[ACCUMULO-140] Prevent linux from caching write ahead log files

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: logger
• Assignee: Eric C. Newton
• Reporter: Keith Turner
• Created: 12/Nov/11 00:23
• Updated: 18/Dec/12 19:39
• Resolved: 18/Dec/12 19:39

Description

While at ApacheCon I attended a talk about Cassandra. The developer mentioned using posix_fadvise to prevent linux from storing edit/write ahead log data in the page cache. This sounds great. Accumulo can do this for its write ahead logs.

Using posix_fadvise was also mentioned for compactions, this is something Accumulo can not do because its compactions read and write to hdfs.