Hi!
It seems you are actually working on the Optimizer's representation of the
program. The optimizer (and the runtime as well) think about Flink programs
in terms of data flows, not data sets any more (that is only in the
Java/Scala API).
The Java API operations get translated to the data flow operators for
example in
"org.apache.flink.api.java.operators.SingleInputOperator#translateToDataFlow()".
Actually, even the Java API is in some sense only a fluid data flow builder
pattern. All DataSets are actually the results from operators and the
concrete implementations of the abstract data set class are the operator
classes.
Greetings,
Stephan
On Mon, Apr 27, 2015 at 2:51 PM, Amit Pawar <amitpawar5...@gmail.com> wrote:
> Hi
>
> For a given Operator<?>, it is easily possible to find the input and output
> TypeInformation<?>,which gives the datatype and other information of the
> dataset. For e.g.
>
> if(operator instanceof SingleInputOperator){
>
> inputTypes.add(((SingleInputOperator)operator).getOperatorInfo().getInputType());
> }
>
> For a given DAG connection, we can determine source and target, also in
> terms of Operator.
>
> Is it possible to determine on which dataset is the operator working on?
>
> Thanks and Regards
> Amit Pawar
>
>
> On Thu, Apr 23, 2015 at 3:01 PM, Stephan Ewen <se...@apache.org> wrote:
>
> > Okay, nice to hear!
> >
> > Ping us if you run into other trouble...
> >
> > On Thu, Apr 23, 2015 at 2:28 PM, Amit Pawar <amitpawar5...@gmail.com>
> > wrote:
> >
> > > Thanks Stephan.
> > > Using flink-dist jar solves the issue.
> > >
> > >
> > > Thanks and Regards
> > > Amit Pawar
> > >
> > >
> > > On Thu, Apr 23, 2015 at 2:02 PM, Stephan Ewen <se...@apache.org>
> wrote:
> > >
> > > > Hi!
> > > >
> > > > What you describe sounds pretty much like a version mixup -
> > NoSuchMethod
> > > > indicates one part of the code is out of sync with the other. Can you
> > > make
> > > > sure that you have all jars from the same Flink version in the
> > classpath?
> > > >
> > > > For the Optimizer Exception: The cause may be a similar issue
> (version
> > > > mixup) or a completely missing jar file. If you use the big jar file
> > from
> > > > flink-dist in version 0.9, does that error occur?
> > > >
> > > > Greetings,
> > > > Stephan
> > > >
> > > >
> > > > On Thu, Apr 23, 2015 at 2:01 AM, Amit Pawar <amitpawar5...@gmail.com
> >
> > > > wrote:
> > > >
> > > > > Many thanks Stephan.
> > > > > I followed your instructions and it was working fine when I had the
> > > > > required flink projects in the build path,
> > > > > later when I substituted it by adding respective dependencies with
> > the
> > > > > snapshots in pom, I am getting the below exception at
> > > > >
> > > > > OptimizedPlan opPlan = op.compile(env.createProgramPlan());
> > > > >
> > > > > Exception in thread "main"
> > > org.apache.flink.optimizer.CompilerException:
> > > > > Class 'org.apache.flink.compiler.postpass.JavaApiPostPass' is not
> an
> > > > > optimizer post-pass.
> > > > > at
> > > > >
> > > > >
> > > >
> > >
> >
> org.apache.flink.optimizer.Optimizer.getPostPassFromPlan(Optimizer.java:573)
> > > > > at org.apache.flink.optimizer.Optimizer.compile(Optimizer.java:402)
> > > > > at thesis.examples.SampleTest.main(SampleTest.java:189)
> > > > > Caused by: java.lang.ClassCastException: class
> > > > > org.apache.flink.compiler.postpass.JavaApiPostPass
> > > > > at java.lang.Class.asSubclass(Class.java:3208)
> > > > > at
> > > > >
> > > > >
> > > >
> > >
> >
> org.apache.flink.optimizer.Optimizer.getPostPassFromPlan(Optimizer.java:557)
> > > > > ... 2 more
> > > > >
> > > > > I can work around that by having the necessary flink projects in
> > > > > eclipse/build path, but then I face different issue of scala, No
> > such
> > > > > method exception on env.execute();
> > > > >
> > > > > Please advise.
> > > > >
> > > > > Thanks and Regards
> > > > > Amit Pawar
> > > > >
> > > > >
> > > > > On Mon, Mar 30, 2015 at 6:26 PM, Stephan Ewen <se...@apache.org>
> > > wrote:
> > > > >
> > > > > > Hi Amit!
> > > > > >
> > > > > > The DataSet API is basically a fluent builder for the internal
> DAG
> > of
> > > > > > operations, the "Plan". This plan is build when you call
> > > > "env.execute()".
> > > > > >
> > > > > > You can directly get the Plan by calling
> > > > > > ExecutionEnvironment#createProgramPlan()
> > > > > >
> > > > > > The JSON plan has in addition the information inserted by the
> > > Optimizer
> > > > > > (what partitioning to use where, what keys to use). This is
> called
> > > the
> > > > > > "OptimizedPlan".
> > > > > > To obtain that, you have to push the Plan through the Optimizer:
> > > > > > "OptimizedPlan op = new Optimizer(new DataStaristics(), new
> > > > > > DefaultCostEstimator()).compile(plan)"
> > > > > >
> > > > > > That optimized plan has everything in information for the
> > execution.
> > > > The
> > > > > > JSON is created from that OptimizedPlan via "new
> > > > > > PlanJSONDumpGenerator().getOptimizerPlanAsJSON(optimizedPlan)"
> > > > > >
> > > > > > Note: These classnames and instructions refer to Flink 0.9. For
> > > version
> > > > > > 0.8, the names are a bit different.
> > > > > >
> > > > > > Greetings,
> > > > > > Stephan
> > > > > >
> > > > > >
> > > > > >
> > > > > > On Mon, Mar 30, 2015 at 5:22 PM, Amit Pawar <
> > amitpawar5...@gmail.com
> > > >
> > > > > > wrote:
> > > > > >
> > > > > > > Hi
> > > > > > >
> > > > > > > I am trying to extract/retrieve the Flink execution plan. I
> > managed
> > > > to
> > > > > > get
> > > > > > > it as JSON string in following ways:
> > > > > > > 1. Using JAR - via PackagedProgram using getPreviewPlan() ; or
> > > > > > > 2. Directly in program - via ExecutionEnvironment's
> > > > getExecutionPlan()
> > > > > > >
> > > > > > > My question is - Is it possible to retrieve directly the Plan
> > > object?
> > > > > > > I tried for this but was not successful as submitting the jar
> > takes
> > > > us
> > > > > > into
> > > > > > > interactive mode, and in order to use the other mode,
> > > > > programEntryPoint,
> > > > > > > the main class needs to implement Program interface with
> getPlan
> > > > > method.
> > > > > > >
> > > > > > > Even if we manage to get the execution plan as a Plan object,
> > will
> > > it
> > > > > be
> > > > > > > different from what we have using JSON string? like in terms
> of -
> > > > > > > 1. What are the datatypes used in the dataset's tuple
> > > > > > > 2. On what key is the Join taking place
> > > > > > > 3. Filtering predicate
> > > > > > > 4. Field for Distinct and so on
> > > > > > > (JSON plan does have the operator tree but the contents field
> > > points
> > > > to
> > > > > > the
> > > > > > > line of code in the class, which is not that helpful)
> > > > > > >
> > > > > > > If not, is it possible (by some other way) to get the above
> > details
> > > > > just
> > > > > > by
> > > > > > > using the Flink job/jar as an input?
> > > > > > >
> > > > > > >
> > > > > > > Thanks and Regards
> > > > > > > Amit Pawar
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
