[jira] [Commented] (HBASE-4914) Enhance MapReduce TableInputFormat to Support N-mappers per Region
[ https://issues.apache.org/jira/browse/HBASE-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13235650#comment-13235650 ] Lars Hofhansl commented on HBASE-4914: -- Please comment today on why this is a blocker for 0.94. Otherwise I'll move this out of 0.94. Enhance MapReduce TableInputFormat to Support N-mappers per Region -- Key: HBASE-4914 URL: https://issues.apache.org/jira/browse/HBASE-4914 Project: HBase Issue Type: Sub-task Components: client, regionserver Reporter: Nicolas Spiegelberg Priority: Blocker Fix For: 0.94.0 Current TableInputFormat based MR jobs create exactly one mapper per region where each mapper sets one Scan with appropriate start/stop row keys. This change allows jobs to be run with any number of mappers per region, so that when a mapper fails, there will be less data to be reprocessed. -- 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] [Commented] (HBASE-4914) Enhance MapReduce TableInputFormat to Support N-mappers per Region
[ https://issues.apache.org/jira/browse/HBASE-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13234505#comment-13234505 ] Lars Hofhansl commented on HBASE-4914: -- Again, this does not look like a 0.94 blocker. Enhance MapReduce TableInputFormat to Support N-mappers per Region -- Key: HBASE-4914 URL: https://issues.apache.org/jira/browse/HBASE-4914 Project: HBase Issue Type: Sub-task Components: client, regionserver Reporter: Nicolas Spiegelberg Priority: Blocker Fix For: 0.94.0 Current TableInputFormat based MR jobs create exactly one mapper per region where each mapper sets one Scan with appropriate start/stop row keys. This change allows jobs to be run with any number of mappers per region, so that when a mapper fails, there will be less data to be reprocessed. -- 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] [Commented] (HBASE-4914) Enhance MapReduce TableInputFormat to Support N-mappers per Region
[ https://issues.apache.org/jira/browse/HBASE-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13231008#comment-13231008 ] Cosmin Lehene commented on HBASE-4914: -- Hadoop 0.20 doesn't behave well with large number of map tasks, so we implemented a N-Regions per map (through a splits_per_map property). I guess ideally we should be able to specify a min/max number of map tasks as well and have these two happen implicitly, perhaps with some sane thresholds. Enhance MapReduce TableInputFormat to Support N-mappers per Region -- Key: HBASE-4914 URL: https://issues.apache.org/jira/browse/HBASE-4914 Project: HBase Issue Type: Sub-task Components: client, regionserver Reporter: Nicolas Spiegelberg Priority: Blocker Fix For: 0.94.0 Current TableInputFormat based MR jobs create exactly one mapper per region where each mapper sets one Scan with appropriate start/stop row keys. This change allows jobs to be run with any number of mappers per region, so that when a mapper fails, there will be less data to be reprocessed. -- 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
