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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 Tue, 02 May 2017 08:26:04 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15992537#comment-15992537
] 

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

Github user 397090770 closed the pull request at:

    https://github.com/apache/beam/pull/2759


> 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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