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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1491) HDFSFileSource should be able to read the HADOOP_CONF_DIR(YARN_CONF_DIR) environment variable
Date Thu, 04 May 2017 06:14:04 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996232#comment-15996232
] 

ASF GitHub Bot commented on BEAM-1491:
--------------------------------------

GitHub user 397090770 opened a pull request:

    https://github.com/apache/beam/pull/2890

    [BEAM-1491]Identify HADOOP_CONF_DIR(or YARN_CONF_DIR) environment variables

    Be sure to do all of the following to help us incorporate your contribution
    quickly and easily:
    
     - [ ] Make sure the PR title is formatted like:
       `[BEAM-<Jira issue #>] Description of pull request`
     - [ ] Make sure tests pass via `mvn clean verify`.
     - [ ] Replace `<Jira issue #>` in the title with the actual Jira issue
           number, if there is one.
     - [ ] If this contribution is large, please file an Apache
           [Individual Contributor License Agreement](https://www.apache.org/licenses/icla.pdf).
    
    ---


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/397090770/beam BEAM-1491

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/beam/pull/2890.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2890
    
----
commit 9bd067d2a1d3b7210560e8edce2763fe3c000dba
Author: yangping.wu <yangping.wu@qunar.com>
Date:   2017-05-04T06:04:08Z

    [BEAM-1491]Identify HADOOP_CONF_DIR(or YARN_CONF_DIR) environment variables

commit 59e6302631a716da0472894fb0dfc866a770b533
Author: yangping.wu <yangping.wu@qunar.com>
Date:   2017-05-04T06:11:45Z

    [BEAM-1491]Identify HADOOP_CONF_DIR(or YARN_CONF_DIR) environment variables

----


> HDFSFileSource should be able to read the HADOOP_CONF_DIR(YARN_CONF_DIR) environment
variable
> ---------------------------------------------------------------------------------------------
>
>                 Key: BEAM-1491
>                 URL: https://issues.apache.org/jira/browse/BEAM-1491
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>    Affects Versions: 0.6.0
>            Reporter: wyp
>            Assignee: Jean-Baptiste Onofré
>
> Currently, if we want to read file store on HDFS, we will do it as follow:
> {code} 
> PRead.Bounded<KV<LongWritable, Text>> from = Read.from(HDFSFileSource.from("hdfs://hadoopserver:8020/tmp/data.txt",
TextInputFormat.class, LongWritable.class, Text.class));
> PCollection<KV<LongWritable, Text>> data = p.apply(from);
> {code}
> or
> {code}
> Configuration conf = new Configuration();
> conf.set("fs.default.name", "hdfs://hadoopserver:8020");
> PRead.Bounded<KV<LongWritable, Text>> from = Read.from(HDFSFileSource.from("/tmp/data.txt",
TextInputFormat.class, LongWritable.class, Text.class).withConfiguration(conf));
> PCollection<KV<LongWritable, Text>> data = p.apply(from);
> {code}
> As we have seen above, we must be set {{hdfs://hadoopserver:8020}} in the file path
> if we can initialize {{conf}} by reading {{HADOOP_CONF_DIR}}({{YARN_CONF_DIR}}) environmen
variable, then we can read HDFS file like this:
> {code}
> PRead.Bounded<KV<LongWritable, Text>> from = Read.from(HDFSFileSource.from("/tmp/data.txt",
TextInputFormat.class, LongWritable.class, Text.class));
> PCollection<KV<LongWritable, Text>> data = p.apply(from);
> {code}
> note we don't specify {{hdfs://hadoopserver:8020}} prefix, because the program read it
from  {{HADOOP_CONF_DIR}}({{YARN_CONF_DIR}}) environmen, and the program will read file from
HDFS.



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