stack created HBASE-15594: ----------------------------- Summary: [YCSB] Improvements Key: HBASE-15594 URL: https://issues.apache.org/jira/browse/HBASE-15594 Project: HBase Issue Type: Umbrella Reporter: stack
Running YCSB and getting good results is an arcane art. For example, in my testing, a few handlers (100) with as many readers as I had CPUs (48), and upping connections on clients to same as #cpus made for 2-3x the throughput. The above config changes came of lore; which configurations need tweaking is not obvious going by their names, there were no indications from the app on where/why we were blocked or on which metrics are important to consider. Nor was any of this stuff written down in docs. Even still, I am stuck trying to make use of all of the machine. I am unable to overrun a server though 8 client nodes trying to beat up a single node (workloadc, all random-read, with no data returned -p readallfields=false). There is also a strange phenomenon where if I add a few machines, rather than 3x the YCSB throughput when 3 nodes in cluster, each machine instead is doing about 1/3rd. This umbrella issue is to host items that improve our defaults and noting how to get good numbers running YCSB. In particular, I want to be able to saturate a machine. Here are the configs I'm currently working with. I've not done the work to figure client-side if they are optimal (weird is how big a difference client-side changes can make -- need to fix this). On my 48 cpu machine, I can do about 370k random reads a second from data totally cached in bucketcache. If I short-circuit the user gets so they don't do any work but return immediately, I can do 600k ops a second but the CPUs are at 60-70% only. I cannot get them to go above this. Working on it. {code} <property> <name> hbase.ipc.server.read.threadpool.size </name> <value>48</value> </property> <property> <name> hbase.regionserver.handler.count </name> <value>100</value> </property> <property> <name> hbase.client.ipc.pool.size </name> <value>100</value> </property> <property> <name> hbase.htable.threads.max </name> <value>48</value> </property> {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)