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Date: Tue, 11 Apr 2017 03:22:41 +0000 (UTC)
From: "yangping wu (JIRA)" <jira@apache.org>
To: commits@beam.apache.org
Message-ID: <JIRA.13043188.1487146100000.252934.1491880961659@Atlassian.JIRA>
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Subject: [jira] [Updated] (BEAM-1491) HDFSFileSource should be able to read
 the HADOOP_CONF_DIR(YARN_CONF_DIR) environment variable
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archived-at: Tue, 11 Apr 2017 03:22:46 -0000


     [ https://issues.apache.org/jira/browse/BEAM-1491?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:all-tabpanel ]

yangping wu updated BEAM-1491:
------------------------------
    Summary: HDFSFileSource should be able to read the HADOOP_CONF_DIR(YARN=
_CONF_DIR) environment variable  (was: HDFSFileSource should be able to rea=
d the HADOOP_CONF_DIR(YARN_CONF_DIR) environmen variable)

> 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: yangping wu
>            Assignee: Jean-Baptiste Onofr=C3=A9
>
> Currently, if we want to read file store on HDFS, we will do it as follow=
:
> {code}=20
> PRead.Bounded<KV<LongWritable, Text>> from =3D Read.from(HDFSFileSource.f=
rom("hdfs://hadoopserver:8020/tmp/data.txt", TextInputFormat.class, LongWri=
table.class, Text.class));
> PCollection<KV<LongWritable, Text>> data =3D p.apply(from);
> {code}
> or
> {code}
> Configuration conf =3D new Configuration();
> conf.set("fs.default.name", "hdfs://hadoopserver:8020");
> PRead.Bounded<KV<LongWritable, Text>> from =3D Read.from(HDFSFileSource.f=
rom("/tmp/data.txt", TextInputFormat.class, LongWritable.class, Text.class)=
.withConfiguration(conf));
> PCollection<KV<LongWritable, Text>> data =3D 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 =3D Read.from(HDFSFileSource.f=
rom("/tmp/data.txt", TextInputFormat.class, LongWritable.class, Text.class)=
);
> PCollection<KV<LongWritable, Text>> data =3D p.apply(from);
> {code}
> note we don't specify {{hdfs://hadoopserver:8020}} prefix, because the pr=
ogram read it from  {{HADOOP_CONF_DIR}}({{YARN_CONF_DIR}}) environmen, and =
the program will read file from HDFS.


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