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From "huangjianhuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2995) can't read/write hdfs in Flink CLUSTER(Standalone)
Date Thu, 28 Sep 2017 14:02:00 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16184216#comment-16184216
] 

huangjianhuang commented on BEAM-2995:
--------------------------------------

yes, i've read BEAM-2457 before, and tried what you suggested (with HADOOP_CONF_DIR), but
make no difference.
i started my cluster with only one host(localhost), by shell command: FLINK_DIR/bin/start-cluster.sh

BTW, i access HDFS with HbaseIO now. it works fine on flink cluster;)

> can't read/write hdfs in Flink CLUSTER(Standalone)
> --------------------------------------------------
>
>                 Key: BEAM-2995
>                 URL: https://issues.apache.org/jira/browse/BEAM-2995
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>    Affects Versions: 2.2.0
>            Reporter: huangjianhuang
>            Assignee: Aljoscha Krettek
>
> i just write a simple demo like:
> {code:java}
>         Configuration conf = new Configuration();
>         conf.set("fs.default.name", "hdfs://localhost:9000");
> //other codes
>         p.apply("ReadLines", TextIO.read().from("hdfs://localhost:9000/tmp/words"))
>                 .apply(TextIO.write().to("hdfs://localhost:9000/tmp/hdfsout"));
> {code}
> it works in flink local model with cmd:
> {code:java}
> mvn exec:java -Dexec.mainClass=com.joe.FlinkWithHDFS     -Pflink-runner     -Dexec.args="--runner=FlinkRunner
--filesToStage=target/flinkBeam-2.2.0-SNAPSHOT-shaded.jar"
> {code}
> but not works in CLUSTER mode:
> {code:java}
> mvn exec:java -Dexec.mainClass=com.joe.FlinkWithHDFS     -Pflink-runner     -Dexec.args="--runner=FlinkRunner
--filesToStage=target/flinkBeam-2.2.0-SNAPSHOT-shaded.jar --flinkMaster=localhost:6123 "
> {code}
> it seems the flink cluster regard the hdfs as local file system. 
> The input log from flink-jobmanger.log is:
> {code:java}
> 2017-09-27 20:17:37,962 INFO  org.apache.flink.runtime.jobmanager.JobManager        
       - Successfully ran initialization on master in 136 ms.
> 2017-09-27 20:17:37,968 INFO  org.apache.beam.sdk.io.FileBasedSource                
       - {color:red}Filepattern hdfs://localhost:9000/tmp/words2 matched 0 files with total
size 0{color}
> 2017-09-27 20:17:37,968 INFO  org.apache.beam.sdk.io.FileBasedSource                
       - Splitting filepattern hdfs://localhost:9000/tmp/words2 into bundles of size 0 took
0 ms and produced 0 files a
> nd 0 bundles
> {code}
> The output  error message is :
> {code:java}
> Caused by: java.lang.ClassCastException: {color:red}org.apache.beam.sdk.io.hdfs.HadoopResourceId
cannot be cast to org.apache.beam.sdk.io.LocalResourceId{color}
>         at org.apache.beam.sdk.io.LocalFileSystem.create(LocalFileSystem.java:77)
>         at org.apache.beam.sdk.io.FileSystems.create(FileSystems.java:256)
>         at org.apache.beam.sdk.io.FileSystems.create(FileSystems.java:243)
>         at org.apache.beam.sdk.io.FileBasedSink$Writer.open(FileBasedSink.java:922)
>         at org.apache.beam.sdk.io.FileBasedSink$Writer.openUnwindowed(FileBasedSink.java:884)
>         at org.apache.beam.sdk.io.WriteFiles.finalizeForDestinationFillEmptyShards(WriteFiles.java:909)
>         at org.apache.beam.sdk.io.WriteFiles.access$900(WriteFiles.java:110)
>         at org.apache.beam.sdk.io.WriteFiles$2.processElement(WriteFiles.java:858)
> {code}
> can somebody help me, i've try all the way just can't work it out [cry]
> https://issues.apache.org/jira/browse/BEAM-2457



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