Francesco Mari created OAK-3107:
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Summary: SegmentWriter should be able to store blob IDs longer
than 4096 bytes
Key: OAK-3107
URL: https://issues.apache.org/jira/browse/OAK-3107
Project: Jackrabbit Oak
Issue Type: Improvement
Reporter: Francesco Mari
The {{SegmentWriter}} is able to store blob IDs that are no longer than 4096
bytes, but some implementation of {{BlobStore}} may return blob IDs 4096 bytes
long (or more).
It should be possible to use a different encoding for long blob IDs. The blob
IDs should be written as a string (using {{SegmentWriter#writeString}}), and
its reference ID embedded into a value record.
The encoding in this case should be something like the following:
{noformat}
11110 + 3bit + 3byte
{noformat}
where the three least significant bits of the first bytes are actually unused,
and the three bytes are used to store the record ID of the string representing
the blob ID.
This new encoding is necessary to maintain backwards compatibility with the
current way of storing blob IDs and to give a way to {{SegmentBlob}} to
recognise this new encoding.
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