Hadoop lesson learnt: Restart datanodes after modifying dfs.balance.bandwidthPerSec

Published: 2010-09-10 13:17 UTC. Tags: hadoop

I was rebalancing one of the Hadoop clusters I run at work. It was not running very fast, so I modified the appropriate setting:

<property>
  <!-- 100Mbit/s -->
  <name>dfs.balance.bandwidthPerSec</name>
  <value>104857600</value>
</property>

I restarted the namenode and thought that would make the trick. But no, you also need to restart all your datanodes for the setting to take effect. Now I can see some action on my network graphs :-).

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