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https://issues.apache.org/jira/browse/OAK-1188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822562#comment-13822562
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Marcel Reutegger commented on OAK-1188:
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{{BlobStoreInputStream}} does not implement buffered reads. Thus, every read
call goes to the underlying {{BlobStore}}. The {{BlobStoreInputStream}} is not
able to tell how many bytes it can provide next without blocking.
IMO returning zero is correct. If a client relies on some specific behavior of
{{InputStream.available()}}, then it would also wrap the returned stream with a
{{BufferedInputStream}}.
> Input streams returned from Blob instances should implement available()
> -----------------------------------------------------------------------
>
> Key: OAK-1188
> URL: https://issues.apache.org/jira/browse/OAK-1188
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: mk, mongomk, segmentmk
> Reporter: Michael Dürig
> Fix For: 0.12
>
>
> Currently {{blob.getNewStream().available()}} returns 0 for all Microkernels
> (i.e for {{MicroKernelInputStream}}, {{SegmentStream}},
> {{BlobStoreInputStream}}). The method should instead return the number of
> bytes available from that stream.
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