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https://issues.apache.org/jira/browse/BEAM-6120?focusedWorklogId=172873&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-172873
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ASF GitHub Bot logged work on BEAM-6120:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 06/Dec/18 22:48
            Start Date: 06/Dec/18 22:48
    Worklog Time Spent: 10m 
      Work Description: robertwb commented on a change in pull request #7127: 
[BEAM-6120] Support retrieval of large gbk iterables over the state API.
URL: https://github.com/apache/beam/pull/7127#discussion_r239643988
 
 

 ##########
 File path: sdks/python/apache_beam/coders/coder_impl.py
 ##########
 @@ -637,20 +637,33 @@ class SequenceCoderImpl(StreamCoderImpl):
     countX element(0) element(1) ... element(countX - 1)
     0
 
+  If writing to state is enabled, the final terminating 0 will instead be
+  repaced with::
+
+    -1
+    len(state_token)
 
 Review comment:
   I would rather keep other negative values for possible future expansion. 9 
bytes is inconsequential once this code is hit.

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 172873)
    Time Spent: 3h 10m  (was: 3h)

> Support retrieval of large gbk iterables over the state API.
> ------------------------------------------------------------
>
>                 Key: BEAM-6120
>                 URL: https://issues.apache.org/jira/browse/BEAM-6120
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-py-harness
>            Reporter: Robert Bradshaw
>            Assignee: Robert Bradshaw
>            Priority: Major
>          Time Spent: 3h 10m
>  Remaining Estimate: 0h
>




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