On Mon, Jul 9, 2012 at 8:35 PM, Asaf Mesika <asaf.mes...@gmail.com> wrote: > Hi, > > My cluster started being incredibly slow in the past 2 days. > I've seen many Blocking updates on the region server logs, which lead me to > believe HDFS creates is the bottleneck. > I ran a small test (hadoop fs -copyFromLocal big3_3Giga.tz.gz /tmp) which > copies a 3.3G file, and I was surprised to see a rate of 11MB/sec, when it > was previously around 28MB/sec. > > I have 3 RS computers, hosting DataNode and embedded zookeeper as well. > And 1 Master computer, hosting NameNode as well. > > The slowest computer has Core 2 Duo 2.93GHz, 4GB. > > What steps can I take to find out the source of this slowdown?
Install ganglia or opentsdb and figure what your cluster is up to when its slow. St.Ack
