I found that on one of the datanode /var/lib/cloudera-scm-agent directory has been deleted by mistake.
It has two files -uuid and response.avro.
uuid i have recreated by adding string as per cloudera-server logs.But response.avro got auto re-created in very small size.
But still that node unable to communicate with Master.
I tested avro file gets recreted with same chksum and should be good.
As per log :
2015-09-25 08:45:51,608 ERROR ParcelUpdateService:com.cloudera.parcel.components.ParcelDownloaderImpl: (5 skipped) Unable to retrieve remote parcel repository manifest
java.util.concurrent.ExecutionException: java.net.ConnectException: http://archive.cloudera.com/navigator-keytrustee5/parcels/latest/manifest.json
Probably something wrong happened to parcel downloaded on this node .(NOde was good for last 2-3 months)