Cassandra benchmark shows OK throughput but high read latency ( 100ms)?

Hello, I saw some Cassandra benchmark reports mentioning read latency that is less than 50ms or even 30ms. But my benchmark with 0.5 doesn’t seem to support that. Here’s my settings: Nodes: 2 machines. 2x2.5GHZ Xeon Quad Core (thus 8 cores), 8GB RAM ReplicationFactor=2

Re: Cassandra benchmark shows OK throughput but high read latency ( 100ms)?

are you i/o bound? what is your on-disk data set size? what does iostats tell you? http://spyced.blogspot.com/2010/01/linux-performance-basics.html do you have a lot of pending compactions? (tpstats will tell you) have you increased KeysCachedFraction? On Sun, Feb 14, 2010 at 8:18 PM, Weijun

Re: Bootstrap hung

ERROR [MESSAGE-STREAMING-POOL:1] 2010-02-12 19:08:25,500 DebuggableThreadPoolExecutor.java (line 80) Error in ThreadPoolExecutor java.lang.RuntimeException: java.io.IOException: Невозможно выполнить операцию на сокете, т.к. буфер слишком мал или очередь переполнена at