brion added a comment.
re this:
$bs->deleteBlob( $dataUrl ); // dk: this goes wrong if the URL is
content/hash based!
I think the return from this:
$dataUrl = $bs->saveBlob( $content->serialize() );
needs to signal whether a blob was created or whether an existing blob was
reused. This means the blob store itself needs a transactional concept at least
within the boundaries of 'does this blob exist?' followed by 'store this blob'.
If two processes conflict (adding the same content at around the same time),
then the second one needs to be able to detect the conflict and return the
'reference to existing' signal instead of the 'inserted new' signal.
TASK DETAIL
https://phabricator.wikimedia.org/T107595
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