[BOOKKEEPER-995] Implement guaranteed writes to specified number of racks

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.5.0
• Component/s: bookkeeper-client
• Labels: ghmigrated iktriage0
• Assignee: Rithin Shetty
• Reporter: Rithin Shetty
• Created: 26/Jan/17 00:26
• Updated: 17/Oct/17 21:33

Description

With rackaware ensemble placement we get guaranteed writes to at least 2 different racks for every write quorum. We want to extend this such that user can ask for writes to at least 3 or more racks per write quorum. This is useful to ensure higher availability when one of the racks is already down: the remaining copies are guaranteed to be on different racks and hence can with stand another rack failure assuming the write quorum is 3.