As said by Devin, in your flume.conf file you must have below incorrectly specified properties. TwitterAgent.sink.HDFS.hdfs.path TwitterAgent.channel.Memchannel.capacity TwitterAgent.sink.HDFS.channel TwitterAgent.sink.HDFS.hdfs.writeFormat TwitterAgent.channel.Memchannel.type TwitterAgent.sink.HDFS.hdfs.rollCount TwitterAgent.channel.Memchannel.transactionalCapacity TwitterAgent.sink.HDFS.hdfs.batchsize TwitterAgent.sink.HDFS.hdfs.rollSize TwitterAgent.sink.HDFS.hdfs.filetype TwitterAgent.sink.HDFS.type In each of above configuration you need to use TwitterAgent.sinks.HDFS.... and TwitterAgent.channels.Memchannel... etc. Since property syntax in wrong , flume is ignoring them and no channel was finally configured for TwitterAgent agent. Hence this agent was marked as incorrect and hence flume is unable to fetch data. ... View more

You may try VBoxManage internalcommands repairhd --format OVA --filename <image> Use the "--dry-run" option to check what the tool would do. Once image repaired again try to import it. ... View more

Highly likely you are hitting mentioned exception due to Ambari DB inconsistency. ... View more

You can check hive.exec.scratchdir set in hive-site.xml to know hive query logs location. ... View more