[ 
https://issues.apache.org/jira/browse/BEAM-11538?focusedWorklogId=529468&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-529468
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ASF GitHub Bot logged work on BEAM-11538:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 30/Dec/20 11:03
            Start Date: 30/Dec/20 11:03
    Worklog Time Spent: 10m 
      Work Description: Fokko opened a new pull request #13635:
URL: https://github.com/apache/beam/pull/13635


   **Please** add a meaningful description for your change here.
   
   A Deque is in certain situations faster than a List: 
https://stackoverflow.com/questions/6163166/why-is-arraydeque-better-than-linkedlist.
 When writing a custom CombineFn, appending is something that we often do, 
therefore I think it is a nice addition to the default encoders.
   
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 529468)
    Remaining Estimate: 0h
            Time Spent: 10m

> Add a Deque Encoder
> -------------------
>
>                 Key: BEAM-11538
>                 URL: https://issues.apache.org/jira/browse/BEAM-11538
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>    Affects Versions: 2.26.0
>            Reporter: Fokko Driesprong
>            Priority: P2
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Next to the List encoder, I think it is nice to have a Deque encode as well. 
> The Deque is more performant compared to Lists, and can be used in a 
> CombineFn.



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