Am trying to upgrade my cluster from CDH4.6 to CDH5 .
Cloudera Manager Server,Agent were upgraded successfully.
CDH5 components were installed manually on each nodes in the cluster.
When bringing the Namenode up , i got the below mentioned error. Please help.
java.io.IOException: File system image contains an old layout version -40. An upgrade to version -55 is required. Please restart NameNode with the "-rollingUpgrade started" option if a rolling upgraded is already started; or restart NameNode with the "UPGRADE" to start a new upgrade.