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From "Ping Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14600) LocatedFileStatus constructor forces RawLocalFS to exec a process to get the permissions
Date Tue, 03 Oct 2017 01:19:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ping Liu updated HADOOP-14600:
------------------------------
    Attachment: HADOOP-14600.004.patch

=> Fixed license issue
        - added ASF license header to newly added Helper.java

=> Fixed deprecation issue
        - added Suppression anotation in TestRawLocalFileSystemContract.testPermission()

=> Fixed leftover test directory and file, which should have be cleaned up
        - changed to use test base directory (getTestBaseDir()) in TestRawLocalFileSystemContract.testPermission()
        - this directory will be automatically recycled in tearDown()

Please note that there are totally three test failures as follows.

{quote}Tests in error: 
  TestKDiag.testKeytabAndPrincipal:162->kdiag:119 ? KerberosAuth Login failure f...
  TestKDiag.testFileOutput:186->kdiag:119 ? KerberosAuth Login failure for user:...
  TestKDiag.testLoadResource:196->kdiag:119 ? KerberosAuth Login failure for use...

Tests run: 3927, Failures: 0, Errors: 3, Skipped: 206{quote}

The failures are all from TestKDiag which is not related to HADOOP-14600.

> 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, 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.



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