[BOOKKEEPER-963] Allow to use multiple journals in bookie

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Fix Version/s: 4.5.0
• Assignee: Matteo Merli
• Reporter: Matteo Merli
• Created: 02/Nov/16 20:52
• Updated: 23/Mar/17 17:30
• Resolved: 22/Mar/17 21:59

Description

By configuring multiple journals, we can take advantage of the IO of multiple
disks to increase the write throughput of a single bookie.

Each journal will have its own journal and sync threads and writes will be
assigned to a particular journal by hashing on the ledger id.

In addition to using multiple physical disks, there can improvements even by
using multiple journal on a single SSD device, because these disks can handle
well multiple concurrent writes in different blocks of the disk.

Issue Links

• duplicates: BOOKKEEPER-1009 Allow the use of multiple journals in bookie
• is cloned by: BOOKKEEPER-1009 Allow the use of multiple journals in bookie
• links to: GitHub Pull Request #71