[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Vinod Kumar Vavilapalli updated MAPREDUCE-3404: --- Resolution: Fixed Fix Version/s: (was: 0.23.0) Release Note: Corrected MR AM to honor speculative configuration and enable speculating either maps or reduces. Hadoop Flags: Reviewed Status: Resolved (was: Patch Available) ..oh, and the tests look good too. Just committed this to trunk and branch-0.23. Thanks Eric! On a side note, not caused by this patch, it is not correct that we increment the num_failed_maps counter when the speculation kills a task. Instead we should have a num_killed_maps. Separate issue, will file a ticket. > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > Fix For: 0.23.1, 0.24.0 > > Attachments: MAPREDUCE-3404.1.txt, MAPREDUCE-3404.2.txt > > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Eric Payne updated MAPREDUCE-3404: -- Fix Version/s: 0.24.0 > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > Fix For: 0.23.0, 0.23.1, 0.24.0 > > Attachments: MAPREDUCE-3404.1.txt, MAPREDUCE-3404.2.txt > > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Eric Payne updated MAPREDUCE-3404: -- Fix Version/s: 0.23.0 0.23.1 Status: Patch Available (was: Open) @Bobby, > 1. TestSpeculativeExecution.java: ... code commented out. Removed > 2. TestSpeculativeExecution.java: ... have mapper check the individual parts > of the ID though the APIs... Done > 3. TestSpeculativeExecution.java: ... don't call Thread.currentThread() ... Removed. > 4. TestSpeculativeExecution.java: ... remove tabs ... Done. > 5. MRAppMaster.java: ... Simplify boolean expression ... Done. > 6. TestSpeculativeExecution.java: ... Override speculator so that it will > cause speculation to happen ... Done. @Mahadev: > How do we make sure that if mapreduce.job.maps.speculative=false and > mapreduce.job.reduce.speculative=true, the maps dont get speculated and the > reduces gets speculated? I added a test case that covers speculation for reduces only. > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > Fix For: 0.23.1, 0.23.0 > > Attachments: MAPREDUCE-3404.1.txt, MAPREDUCE-3404.2.txt > > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Eric Payne updated MAPREDUCE-3404: -- Attachment: MAPREDUCE-3404.2.txt > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > Attachments: MAPREDUCE-3404.1.txt, MAPREDUCE-3404.2.txt > > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Arun C Murthy updated MAPREDUCE-3404: - Status: Open (was: Patch Available) Cancelling patch while Mahadev's comments are addressed. > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > Attachments: MAPREDUCE-3404.1.txt > > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Eric Payne updated MAPREDUCE-3404: -- Status: Patch Available (was: Open) In addition to the new unit test, I have successfully tested this patch on a 10-node cluster. > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > Attachments: MAPREDUCE-3404.1.txt > > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Eric Payne updated MAPREDUCE-3404: -- Attachment: MAPREDUCE-3404.1.txt > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > Attachments: MAPREDUCE-3404.1.txt > > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (MAPREDUCE-3404) Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false
[ https://issues.apache.org/jira/browse/MAPREDUCE-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Eric Payne updated MAPREDUCE-3404: -- Summary: Speculative Execution: speculative map tasks launched even if -Dmapreduce.map.speculative=false (was: Speculative Execution: speculative map tasks launched even if -Dmapreduce.job.maps.speculative.execution=false) > Speculative Execution: speculative map tasks launched even if > -Dmapreduce.map.speculative=false > --- > > Key: MAPREDUCE-3404 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3404 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: job submission, mrv2 >Affects Versions: 0.23.0 > Environment: Hadoop version is: Hadoop 0.23.0.1110031628 > 10 node test cluster >Reporter: patrick white >Assignee: Eric Payne >Priority: Critical > > When forcing a mapper to take significantly longer than other map tasks, > speculative map tasks are > launched even if the mapreduce.job.maps.speculative.execution parameter is > set to 'false'. > Testcase: ran default WordCount job with spec execution set to false for both > map and reduce but still saw a fifth mapper > task launch, ran job as follows: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=false > -Dmapreduce.job.reduces.speculative.execution=false > /tmp/test_file_of_words* /tmp/file_of_words.out > Input data was 4 text files >hdfs blocksize, with same word pattern plus one > diff text line in each file, fourth > file was 4 times as large as others: > hadoop --config fs -ls /tmp > Found 5 items > drwxr-xr-x - user hdfs 0 2011-10-20 16:17 /tmp/file_of_words.out > -rw-r--r-- 3 user hdfs 62800021 2011-10-20 14:45 /tmp/test_file_of_words1 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words2 > -rw-r--r-- 3 user hdfs 62800024 2011-10-20 14:46 /tmp/test_file_of_words3 > -rw-r--r-- 3 user hdfs 271708312 2011-10-20 15:50 /tmp/test_file_of_words4 > Job launched 5 mappers despite spec exec set to false, output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=273540 > SLOTS_MILLIS_REDUCES=212876 > Reran same case as above only set both spec exec params to 'true', same > results only this time the fifth task being > launched is expected since spec exec = true. > job run: > hadoop --config jar /tmp/testphw/wordcount.jar WordCount > -Dmapreduce.job.maps.speculative.execution=true > -Dmapreduce.job.reduces.speculative.execution=true > /tmp/test_file_of_words* /tmp/file_of_words.out > output snippet: > org.apache.hadoop.mapreduce.JobCounter > NUM_FAILED_MAPS=1 > TOTAL_LAUNCHED_MAPS=5 > TOTAL_LAUNCHED_REDUCES=1 > RACK_LOCAL_MAPS=5 > SLOTS_MILLIS_MAPS=279653 > SLOTS_MILLIS_REDUCES=211474 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
