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https://issues.apache.org/jira/browse/OAK-7091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Ryan reassigned OAK-7091:
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Assignee: (was: Matt Ryan)
> Avoid streaming data twice in composite data store
> --------------------------------------------------
>
> Key: OAK-7091
> URL: https://issues.apache.org/jira/browse/OAK-7091
> Project: Jackrabbit Oak
> Issue Type: Technical task
> Components: blob, blob-cloud, blob-cloud-azure, blob-plugins
> Reporter: Matt Ryan
>
> When adding a new record to an Oak instance that is using composite data
> store, the blob stream will be read twice before it is stored - once by the
> composite data store (to determine the blob ID) and again by the delegate.
> This necessary because if there are multiple writable delegates and one
> delegate already has a matching blob, the composite should call
> {{addRecord()}} on the delegate that has the matching blob, which may not be
> the highest priority delegate. So we need to know the blob ID in order to
> select the correct writable delegate.
> We could add a method to the CompositeDataStoreAware interface wherein the
> data store can be told which blob ID to use (from the composite) so that it
> doesn't have to process the stream again. Then the composite data store,
> after having read the stream to a temporary file, can pass an input stream
> from the temporary file to the delegate along with the computed blob ID, to
> avoid reading the stream twice.
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