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https://issues.apache.org/jira/browse/BEAM-8335?focusedWorklogId=359069&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-359069
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ASF GitHub Bot logged work on BEAM-8335:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 13/Dec/19 01:57
            Start Date: 13/Dec/19 01:57
    Worklog Time Spent: 10m 
      Work Description: rohdesamuel commented on pull request #10368: 
[BEAM-8335] Modify PipelineInstrument to add TestStream for unbounded 
PCollections
URL: https://github.com/apache/beam/pull/10368#discussion_r357455812
 
 

 ##########
 File path: sdks/python/apache_beam/runners/interactive/pipeline_instrument.py
 ##########
 @@ -393,6 +398,45 @@ def _replace_with_cached_inputs(self, pipeline):
     cache, noop.
     """
 
+    # Find all cached unbounded PCollections.
+    class CacheableUnboundedPCollectionVisitor(PipelineVisitor):
+      def __init__(self, pin):
+        self._pin = pin
+        self.unbounded_pcolls = set()
+
+      def enter_composite_transform(self, transform_node):
+        self.visit_transform(transform_node)
+
+      def visit_transform(self, transform_node):
+        if transform_node.inputs:
+          for input_pcoll in transform_node.inputs:
+            key = self._pin.cache_key(input_pcoll)
+            if (key in self._pin._cached_pcoll_read and
+                not input_pcoll.is_bounded):
 
 Review comment:
   Great, thank you for being careful and thorough!
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 359069)
    Time Spent: 47h 40m  (was: 47.5h)

> Add streaming support to Interactive Beam
> -----------------------------------------
>
>                 Key: BEAM-8335
>                 URL: https://issues.apache.org/jira/browse/BEAM-8335
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-py-interactive
>            Reporter: Sam Rohde
>            Assignee: Sam Rohde
>            Priority: Major
>          Time Spent: 47h 40m
>  Remaining Estimate: 0h
>
> This issue tracks the work items to introduce streaming support to the 
> Interactive Beam experience. This will allow users to:
>  * Write and run a streaming job in IPython
>  * Automatically cache records from unbounded sources
>  * Add a replay experience that replays all cached records to simulate the 
> original pipeline execution
>  * Add controls to play/pause/stop/step individual elements from the cached 
> records
>  * Add ability to inspect/visualize unbounded PCollections



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