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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2021/07/27 16:24:43 UTC
[GitHub] [beam] lostluck opened a new pull request #15227: Clarify PCollection immutability.
lostluck opened a new pull request #15227:
URL: https://github.com/apache/beam/pull/15227
Clarify a practical matter about Beam PCollections being immutable. Users have often taken that to mean that each DoFn ProcessElement call or similar gets their own copy of an element, pointing to this section as justification.
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`ValidatesRunner` compliance status (on master branch)
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[GitHub] [beam] lostluck commented on a change in pull request #15227: Clarify PCollection immutability.
Posted by GitBox <gi...@apache.org>.
lostluck commented on a change in pull request #15227:
URL: https://github.com/apache/beam/pull/15227#discussion_r695187919
##########
File path: website/www/site/content/en/documentation/programming-guide.md
##########
@@ -448,6 +448,12 @@ individual elements. A Beam Transform might process each element of a
`PCollection` and generate new pipeline data (as a new `PCollection`), *but it
does not consume or modify the original input collection*.
+> **Note:** Beam SDKs avoid unnecessary copying of elements, so `PCollection`
+> contents are logically immutable, not physically immutable. Changes to input
+> elements may be visible to DoFns executing within the same bundle, and may
Review comment:
Good call.
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[GitHub] [beam] robertwb commented on a change in pull request #15227: Clarify PCollection immutability.
Posted by GitBox <gi...@apache.org>.
robertwb commented on a change in pull request #15227:
URL: https://github.com/apache/beam/pull/15227#discussion_r694277635
##########
File path: website/www/site/content/en/documentation/programming-guide.md
##########
@@ -448,6 +448,12 @@ individual elements. A Beam Transform might process each element of a
`PCollection` and generate new pipeline data (as a new `PCollection`), *but it
does not consume or modify the original input collection*.
+> **Note:** Beam SDKs avoid unnecessary copying of elements, so `PCollection`
+> contents are logically immutable, not physically immutable. Changes to input
+> elements may be visible to DoFns executing within the same bundle, and may
Review comment:
may be visible to other DoFns...
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[GitHub] [beam] lostluck commented on pull request #15227: Clarify PCollection immutability.
Posted by GitBox <gi...@apache.org>.
lostluck commented on pull request #15227:
URL: https://github.com/apache/beam/pull/15227#issuecomment-887654519
R: @robertwb
cc: @klk (since we discussed it a few weeks ago, no response expected)
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[GitHub] [beam] lostluck merged pull request #15227: Clarify PCollection immutability.
Posted by GitBox <gi...@apache.org>.
lostluck merged pull request #15227:
URL: https://github.com/apache/beam/pull/15227
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