[ https://issues.apache.org/jira/browse/MAPREDUCE-5649?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gera Shegalov updated MAPREDUCE-5649: ------------------------------------- Target Version/s: 2.8.0 Status: Patch Available (was: Open) 001 for review, combining with MAPREDUCE-4883 > Reduce cannot use more than 2G memory for the final merge > ---------------------------------------------------------- > > Key: MAPREDUCE-5649 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-5649 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: mrv2 > Reporter: stanley shi > Assignee: Gera Shegalov > Attachments: MAPREDUCE-5649.001.patch > > > In the org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.java file, in > the finalMerge method: > int maxInMemReduce = (int)Math.min( > Runtime.getRuntime().maxMemory() * maxRedPer, Integer.MAX_VALUE); > > This means no matter how much memory user has, reducer will not retain more > than 2G data in memory before the reduce phase starts. -- This message was sent by Atlassian JIRA (v6.3.4#6332)