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HDFS federation configuration

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We tried setting up HDFS name node federation set up with 2 name nodes. I am facing few issues.

Can any one help me in understanding below points?
1) how can we configure different namespaces to different name node? Where exactly we need to configure this?
2) After formatting each NN with one cluster id, Do we need to set this cluster id in hdfs-site.xml?
3) I am getting exception like, data dir already locked by one of the NN, But when dont specify data.dir, then its not showing exception.

So what could be the issue?

posted Jan 23, 2014 by Bob Wise

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Thanks. I followed the link its clear now. But client side configuration is not covered on the doc.

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