[ https://issues.apache.org/jira/browse/HADOOP-16083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Siyao Meng updated HADOOP-16083: -------------------------------- Attachment: HADOOP-16083.001.patch Status: Patch Available (was: Open) > DistCp shouldn't always overwrite the target file when checksums match > ---------------------------------------------------------------------- > > Key: HADOOP-16083 > URL: https://issues.apache.org/jira/browse/HADOOP-16083 > Project: Hadoop Common > Issue Type: Improvement > Components: tools/distcp > Affects Versions: 3.1.1, 3.2.0, 3.3.0 > Reporter: Siyao Meng > Assignee: Siyao Meng > Priority: Major > Attachments: HADOOP-16083.001.patch > > > {code:java|title=CopyMapper#setup} > ... > try { > overWrite = overWrite || > targetFS.getFileStatus(targetFinalPath).isFile(); > } catch (FileNotFoundException ignored) { > } > ... > {code} > The above code overrides config key "overWrite" to "true" when the target > path is a file. Therefore, unnecessary transfer happens when the source and > target file have the same checksums. > My suggestion is: remove the code above. If the user insists to overwrite, > just add -overwrite in the options: > {code:bash|title=DistCp command with -overwrite option} > hadoop distcp -overwrite hdfs://localhost:64464/source/5/6.txt > hdfs://localhost:64464/target/5/6.txt > {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org