OAK-301 : oak docu

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1596523 13f79535-47bb-0310-9956-ffa450edef68
OAK-1817: NPE in MarkSweepGarbageCollector.saveBatchToFile during Datastore GC with FileDataStore

Use correct segment size when wrapping the buffer

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1596534 13f79535-47bb-0310-9956-ffa450edef68