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https://issues.apache.org/jira/browse/OAK-8552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16910176#comment-16910176
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Amit Jain commented on OAK-8552:
--------------------------------
[~mattvryan]
1. Essentially, I guess what you are saying is that the n/w call should only be
one. I don't know enough about the Azure blob APIs but maybe we can see if we
can substitute the below call so that we don't need the additional download
attributes call later.
{code}
CloudBlockBlob blob = getAzureContainer().getBlockBlobReference(key);
{code}
bq. But all that is really needed in this case is the reference, which can be
obtained from the back end directly using the blob id - no network calls
required.
Yes it still makes a call for existence in the
DataStoreBlobStore#getReference() which can be potentially removed. Not sure if
there are cases when the call receives a blob id but is not available in the
backend. But in such a case that will lead to situation 2, is it not?
bq. Furthermore, the reason we are even trying to get the reference in the
first place is to determine if this blob is stored inline or not. Maybe there
is a better way to determine this.
I don't think there's much we can do here. The storage inline or not is an
internal implementation of the blob store and the code in oak-store-spi would
have to be aware of such details to check the same.
2. Here it seems there's no alternative but to check for existence. Is that
right? Also, the test that you conducted removed the existence check here only
or also in the condition observed in 1.? If its just the the existence check
that is newly added then that is the major cause of the slow down ~ 250 times
(147 s Vs 40000). Not sure how much changing 1 will help according to your test.
> Minimize network calls required when creating a direct download URI
> -------------------------------------------------------------------
>
> Key: OAK-8552
> URL: https://issues.apache.org/jira/browse/OAK-8552
> Project: Jackrabbit Oak
> Issue Type: Sub-task
> Components: blob-cloud, blob-cloud-azure
> Reporter: Matt Ryan
> Priority: Major
>
> We need to isolate and try to optimize network calls required to create a
> direct download URI.
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