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Posted to common-dev@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2009/01/15 19:00:59 UTC
[jira] Created: (HADOOP-5052) Add an example for computing exact
digits of Pi
Add an example for computing exact digits of Pi
-----------------------------------------------
Key: HADOOP-5052
URL: https://issues.apache.org/jira/browse/HADOOP-5052
Project: Hadoop Core
Issue Type: New Feature
Components: examples
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE updated HADOOP-5052:
-------------------------------------------
Attachment: 5052_20090203.patch
5052_20090203.patch:
- added IMPLEMENTATION_LIMIT, so that it won't return incorrect result
- refactored some codes and added more comments
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE updated HADOOP-5052:
-------------------------------------------
Attachment: 5052_20090211.patch
5052_20090211.patch:
- Defined a new InputFormat instead of using default (thanks Chris again for showing me how to do it).
- Improved 20% performance.
- Added unit tests.
- Checked the results for the first 1 million digits and all 10^k th digits which supported by the implementation.
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch, 5052_20090211.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Chris Douglas (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Douglas updated HADOOP-5052:
----------------------------------
Resolution: Fixed
Fix Version/s: 0.21.0
Status: Resolved (was: Patch Available)
I committed this. Thanks, Nicholas
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 0.21.0
>
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch, 5052_20090211.patch, 5052_20090219.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Commented: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Hudson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675928#action_12675928 ]
Hudson commented on HADOOP-5052:
--------------------------------
Integrated in Hadoop-trunk #763 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/763/])
. Add an example computing exact digits of pi using the
Bailey-Borwein-Plouffe algorithm. Contributed by Tsz Wo (Nicholas), SZE
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 0.21.0
>
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch, 5052_20090211.patch, 5052_20090219.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE updated HADOOP-5052:
-------------------------------------------
Attachment: 5052_20090219.patch
5052_20090219.patch: seems that the progress thread is not really a good idea. Removed it.
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch, 5052_20090211.patch, 5052_20090219.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE updated HADOOP-5052:
-------------------------------------------
Hadoop Flags: [Reviewed]
Status: Patch Available (was: Open)
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch, 5052_20090211.patch, 5052_20090219.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Commented: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675578#action_12675578 ]
Hadoop QA commented on HADOOP-5052:
-----------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12400566/5052_20090219.patch
against trunk revision 746340.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac compiler warnings.
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+1 Eclipse classpath. The patch retains Eclipse classpath integrity.
+1 release audit. The applied patch does not increase the total number of release audit warnings.
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3892/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3892/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3892/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3892/console
This message is automatically generated.
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch, 5052_20090211.patch, 5052_20090219.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE updated HADOOP-5052:
-------------------------------------------
Attachment: 5052_20090127.patch
5052_20090127.patch:
- used new map/reduce API (Thanks Chris for converting an earlier patch to the new API).
- added an offset parameter.
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Commented: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Chris Douglas (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675185#action_12675185 ]
Chris Douglas commented on HADOOP-5052:
---------------------------------------
The progress/logging thread should probably be removed. Though it's not obvious where one should report progress for this, a separate thread is definitely discouraged. If it's been useful for debugging, then it should at least be disabled by default (and named DebugThread or something).
Otherwise this looks great. +1
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch, 5052_20090127.patch, 5052_20090203.patch, 5052_20090211.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE updated HADOOP-5052:
-------------------------------------------
Attachment: 5052_20090115_0.18.patch
5052_20090115_0.18.patch: for 0.18
Here is a sample output:
{noformat}
bash-3.2$ ./bin/hadoop jar build/hadoop-0.18.3-dev-examples.jar bbp 4 1000
Number of Maps = 4
Digits per Map = 1000
Starting Job ...
09/01/15 11:22:22 INFO mapred.FileInputFormat: Total input paths to process : 4
09/01/15 11:22:22 INFO mapred.FileInputFormat: Total input paths to process : 4
09/01/15 11:22:22 INFO mapred.JobClient: Running job: job_200901150913_0015
09/01/15 11:22:23 INFO mapred.JobClient: map 0% reduce 0%
09/01/15 11:22:25 INFO mapred.JobClient: map 25% reduce 0%
09/01/15 11:22:28 INFO mapred.JobClient: map 50% reduce 0%
09/01/15 11:22:32 INFO mapred.JobClient: map 75% reduce 0%
09/01/15 11:22:36 INFO mapred.JobClient: map 100% reduce 0%
09/01/15 11:22:41 INFO mapred.JobClient: Job complete: job_200901150913_0015
09/01/15 11:22:41 INFO mapred.JobClient: Counters: 16
09/01/15 11:22:41 INFO mapred.JobClient: File Systems
09/01/15 11:22:41 INFO mapred.JobClient: HDFS bytes read=452
09/01/15 11:22:41 INFO mapred.JobClient: HDFS bytes written=2143
09/01/15 11:22:41 INFO mapred.JobClient: Local bytes read=2094
09/01/15 11:22:41 INFO mapred.JobClient: Local bytes written=4374
09/01/15 11:22:41 INFO mapred.JobClient: Job Counters
09/01/15 11:22:41 INFO mapred.JobClient: Launched reduce tasks=1
09/01/15 11:22:41 INFO mapred.JobClient: Launched map tasks=4
09/01/15 11:22:41 INFO mapred.JobClient: Data-local map tasks=4
09/01/15 11:22:41 INFO mapred.JobClient: Map-Reduce Framework
09/01/15 11:22:41 INFO mapred.JobClient: Reduce input groups=4
09/01/15 11:22:41 INFO mapred.JobClient: Combine output records=0
09/01/15 11:22:41 INFO mapred.JobClient: Map input records=4
09/01/15 11:22:41 INFO mapred.JobClient: Reduce output records=4
09/01/15 11:22:41 INFO mapred.JobClient: Map output bytes=2048
09/01/15 11:22:41 INFO mapred.JobClient: Map input bytes=80
09/01/15 11:22:41 INFO mapred.JobClient: Combine input records=0
09/01/15 11:22:41 INFO mapred.JobClient: Map output records=4
09/01/15 11:22:41 INFO mapred.JobClient: Reduce input records=4
Job Finished in 19.859 seconds.
Pi = 0x3.24 3f 6a 88 85 a3 08 d3 13 19 8a 2e 03 70 73 44 a4 09 38 22 29 9f 31
d0 08 2e fa 98 ec 4e 6c 89 45 28 21 e6 38 d0 13 77 be 54 66 cf 34 e9
0c 6c c0 ac 29 b7 c9 7c 50 dd 3f 84 d5 b5 b5 47 09 17 92 16 d5 d9 89
79 fb 1b d1 31 0b a6 98 df b5 ac 2f fd 72 db d0 1a df b7 b8 e1 af ed
6a 26 7e 96 ba 7c 90 45 f1 2c 7f 99 24 a1 99 47 b3 91 6c f7 08 01 f2
e2 85 8e fc 16 63 69 20 d8 71 57 4e 69 a4 58 fe a3 f4 93 3d 7e 0d 95
74 8f 72 8e b6 58 71 8b cd 58 82 15 4a ee 7b 54 a4 1d c2 5a 59 b5 9c
30 d5 39 2a f2 60 13 c5 d1 b0 23 28 60 85 f0 ca 41 79 18 b8 db 38 ef
8e 79 dc b0 60 3a 18 0e 6c 9e 0e 8b b0 1e 8a 3e d7 15 77 c1 bd 31 4b
27 78 af 2f da 55 60 5c 60 e6 55 25 f3 aa 55 ab 94 57 48 98 62 63 e8
14 40 55 ca 39 6a 2a ab 10 b6 b4 cc 5c 34 11 41 e8 ce a1 54 86 af 7c
72 e9 93 b3 ee 14 11 63 6f bc 2a 2b a9 c5 5d 74 18 31 f6 ce 5c 3e 16
9b 87 93 1e af d6 ba 33 6c 24 cf 5c 7a 32 53 81 28 95 86 77 3b 8f 48
98 6b 4b b9 af c4 bf e8 1b 66 28 21 93 61 d8 09 cc fb 21 a9 91 48 7c
ac 60 5d ec 80 32 ef 84 5d 5d e9 85 75 b1 dc 26 23 02 eb 65 1b 88 23
89 3e 81 d3 96 ac c5 0f 6d 6f f3 83 f4 42 39 2e 0b 44 82 a4 84 20 04
69 c8 f0 4a 9e 1f 9b 5e 21 c6 68 42 f6 e9 6c 9a 67 0c 9c 61 ab d3 88
f0 6a 51 a0 d2 d8 54 2f 68 96 0f a7 28 ab 51 33 a3 6e ef 0b 6c 13 7a
3b e4 ba 3b f0 50 7e fb 2a 98 a1 f1 65 1d 39 af 01 76 66 ca 59 3e 82
43 0e 88 8c ee 86 19 45 6f 9f b4 7d 84 a5 c3 3b 8b 5e be e0 6f 75 d8
85 c1 20 73 40 1a 44 9f 56 c1 6a a6 4e d3 aa 62 36 3f 77 06 1b fe df
72 42 9b 02 3d 37 d0 d7 24 d0 0a 12 48 db 0f ea d3 49 f1 c0 9b 07 53
72 c9 80 99 1b 7b 25 d4 79 d8 f6 e8 de f7 e3 fe 50 1a b6 79 4c 3b 97
6c e0 bd 04 c0 06 ba c1 a9 4f b6 40 9f 60 c4 5e 5c 9e c2 19 6a 24 63
68 fb 6f af 3e 6c 53 b5 13 39 b2 eb 3b 52 ec 6f 6d fc 51 1f 9b 30 95
2c cc 81 45 44 af 5e bd 09 be e3 d0 04 de 33 4a fd 66 0f 28 07 19 2e
4b b3 c0 cb a8 57 45 c8 74 0f d2 0b 5f 39 b9 d3 fb db 55 79 c0 bd 1a
60 32 0a d6 a1 00 c6 40 2c 72 79 67 9f 25 fe fb 1f a3 cc 8e a5 e9 f8
db 32 22 f8 3c 75 16 df fd 61 6b 15 2f 50 1e c8 ad 05 52 ab 32 3d b5
fa fd 23 87 60 53 31 7b 48 3e 00 df 82 9e 5c 57 bb ca 6f 8c a0 1a 87
56 2e df 17 69 db d5 42 a8 f6 28 7e ff c3 ac 67 32 c6 8c 4f 55 73 69
5b 27 b0 bb ca 58 c8 e1 ff a3 5d b8 f0 11 a0 10 fa 3d 98 fd 21 83 b8
4a fc b5 6c 2d d1 d3 5b 9a 53 e4 79 b6 f8 45 65 d2 8e 49 bc 4b fb 97
90 e1 dd f2 da a4 cb 7e 33 62 fb 13 41 ce e4 c6 e8 ef 20 ca da 36 77
4c 01 d0 7e 9e fe 2b f1 1f b4 95 db da 4d ae 90 91 98 ea ad 8e 71 6b
93 d5 a0 d0 8e d1 d0 af c7 25 e0 8e 3c 5b 2f 8e 75 94 b7 8f f6 e2 fb
f2 12 2b 64 88 88 b8 12 90 0d f0 1c 4f ad 5e a0 68 8f c3 1c d1 cf f1
91 b3 a8 c1 ad 2f 2f 22 18 be 0e 17 77 ea 75 2d fe 8b 02 1f a1 e5 a0
cc 0f b5 6f 74 e8 18 ac f3 d6 ce 89 e2 99 b4 a8 4f e0 fd 13 e0 b7 7c
c4 3b 81 d2 ad a8 d9 16 5f a2 66 80 95 77 05 93 cc 73 14 21 1a 14 77
e6 ad 20 65 77 b5 fa 86 c7 54 42 f5 fb 9d 35 cf eb cd af 0c 7b 3e 89
a0 d6 41 1b d3 ae 1e 7e 49 00 25 0e 2d 20 71 b3 5e 22 68 00 bb 57 b8
e0 af 24 64 36 9b f0 09 b9 1e 55 63 91 1d 59 df a6 aa 78 c1 43 89 d9
5a 53 7f 20 7d 5b a2 02 e5 b9 c5 83 26 03 76 62 95 cf a9 11 c8 19 68
4e 73 4a 41 b3 47 2d ca 7b 14 a9 4a 1b 51 00 52 9a 53 29 15 d6 0f 57
3f bc 9b c6 e4 2b 60 a4 76 81 e6 74 00 08 ba 6f b5 57 1b e9 1f f2 96
ec 6b 2a 0d d9 15 b6 63 65 21 e7 b9 f9 b6 ff 34 05 2e c5 85 56 64 53
b0 2d 5d a9 9f 8f a1 08 ba 47 99 6e 85 07 6a 4b 7a 70 e9 b5 b3 29 44
db 75 09 2e c4 19 26 23 ad 6e a6 b0 49 a7 df 7d 9c ee 60 b8 8f ed b2
66 ec aa 8c 71 69 9a 17 ff 56 64 52 6c c2 b1 9e e1 19 36 02 a5 75 09
4c 29 a0 59 13 40 e4 18 3a 3e 3f 54 98 9a 5b 42 9d 65 6b 8f e4 d6 99
f7 3f d6 a1 d2 9c 07 ef e8 30 f5 4d 2d 38 e6 f0 25 5d c1 4c dd 20 86
84 70 eb 26 63 82 e9 c6 02 1e cc 5e 09 68 6b 3f 3e ba ef c9 3c 97 18
14 6b 6a 70 a1 68 7f 35 84 52 a0 e2 86 b7 9c 53 05 aa 50 07 37 3e 07
84 1c 7f de ae 5c 8e 7d 44 ec 57 16 f2 b8 b0 3a da 37 f0 50 0c 0d f0
1c 1f 04 02 00 b3 ff ae 0c f5 1a 3c b5 74 b2 25 83 7a 58 dc 09 21 bd
d1 91 13 f9 7c a9 2f f6 94 32 47 73 22 f5 47 01 3a e5 e5 81 37 c2 da
dc c8 b5 76 34 9a f3 dd a7 a9 44 61 46 0f d0 03 0e ec c8 c7 3e a4 75
1e 41 e2 38 cd 99 3b ea 0e 2f 32 80 bb a1 18 3e b3 31 4e 54 8b 38 4f
6d b9 08 6f 42 0d 03 f6 0a 04 bf 2c b8 12 90 24 97 7c 79 56 79 b0 72
bc af 89 af de 9a 77 1f d9 93 08 10 b3 8b ae 12 dc cf 3f 2e 55 12 72
1f 2e 6b 71 24 50 1a dd e6 9f 84 cd 87 7a 58 47 18 74 08 da 17 bc 9f
9a bc e9 4b 7d 8c ec 7a ec 3a db 85 1d fa 63 09 43 66 c4 64 c3 d2 ef
1c 18 47 32 15 d9 08 dd 43 3b 37 24 c2 ba 16 12 a1 4d 43 2a 65 c4 51
50 94 00 02 13 3a e4 dd 71 df f8 9e 10 31 4e 55 81 ac 77 d6 5f 11 19
9b 04 35 56 f1 d7 a3 c7 6b 3c 11 18 3b 59 24 a5 09 f2 8f e6 ed 97 f1
fb fa 9e ba bf 2c 1e 15 3c 6e 86 e3 45 70 ea e9 6f b1 86 0e 5e 0a 5a
3e 2a b3 77 1f e7 1c 4e 3d 06 fa 29 65 dc b9 99 e7 1d 0f 80 3e 89 d6
52 66 c8 25 2e 4c c9 78 9c 10 b3 6a c6 15 0e ba 94 e2 ea 78 a5 fc 3c
53 1e 0a 2d f4 f2 f7 4e a7 36 1d 2b 3d 19 39 26 0f 19 c2 79 60 52 23
a7 08 f7 13 12 b6 eb ad fe 6e ea c3 1f 66 e3 bc 45 95 a6 7b c8 83 b1
7f 37 d1 01 8c ff 28 c3 32 dd ef be 6c 5a a5 65 58 21 85 68 ab 98 02
ee ce a5 0f db 2f 95 3b 2a ef 7d ad 5b 6e 2f 84 15 21 b6 28 29 07 61
70 ec dd 47 75 61 9f 15 10 13 cc a8 30 eb 61 bd 96 03 34 fe 1e aa 03
63 cf b5 73 5c 90 4c 70 a2 39 d5 9e 9e 0b cb aa de 14 ee cc 86 bc 60
62 2c a7 9c ab 5c ab b2 f3 84 6e 64 8b 1e af 19 bd f0 ca a0 23 69 b9
65 5a bb 50 40 68 5a 32 3c 2a b4 b3 31 9e e9 d5 c0 21 b8 f7 9b 54 0b
19 87 5f a0 99 95 f7 99 7e 62 3d 7d a8 f8 37 88 9a 97 e3 2d 77 11 ed
93 5f 16 68 12 81 0e 35 88 29 c7 e6 1f d6 96 de df a1 78 58 ba 99 57
f5 84 a5 1b 22 72 63 9b 83 c3 ff 1a c2 46 96 cd b3 0a eb 53 2e 30 54
8f d9 48 e4 6d bc 31 28 58 eb f2 ef 34 c6 ff ea fe 28 ed 61 ee 7c 3c
73 5d 4a 14 d9 e8 64 b7 e3 42 10 5d 14 20 3e 13 e0 45 ee e2 b6 a3 aa
ab ea db 6c 4f 15 fa cb 4f d0 c7 42 f4 42 ef 6a bb b5 65 4f 3b 1d 41
cd 21 05 d8 1e 79 9e 86 85 4d c7 e4 4b 47 6a 3d 81 62 50 cf 62 a1 f2
5b 8d 26 46 fc 88 83 a0 c1 c7 b6 a3 7f 15 24 c3 69 cb 74 92 47 84 8a
0b 56 92 b2 85 09 5b bf 00 ad 19 48 9d 14 62 b1 74 23 82 0e 00 58 42
8d 2a 0c 55 f5 ea 1d ad f4 3e 23 3f 70 61 33 72 f0 92 8d 93 7e 41
Total number of hex digits is 4000.
{noformat}
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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[jira] Updated: (HADOOP-5052) Add an example for computing exact
digits of Pi
Posted by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo (Nicholas), SZE updated HADOOP-5052:
-------------------------------------------
Attachment: 5052_20090117_0.18.patch
5052_20090117_0.18.patch:
- Partition the digits so that all map tasks take approximate the same execution time
{noformat}
Number of Maps = 10
Number of Digits = 1000
Map #0: offset=0, size=464
Map #1: offset=464, size=120
Map #2: offset=584, size=84
Map #3: offset=668, size=68
Map #4: offset=736, size=56
Map #5: offset=792, size=52
Map #6: offset=844, size=44
Map #7: offset=888, size=40
Map #8: offset=928, size=36
Map #9: offset=964, size=36
{noformat}
- Convert hex representation of pi to decimal representation
{noformat}
Pi = 3.1415926535 8979323846 2643383279 5028841971 6939937510
5820974944 5923078164 0628620899 8628034825 3421170679
8214808651 3282306647 0938446095 5058223172 5359408128
4811174502 8410270193 8521105559 6446229489 5493038196
4428810975 6659334461 2847564823 3786783165 2712019091
4564856692 3460348610 4543266482 1339360726 0249141273
7245870066 0631558817 4881520920 9628292540 9171536436
7892590360 0113305305 4882046652 1384146951 9415116094
3305727036 5759591953 0921861173 8193261179 3105118548
0744623799 6274956735 1885752724 8912279381 8301194912
9833673362 4406566430 8602139494 6395224737 1907021798
6094370277 0539217176 2931767523 8467481846 7669405132
0005681271 4526356082 7785771342 7577896091 7363717872
1468440901 2249534301 4654958537 1050792279 6892589235
4201995611 2129021960 8640344181 5981362977 4771309960
5187072113 4999999837 2978049951 0597317328 1609631859
5024459455 3469083026 4252230825 3344685035 2619311881
7101000313 7838752886 5875332083 8142061717 7669147303
5982534904 2875546873 1159562863 8823537875 9375195778
1857780532 1712268066 1300192787 6611195909 2164201989
Total number of decimal digits is 1000.
{noformat}
> Add an example for computing exact digits of Pi
> -----------------------------------------------
>
> Key: HADOOP-5052
> URL: https://issues.apache.org/jira/browse/HADOOP-5052
> Project: Hadoop Core
> Issue Type: New Feature
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 5052_20090115_0.18.patch, 5052_20090117_0.18.patch
>
>
> It would be useful to add an example showing how to use Hadoop to do scientific computing. We should add an example for computing exact digits of Pi.
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