Major Description
DataStoreBlobStore#getAllChunkIds loads the DataRecord for checking that the lastModifiedTime criteria is satisfied against the given maxLastModifiedTime.
When the maxLastModifiedTime has a value 0 it effectively means ignore any last modified time check (and which is the only usage currently from MarkSweepGarbageCollector). This should ignore fetching the DataRecords as this can be very expensive for e.g on calls to S3 with millions of blobs.
