[Webkit-unassigned] [Bug 208438] New: IndexedDB Regression: excessive storage consumed iPadOS 13.3.1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208438

            Bug ID: 208438
           Summary: IndexedDB Regression: excessive storage consumed
                    iPadOS 13.3.1
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eddie.newitt at hafele.co.uk

Excessive storage is consumed when inserting IndexedDB data. It seems to depend on volume and transaction size.

e.g. saving 500MB worth of simple text data will result in a consumption of 1350MB of storage.

This behaviour can be reproduced easily in Safari;

1) Check storage & note consumption value (Settings>General>iPad Storage>Safari : Documents & Data)
2) Visit https://demo.agektmr.com/storage/ and insert ~500MB worth of IndexedDB data as 1000 x 500.0KB chunks
3) Accept any additional storage request prompts
4) Check storage consumption value again

If this doesn't reproduce the issue, try different chunk sizes (e.g. 10000 x 50KB)

Tested on A1709 iPad Pro iPadOS 13.3.1

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