[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Olga Natkovich updated PIG-1249: Release Note: In the previous versions of Pig, if the number of reducers was not specified (via PARALLEL or default_parallelism), the value of 1 was used which in many cases was not a good choice and caused severe performance problems. In Pig 0.8.0, a simple heuristic is used to come up with a better number based on the size of the input data. There are several parameters that the user can control: pig.exec.reducers.bytes.per.reducer - define number of input bytes per reduce; default value is 1000*1000*1000 (1GB) pig.exec.reducers.max - defines the upper bound on the number of reducers; default is 999 The formula is very simple: #reducers = MIN (pig.exec.reducers.max, total input size (in bytes) / bytes per reducer. This is a very simplistic formula that we would need to improve over time. Note, that the computed value takes all inputs within the script into account and applies the computed value to all the jobs within Pig script. Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249-4.patch, PIG-1249.patch, PIG-1249_5.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Olga Natkovich updated PIG-1249: Release Note: In the previous versions of Pig, if the number of reducers was not specified (via PARALLEL or default_parallel), the value of 1 was used which in many cases was not a good choice and caused severe performance problems. In Pig 0.8.0, a simple heuristic is used to come up with a better number based on the size of the input data. There are several parameters that the user can control: pig.exec.reducers.bytes.per.reducer - define number of input bytes per reduce; default value is 1000*1000*1000 (1GB) pig.exec.reducers.max - defines the upper bound on the number of reducers; default is 999 The formula is very simple: #reducers = MIN (pig.exec.reducers.max, total input size (in bytes) / bytes per reducer. This is a very simplistic formula that we would need to improve over time. Note, that the computed value takes all inputs within the script into account and applies the computed value to all the jobs within Pig script. Note that this is not a backward compatible change and set default_parallel to restore the value to 1 was: In the previous versions of Pig, if the number of reducers was not specified (via PARALLEL or default_parallelism), the value of 1 was used which in many cases was not a good choice and caused severe performance problems. In Pig 0.8.0, a simple heuristic is used to come up with a better number based on the size of the input data. There are several parameters that the user can control: pig.exec.reducers.bytes.per.reducer - define number of input bytes per reduce; default value is 1000*1000*1000 (1GB) pig.exec.reducers.max - defines the upper bound on the number of reducers; default is 999 The formula is very simple: #reducers = MIN (pig.exec.reducers.max, total input size (in bytes) / bytes per reducer. This is a very simplistic formula that we would need to improve over time. Note, that the computed value takes all inputs within the script into account and applies the computed value to all the jobs within Pig script. Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249-4.patch, PIG-1249.patch, PIG-1249_5.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Olga Natkovich updated PIG-1249: Status: Resolved (was: Patch Available) Resolution: Fixed Patch committed. Thanks Jeff! Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249-4.patch, PIG-1249.patch, PIG-1249_5.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jeff Zhang updated PIG-1249: Attachment: PIG-1249_5.patch Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249-4.patch, PIG-1249.patch, PIG-1249_5.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Alan Gates updated PIG-1249: Status: Open (was: Patch Available) The latest patch doesn't apply because of a merge conflict. I'll attach a patch that addresses this. Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Alan Gates updated PIG-1249: Attachment: PIG-1249-4.patch Patch with merge conflict resolution. Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249-4.patch, PIG-1249.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Alan Gates updated PIG-1249: Status: Patch Available (was: Open) Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249-4.patch, PIG-1249.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jeff Zhang updated PIG-1249: Attachment: PIG_1249_3.patch Update the patch, including testcase of non-dfs input and do path checking when doing estimation Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249.patch, PIG_1249_2.patch, PIG_1249_3.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jeff Zhang updated PIG-1249: Status: Open (was: Patch Available) Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249.patch, PIG_1249_2.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jeff Zhang updated PIG-1249: Attachment: PIG-1249.patch The current idea is borrowed from hive, use the input file size to estimate the reducer number. Two parameters can been set for this purpose pig.exec.reducers.bytes.per.reducer // the number of bytes of input for each reducer pig.exec.reducers.max // the max number of reducer number This only work for hdfs, won't work for other data source such as hbase or cassandra. Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jeff Zhang updated PIG-1249: Status: Patch Available (was: Open) Affects Version/s: 0.8.0 Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Affects Versions: 0.8.0 Reporter: Arun C Murthy Assignee: Jeff Zhang Priority: Critical Fix For: 0.8.0 Attachments: PIG-1249.patch It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Updated: (PIG-1249) Safe-guards against misconfigured Pig scripts without PARALLEL keyword
[ https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Olga Natkovich updated PIG-1249: Fix Version/s: 0.8.0 Safe-guards against misconfigured Pig scripts without PARALLEL keyword -- Key: PIG-1249 URL: https://issues.apache.org/jira/browse/PIG-1249 Project: Pig Issue Type: Improvement Reporter: Arun C Murthy Priority: Critical Fix For: 0.8.0 It would be *very* useful for Pig to have safe-guards against naive scripts which process a *lot* of data without the use of PARALLEL keyword. We've seen a fair number of instances where naive users process huge data-sets (10TB) with badly mis-configured #reduces e.g. 1 reduce. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
