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Vinod Kumar Vavilapalli commented on HADOOP-15571: -------------------------------------------------- >From my limited understanding of all of this .... This is a regression from 2.x to 3.x. Essentially there were two ways to set umask in 2.x. # FileContext.setUMask(myUMask) // Previously per file-context # conf.set(fs.permissions.umask-mode, myUmask) // Global In 3.x, there is only one. Either (the configuration from a file) or (any-call by code anywhere in the same JVM for any file-context) will set umask for *all* file-systems. IMO and IIUC, we should support both - with the FileContext.setUMask() taking precedence if it was explicitly called. /cc [~ajisakaa], [~boky01], [~yufeigu], [~steve_l] for HADOOP-13440 & related patches. > After HADOOP-13440, multiple filesystems/file-contexts created with the same > Configuration object are forced to have the same umask > ----------------------------------------------------------------------------------------------------------------------------------- > > Key: HADOOP-15571 > URL: https://issues.apache.org/jira/browse/HADOOP-15571 > Project: Hadoop Common > Issue Type: Bug > Reporter: Vinod Kumar Vavilapalli > Priority: Critical > > Ran into a super hard-to-debug due to this. > h4. Issue > Configuration conf = new Configuration(); > fc1 = FileContext.getFileContext(uri1, conf); > fc2 = FileContext.getFileContext(uri2, conf); > fc.setUMask(umask_for_fc1); // Screws up umask for fc2 also! > This was not the case before HADOOP-13440. > h4. Symptoms: > h5. Scenario I ran into > When trying to localize a HDFS directory (hdfs:///my/dir/1.txt), NodeManager > tries to replicate the directory structure on the local file-system > ($yarn-local-dirs/filecache/my/dir/1.txt). > Now depending on whether NM has ever done a log-aggregation (completely > unrelated code that sets umask to be 137 for its own files on HDFS), the > directories /my and /my/dir on local-fs may have different permissions. In > the specific case where NM did log-aggregation, /my/dir was created with 137 > umask and so localization of 1.txt completely failed due to absent directory > executable permissions! > h5. Previous scenarios: > We ran into this before in test-cases and instead of fixing the root-cause, > we just fixed the test-cases: YARN-5679 / YARN-5749 -- 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