Hi!   Our cluster has been upgraded from CDH 4.6 to 5.1.3. Upgrade process was seamless, but since this moment Hue can't connect to mapreduce1 JobTracker. That right: [root@host03 ~]# netstat -nlpt | grep 9290 [root@host03 ~]#   Because service doesn't run: [root@host03 ~]# tail -f /var/log/hadoop-0.20-mapreduce/hadoop-cmf-mapreduce1-JOBTRACKER.log.out | grep -i plug 2014-11-05 00:12:57,880 WARN org.apache.hadoop.util.PluginDispatcher: Unable to load mapred.jobtracker.plugins plugins     My Cloudera Manager settings: mapred.jobtracker.plugins="" Enable JobTracker Plugins Required for Hue="On" jobtracker.thrift.address="9290"   As I understand this is identical to reference values: <property>   <name>jobtracker.thrift.address</name>   <value>0.0.0.0:9290</value> </property> <property>   <name>mapred.jobtracker.plugins</name>   <value>org.apache.hadoop.thriftfs.ThriftJobTrackerPlugin</value> </property>     I've put hue-plugins.jar files anywhere: [root@host03 cmf]# find / -name hue-plugins-*.jar /usr/lib/hadoop-0.20-mapreduce/lib/hue-plugins-3.6.0-cdh5.1.3.jar /usr/lib/hadoop/lib/hue-plugins-3.6.0-cdh5.1.3.jar /usr/share/cmf/lib/hue-plugins-2.1.0-cdh4.1.0.jar /usr/share/cmf/lib/hue-plugins-3.6.0-cdh5.1.3.jar /usr/share/cmf/cloudera-navigator-audit-server/hue-plugins-2.1.0-cdh4.1.0.jar /usr/share/cmf/cloudera-navigator-audit-server/hue-plugins-3.6.0-cdh5.1.3.jar /opt/cloudera/parcels/CDH-5.1.3-1.cdh5.1.3.p0.12/lib/hadoop/lib/hue-plugins-3.6.0-cdh5.1.3.jar /opt/cloudera/parcels/CDH-5.1.3-1.cdh5.1.3.p0.12/lib/hue/desktop/libs/hadoop/java-lib/hue-plugins-3.6.0-cdh5.1.3.jar   ... and duplicated it with SNAPSHOT word in filename: /usr/lib/hadoop-0.20-mapreduce/lib/hue-plugins-3.6.0-cdh5.1.3-SNAPSHOT.jar /usr/lib/hadoop/lib/hue-plugins-3.6.0-cdh5.1.3-SNAPSHOT.jar     I've set 755 permissions for all this files (was 644 after upgrade).   No any effect. 😞   What else can I check? ... View more