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https://issues.apache.org/jira/browse/FLINK-4098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15346600#comment-15346600
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Geoffrey Mon commented on FLINK-4098:
-------------------------------------

Here's a jobmanager log for a simple Python iteration program that iterates 
each number in a Dataset:

2016-06-23 11:14:51,900 INFO  org.apache.flink.runtime.jobmanager.JobManager    
            - Status of job ac35083fec7c77cc1707245563aed90d (Flink Java Job at 
Thu Jun 23 11:14:51 EDT 2016) changed to RUNNING.
<snip>
2016-06-23 11:14:52,266 INFO  org.apache.flink.runtime.taskmanager.Task         
            - Obtaining local cache file for 'flink'
2016-06-23 11:14:52,267 INFO  org.apache.flink.runtime.taskmanager.Task         
            - PartialSolution (Bulk Iteration) (1/1) switched to RUNNING
2016-06-23 11:14:52,268 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - PartialSolution 
(Bulk Iteration) (1/1) (5c0ff0bae3952df909198ebf94f51dcf) switched from 
DEPLOYING to RUNNING
2016-06-23 11:14:53,053 INFO  
org.apache.flink.runtime.iterative.task.IterationHeadTask     - starting 
iteration [1]:  PartialSolution (Bulk Iteration) (1/1)
2016-06-23 11:14:53,059 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - MapPartition 
(PythonMap) (1/1) (107be54ae5b60776dc35cc2ace83a2f0) switched from CREATED to 
SCHEDULED
2016-06-23 11:14:53,059 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - MapPartition 
(PythonMap) (1/1) (107be54ae5b60776dc35cc2ace83a2f0) switched from SCHEDULED to 
DEPLOYING
<snip>
2016-06-23 11:14:53,077 INFO  org.apache.flink.runtime.taskmanager.Task         
            - MapPartition (PythonMap) (1/1) switched to RUNNING
2016-06-23 11:14:53,078 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - MapPartition 
(PythonMap) (1/1) (107be54ae5b60776dc35cc2ace83a2f0) switched from DEPLOYING to 
RUNNING
2016-06-23 11:14:53,155 INFO  
org.apache.flink.runtime.iterative.task.IterationTailTask     - starting 
iteration [1]:  MapPartition (PythonMap) (1/1)

The program does not proceed past that point and appears to hang without any 
errors.

> Iteration support in Python API
> -------------------------------
>
>                 Key: FLINK-4098
>                 URL: https://issues.apache.org/jira/browse/FLINK-4098
>             Project: Flink
>          Issue Type: New Feature
>          Components: Python API
>    Affects Versions: 1.0.2
>            Reporter: Geoffrey Mon
>            Priority: Minor
>
> Bulk and delta iterations are not supported in the Python API. Currently 
> working on this at https://github.com/GEOFBOT/flink



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