Hi,     Can you please check the Node Managers logs. If the logs show the follwoing message: DiskSpace reached the threshold value.   This is due to disk space of you cluster. Node managers are running fine, but they already reached the threshold value for this following parameter. yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage = 90.0 % (default) and usage is beyond the 90%  per disk.   This makes Node Managers are unhealthy status. If Node Managers are in unhealthy status Resource Manager won't allocate resources to run your applications. You can increase the value to bigger like 95%.   The best solution is: add a few more disks having enough space to both HDFS data nodes and Yarn Node Managers. ... View more

Hi All,   This is an issue with fully qualified name of the Class.   In the older versions, class name is:  com.cloudera.flume.source.TwitterSource   In the latest version of the flume TwitterSource is already shipped and no need to download separately.    The class name is changed to org.apache.flume.source.twitter.TwitterSource   Please carefully change the class name, defitely It will work for you   Thanks Naga ... View more