADOOP-9088:
-----------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12554783/murmur3-3.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in hadoop-common-project/hadoop-common.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/1818//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/1818//console
This message is automatically generated.
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3.txt
>
>
> faster and better then murmur2
--
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[jira] [Commented] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504941#comment-13504941 ]
Radim Kolar commented on HADOOP-9088:
-------------------------------------
bloom filter code is using util.Hash family of functions
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3-4.txt, murmur3.txt
>
>
> faster and better then murmur2
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[jira] [Updated] (HADOOP-9088) Add Murmur3 hash
Posted by "Radim Kolar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-9088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Radim Kolar updated HADOOP-9088:
--------------------------------
Attachment: murmur3-5.txt
> Add Murmur3 hash
> ----------------
>
> Key: HADOOP-9088
> URL: https://issues.apache.org/jira/browse/HADOOP-9088
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Radim Kolar
> Assignee: Radim Kolar
> Attachments: murmur3-2.txt, murmur3-3.txt, murmur3-4.txt, murmur3-5.txt, murmur3.txt
>
>
> faster and better then murmur2
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