If you are using the stock version 0.20.2 of Hadoop, you might have run into HDFS-611 (https://issues.apache.org/jira/browse/HDFS-611). If that's the case -- most likely it is -- you can apply the supplied patch for 0.20.2, i.e. HDFS-611.branch-20.v6.patch.
Best, Michael On Tue, Feb 1, 2011 at 19:38, Da Zheng <zhengda1...@gmail.com> wrote: > Hello, > > I want to measure the performance of HDFS on a cluster. There are 16 nodes > in the cluster and each node has 12GB memory. In order to reduce the impact > of caching of the file system, each file written by TestDFSIO is 10GB. The > replication factor is 1. Then I got the errors such as > org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException and > org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException. Could anyone > tell me what the errors mean? >
