[jira] [Created] (MESOS-1711) Create method for users to identify HDFS compatible protocols in fetcher.cpp

["John Omernik (JIRA)" <ji...@apache.org>]

John Omernik created MESOS-1711:
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             Summary: Create method for users to identify HDFS compatible protocols in fetcher.cpp
                 Key: MESOS-1711
                 URL: https://issues.apache.org/jira/browse/MESOS-1711
             Project: Mesos
          Issue Type: Improvement
          Components: general
    Affects Versions: 0.19.1
         Environment: All
            Reporter: John Omernik
            Priority: Minor
             Fix For: 0.21.0


In fetcher.cpp, the code to get the Mesos packages uses a hard coded list of protocols to determine if the Hadoop copytoLocal method is used or if another method (such as standard filecopy).  This limits the addition of new protocols that are HDFS compatible until the next release of Mesos. Tachyon Filesystem (tachyonfs://), MapR FS (maprfs://) and glusterfs:// are three examples that could make use of this. 

Instead of just adding those file systems in the hard coded list, I recommend following the lead of the Tachyon Project.  In tachyon-0.6.0-SNAPSHOT, they have added an environment variable of allowed hdfs compatible protocols. This comma-separated list allows the user/admin to specify which protocols are HDFS compatible, without hard coding it in the fetcher.cpp.   

I don't have access to the Tachyon issues list for linking, but the code is on line 75 of 

https://github.com/amplab/tachyon/blob/master/core/src/main/java/tachyon/UnderFileSystem.java





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