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From "Stephen Sisk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2031) Hadoop FileSystem needs to receive Hadoop Configuration through PipelineOptions
Date Tue, 25 Apr 2017 22:46:04 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15983776#comment-15983776
] 

Stephen Sisk commented on BEAM-2031:
------------------------------------

We need to allow users to pass in Configuration for hadoop - it's the way to set up connection
info/etc.. (Configuration is the hadoop class that manages this - kinda sorta similar to PipelineOptions,
but it is more like a generic bag than ours)

>From a reading of the Configuration source code, Configuration objects can store int/float/bool/etc...,
but those are ultimately stored as strings.

In both scenarios it seems useful to handle the configuration as a simple flat json map, so
the user would pass in the configuration like so:

--hdfsConfiguration={
  'fs.default.name': 'hdfs://my-host:8020/,
  'another-key': 'value',
  'a-third-key': 'another-value'} 

in line in a larger commandline:
mvn compile exec:java -Dexec.mainClass=org.apache.beam.examples.WordCount \
     -Dexec.args="--runner=DataflowRunner  \
          --inputFile=hdfs://my-host/shakespeare/* --output=hdfs://my-host/counts \
          --hdfsConfiguration={'fs.default.name': 'hdfs://my-host:8020/, 'another-key': 'value',
'a-third-key': 'another-value'} \
     -Pdataflow-runner

I propose handling the PipelineOption type as Map<String, String> and then we call set
for each key/value pair.

I'm going to test this out to see if there are any holes in my understanding of how this all
works.

cc [~davor]

> Hadoop FileSystem needs to receive Hadoop Configuration through PipelineOptions
> -------------------------------------------------------------------------------
>
>                 Key: BEAM-2031
>                 URL: https://issues.apache.org/jira/browse/BEAM-2031
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-java-extensions
>            Reporter: Stephen Sisk
>            Assignee: Stephen Sisk
>             Fix For: First stable release
>
>
> Since Beam FileSystem objects are configured via PipelineOptions, we need to pass a Hadoop
Configuration through PipelineOptions. I think that's very solvable, but it does seem semi-complicated.
> cc [~peihe0@gmail.com] I believe you mentioned in the past that you had an answer to
this - is that written down anywhere?



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