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From norbi <no...@rocknob.de>
Subject Hadoop HDFS slow after upgrade vom 0.20 -> to 2.0
Date Tue, 19 Aug 2014 08:09:11 GMT
Hi List,

we have upgraded Hadoop from our very old version 0.20 to Cloudera 4.7 
(hadoop 2.0), we are only using HDFS.
After upgrade (no configuration changes), the hdfs seems to bee very 
slow. It needs more than 2h to copying 40GB(47 files) out of the hdfs, 
bevor upgrading it was about 1h.

We are using 52 Datanodes with 10 discs, all connectet via 1gig.

How can we speed up hdfs, or where can be the bottleneck?


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