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Chris Douglas commented on HADOOP-14600: ---------------------------------------- lgtm, but if you have cycles to verify the patch, then let's commit it as soon as you +1 it. > LocatedFileStatus constructor forces RawLocalFS to exec a process to get the > permissions > ---------------------------------------------------------------------------------------- > > Key: HADOOP-14600 > URL: https://issues.apache.org/jira/browse/HADOOP-14600 > Project: Hadoop Common > Issue Type: Bug > Components: fs > Affects Versions: 2.7.3 > Environment: file:// in a dir with many files > Reporter: Steve Loughran > Assignee: Ping Liu > Attachments: HADOOP-14600.001.patch, HADOOP-14600.002.patch, > HADOOP-14600.003.patch, HADOOP-14600.004.patch, HADOOP-14600.005.patch, > HADOOP-14600.006.patch, HADOOP-14600.007.patch, HADOOP-14600.008.patch, > HADOOP-14600.009.patch, TestRawLocalFileSystemContract.java > > > Reported in SPARK-21137. a {{FileSystem.listStatus}} call really craws > against the local FS, because {{FileStatus.getPemissions}} call forces > {{DeprecatedRawLocalFileStatus}} tp spawn a process to read the real UGI > values. > That is: for every other FS, what's a field lookup or even a no-op, on the > local FS it's a process exec/spawn, with all the costs. This gets expensive > if you have many files. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org