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https://issues.apache.org/jira/browse/BEAM-8335?focusedWorklogId=335669&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-335669
]
ASF GitHub Bot logged work on BEAM-8335:
----------------------------------------
Author: ASF GitHub Bot
Created on: 29/Oct/19 18:31
Start Date: 29/Oct/19 18:31
Worklog Time Spent: 10m
Work Description: robertwb commented on pull request #9720: [BEAM-8335]
Add initial modules for interactive streaming support
URL: https://github.com/apache/beam/pull/9720#discussion_r340218445
##########
File path:
sdks/python/apache_beam/runners/interactive/caching/streaming_cache.py
##########
@@ -0,0 +1,124 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from __future__ import absolute_import
+
+from apache_beam.portability.api.beam_interactive_api_pb2 import
InteractiveStreamHeader
+from apache_beam.portability.api.beam_interactive_api_pb2 import
InteractiveStreamRecord
+from apache_beam.portability.api.beam_runner_api_pb2 import TestStreamPayload
+from apache_beam.utils import timestamp
+from apache_beam.utils.timestamp import Timestamp
+
+
+class StreamingCache(object):
+ """Abstraction that holds the logic for reading and writing to cache.
+ """
+ def __init__(self, readers):
+ self._readers = readers
+
+ class Reader(object):
+ """Abstraction that reads from PCollection readers.
+
+ This class is an Abstraction layer over multiple PCollection readers to be
+ used for supplying the Interactive Service with TestStream events.
+
+ This class is also responsible for holding the state of the clock,
injecting
+ clock advancement events, and watermark advancement events.
+ """
+ def __init__(self, readers):
+ self._timestamp = Timestamp.of(0)
+ self._readers = {}
+ self._headers = {}
+ readers = [r.read() for r in readers]
+
+ # The header allows for metadata about an entire stream, so that the data
+ # isn't copied per record.
+ for r in readers:
+ header = InteractiveStreamHeader()
Review comment:
It always feel a bit odd to have a non-homogeneous iterator, where the first
element is of a different type. Especially as this `Reader` does not have the
same interface as its (sub)`readers`.
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Issue Time Tracking
-------------------
Worklog Id: (was: 335669)
Time Spent: 11h 50m (was: 11h 40m)
> 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: 11h 50m
> 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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