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From Aleksandar Ivanisevic <aleksan...@ivanisevic.de>
Subject KahaDB latch wait warnings
Date Wed, 08 Dec 2010 13:54:20 GMT


Just switched to kahadb on my amq 5.4.1 (fuse) and the log is filling
with this:


2010-12-08 14:26:12,668 | WARN  | KahaDB PageFile flush: 3 queued writes, latch wait took
119 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
2010-12-08 14:28:03,769 | WARN  | KahaDB PageFile flush: 7 queued writes, latch wait took
140 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
2010-12-08 14:28:39,125 | WARN  | KahaDB PageFile flush: 3 queued writes, latch wait took
112 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
2010-12-08 14:30:04,928 | WARN  | KahaDB PageFile flush: 8 queued writes, latch wait took
109 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
2010-12-08 14:30:28,788 | WARN  | KahaDB PageFile flush: 8 queued writes, latch wait took
18839 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker

quick code search turns out that this warning is fixed to 100ms

http://bit.ly/gYH1Zu

why 100ms and why is this important?



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