[jira] [Created] (OAK-3107) SegmentWriter should be able to store blob IDs longer than 4096 bytes

["Francesco Mari (JIRA)" <ji...@apache.org>]

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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