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转：虚拟化管理软件比较

虚拟化管理软件比较 最近笼统地学习和试用了几款比较有名的虚拟化管理软件。学习的内容包括Eucalyptus, OpenNebula, OpenStack, OpenQRM, XenServer, Oracle VM, CloudS ...
cloud虚拟机 
mzli 评论(0) 有1126人浏览 2011-07-05 00:23

impact of total region numbers?

这几天tune了hbase的几个参数，有些有意思的结果。具体看我下面的邮件吧。   For example, I have total some data and I can tune hbase.hregion.max.filesize to increase/decrease total region number, rite? I want t ...
hadoophbasecloud 
standalone 评论(0) 有934人浏览 2011-01-19 16:31

细说HBase怎么完成一个Get操作 (server side)

上面有一篇记录了client边的过程，现在看看RegionSever这边怎么进行下去。 经过HBaseRPC后，调用传递到HRegionServer.get(byte[] regionName, Get get).     HRegion region = getRegion(regionName); return region.get(get, getLockFromId(get.get ...
HBasecloud 
standalone 评论(0) 有4348人浏览 2011-01-14 16:33

Hbase read performance with increasing number of client threads

  在跑ycsb的时候，发现在做heavy的get操作的时候，ycsb统计的latency很大，100个thread的时候就接近100ms，而从ganglia上看hbase的“get_avg_time"这个metric发现只有20~30左右。最终查看code，发现100个thread共享同一个连接，所有Call的请求数据都走这一个连接，所以在大量请求并发时会造成拥堵，latency变大。 ...
hbaseperformancecloud 
standalone 评论(0) 有1629人浏览 2010-10-12 23:19

What are some tips for configuring HBase?

  
hbasecloud 
standalone 评论(0) 有1427人浏览 2010-10-11 15:42

当hbase的master无法停掉的时候……

some times you will find the master in a hbase cluster cannot be stopped, so check the following two items suggested by some guy in hbase user mail list. But I'm not sure it helps.   > If zookeep ...
hbasecloud 
standalone 评论(0) 有1459人浏览 2010-09-28 11:19

HDFS

Run hadoop fsck / will give you summary of current HDFS status including some useful information :  Minimally replicated blocks:   51224 (100.0 %)  Over-replicated blocks:        0 (0.0 %)  Under-repli ...
HadoopHDFSCloud 
standalone 评论(0) 有1085人浏览 2010-01-27 09:26

DataCenter使用SSD Drive的好处

http://arstechnica.com/business/news/2009/10/latest-migrations-show-ssd-is-ready-for-some-datacenters.ars   1. save floor space. 2. cost saving in the long run: take power and cooling cost into coun ...
cloudSSDdata center 
standalone 评论(0) 有1178人浏览 2009-10-29 14:27

EMC's Cloud Storage System

EMC this week took the wraps off its long-awaited cloud storage infrastructure solution, moving the vendor long known for proprietary hardware offerings into the market for commodity hardware. E ...
cloudatmos 
standalone 评论(0) 有1026人浏览 2009-07-29 13:24

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