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Posted to common-issues@hadoop.apache.org by "Matthew (JIRA)" <ji...@apache.org> on 2015/09/23 20:33:05 UTC

[jira] [Created] (HADOOP-12436) GlobPattern regex library has performance issues with wildcard characters

Matthew created HADOOP-12436:
--------------------------------

             Summary: GlobPattern regex library has performance issues with wildcard characters
                 Key: HADOOP-12436
                 URL: https://issues.apache.org/jira/browse/HADOOP-12436
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs
    Affects Versions: 2.7.1, 2.2.0
            Reporter: Matthew
            Assignee: Matthew


java.util.regex classes have performance problems with certain wildcard patterns.  Namely, consecutive * characters in a file name (not properly escaped as literals) will cause commands such as "hadoop fs -ls file******name" to consume 100% CPU and probably never return in a reasonable time (time scales with number of *'s). 

Here is an example:

{noformat}
hdfs dfs -ls '/tmp/job_1429571161900_4222-1430338332599-tda%2D%2D+******************************+++...%270%27%28Stage-1430338580443-39-2000-SUCCEEDED-production%2Dhigh-1430338340360.jhist'
{noformat}



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