[jira] [Created] (FLINK-2249) ExecutionEnvironment: Ignore calls to execute() if no data sinks defined

[Shang Yuanchun (Jira)]

Maximilian Michels created FLINK-2249:
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             Summary: ExecutionEnvironment: Ignore calls to execute() if no data sinks defined
                 Key: FLINK-2249
                 URL: https://issues.apache.org/jira/browse/FLINK-2249
             Project: Flink
          Issue Type: Improvement
          Components: Java API, Scala API
    Affects Versions: 0.9
            Reporter: Maximilian Michels


The basic skeleton of a Flink program looks like this:

{code}
ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

// bootstrap DataSet
DataSet<..> ds = env.fromElements(1,2,3,4);
// perform transformations
..
// define sinks, e.g.
ds.writeToTextFile("/some/path");
// execute
env.execute()
{code}

First thing users do is to change {{ds.writeToTextFile("/some/path");}} into {{ds.print();}}. But that fails with an Exception ("No new data sinks defined...").

In FLINK-2026 we made this exception message easier to understand. However, users still don't understand what is happening. Especially because they see Flink executing and then failing.

I propose to ignore calls to execute() when no sinks are defined. Instead, we should just print a warning: "Detected call to execute without any data sinks. Not executing."





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