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Hadoop >> mail # user >> HDFS Client write data is slow

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HDFS Client write data is slow
I use Hbase-0.94 and hadoop-2.0.

I install one HDFS cluster that have 15 datanodes. If network bandwidth of
two datanodes is saturation(example 100m/s),  writing performance of the entire
hdfs cluster is slow.

I think that the slow datanodes affect the writing performance of the entire

How does HDFS Client avoid writing data to the slow datanodes?