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From "Ufuk Celebi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2603) Flink hangs before starting execution
Date Tue, 01 Sep 2015 19:40:45 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14725942#comment-14725942
] 

Ufuk Celebi commented on FLINK-2603:
------------------------------------

In this case, you should be able to work around this by generating the numbers on the workers
instead of creating them at the client and shipping them:

{code}
env.generateSequence(0, count).output(new DiscardingOutputFormat<Long>());
{code}

> Flink hangs before starting execution
> -------------------------------------
>
>                 Key: FLINK-2603
>                 URL: https://issues.apache.org/jira/browse/FLINK-2603
>             Project: Flink
>          Issue Type: Bug
>          Components: Distributed Runtime
>    Affects Versions: master, 0.9.1
>            Reporter: Greg Hogan
>
> The following simple application created from Flink's Java quickstart will hang before
execution if the data size is to large. I have tested this on both 0.9.1 and master (7364ce18)
and the threshold occurs with
>   $ ./bin/flink run /path/to/blocks/target/blocks-1.0-SNAPSHOT.jar 19
> running in a few seconds while
>   $ ./bin/flink run /path/to/blocks/target/blocks-1.0-SNAPSHOT.jar 20
> seemingly hangs forever.
> I first put this together two months ago so if it is a bug it is not a new bug.
> {code}
> package blocks;
> import java.util.ArrayList;
> import java.util.List;
> import org.apache.flink.api.java.ExecutionEnvironment;
> import org.apache.flink.api.java.io.DiscardingOutputFormat;
> public class Job {
>     public static void main(String[] args) throws Exception {
>         // set up the execution environment
>         final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
>         List<Long> data = new ArrayList<>();
>         int count = 1 << Integer.valueOf(args[0]);
>         
>         for (int i = 0 ; i < count ; i++) {
>             data.add(0L);
>         }
>         env.fromCollection(data).output(new DiscardingOutputFormat());
>         System.out.println("Ready to execute ...");
>         
>         // execute program
>         env.execute("Flink Java API Skeleton");
>     }
> }
> {code}



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