[ https://issues.apache.org/jira/browse/HADOOP-11794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yongjun Zhang updated HADOOP-11794: ----------------------------------- Comment: was deleted (was: Rev 005 to address checkstyle issue. The javadoc ones are pre-existing largely. We can have a separate jira to fix. Thanks. ) > distcp can copy blocks in parallel > ---------------------------------- > > Key: HADOOP-11794 > URL: https://issues.apache.org/jira/browse/HADOOP-11794 > Project: Hadoop Common > Issue Type: Improvement > Components: tools/distcp > Affects Versions: 0.21.0 > Reporter: dhruba borthakur > Assignee: Yongjun Zhang > Attachments: HADOOP-11794.001.patch, HADOOP-11794.002.patch, > HADOOP-11794.003.patch, HADOOP-11794.004.patch, HADOOP-11794.005.patch, > MAPREDUCE-2257.patch > > > The minimum unit of work for a distcp task is a file. We have files that are > greater than 1 TB with a block size of 1 GB. If we use distcp to copy these > files, the tasks either take a long long long time or finally fails. A better > way for distcp would be to copy all the source blocks in parallel, and then > stich the blocks back to files at the destination via the HDFS Concat API > (HDFS-222) -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org