[ https://issues.apache.org/jira/browse/HADOOP-8989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Allen updated HADOOP-8989: ----------------------------------- Status: Patch Available (was: Open) > hadoop dfs -find feature > ------------------------ > > Key: HADOOP-8989 > URL: https://issues.apache.org/jira/browse/HADOOP-8989 > Project: Hadoop Common > Issue Type: New Feature > Reporter: Marco Nicosia > Assignee: Jonathan Allen > Attachments: HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, > HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, > HADOOP-8989.patch, HADOOP-8989.patch > > > Both sysadmins and users make frequent use of the unix 'find' command, but > Hadoop has no correlate. Without this, users are writing scripts which make > heavy use of hadoop dfs -lsr, and implementing find one-offs. I think hdfs > -lsr is somewhat taxing on the NameNode, and a really slow experience on the > client side. Possibly an in-NameNode find operation would be only a bit more > taxing on the NameNode, but significantly faster from the client's point of > view? > The minimum set of options I can think of which would make a Hadoop find > command generally useful is (in priority order): > * -type (file or directory, for now) > * -atime/-ctime-mtime (... and -creationtime?) (both + and - arguments) > * -print0 (for piping to xargs -0) > * -depth > * -owner/-group (and -nouser/-nogroup) > * -name (allowing for shell pattern, or even regex?) > * -perm > * -size > One possible special case, but could possibly be really cool if it ran from > within the NameNode: > * -delete > The "hadoop dfs -lsr | hadoop dfs -rm" cycle is really, really slow. > Lower priority, some people do use operators, mostly to execute -or searches > such as: > * find / \(-nouser -or -nogroup\) > Finally, I thought I'd include a link to the [Posix spec for > find|http://www.opengroup.org/onlinepubs/009695399/utilities/find.html] -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira