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Clear fiber.sibling field when clearing nextEffect #18970

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merged 2 commits into from May 21, 2020

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@trueadm trueadm commented May 21, 2020

In order to help an internal issue with leaking memory from fibers, we should clear the sibling field when we mark a fiber for deletion. We previously did this in #16820 but this caused internal errors because there are subtle use cases with the deprecated findDOMNode when we need the sibling for traversal.

Instead of clearing the sibling field at this point, we could also maybe clear it when we also clear the nextEffect. This should happen at a later time, after the findDOMNode logic has run, allowing the field to properly be cleared and the retained fiber to be GC'd.

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Comparing: 22f7663...eb3dc35

react-native-renderer

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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ReactDOM: size: 0.0%, gzip: -0.0%

Size changes (stable)

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Comparing: 22f7663...eb3dc35

react-dom

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
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ReactDOM: size: 0.0%, gzip: -0.0%

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@trueadm trueadm merged commit 730ae7a into facebook:master May 21, 2020
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@trueadm trueadm deleted the trueadm:clear-sibling-again branch May 21, 2020
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