question Re: Hue's plugins for MRv1 won't start after upgrade CDH4->CDH5 in Archives of Support Questions (Read Only)

Hue's plugins for MRv1 won't start after upgrade CDH4->CDH5

Zylog — Tue, 21 Apr 2026 14:00:02 GMT

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?

Re: Hue's plugins for MRv1 won't start after upgrade CDH4->CDH5

karthik14 — Wed, 05 Nov 2014 10:49:05 GMT

Hi,

Remove old version of hue plugins and restart the MR. It should load.

Re: Hue's plugins for MRv1 won't start after upgrade CDH4->CDH5

Zylog — Wed, 05 Nov 2014 11:52:26 GMT

Hi!

I've removed all hue-plugins-2.1.0-cdh4.1.0.jar files from all cluster's hosts and restarted mapreduce1 services. Same result:

PluginDispatcher: Unable to load mapred.jobtracker.plugins plugins

Then I've tried to put hue-plugins-3.6.0-cdh5.1.3.jar instead old files to same folders:

/usr/share/cmf/lib/

/usr/share/cmf/cloudera-navigator-audit-server/

Anyway - It does not load.

Unfortunately there no MRv1 service in cloudera-quickstart-vm-5.0.0-0 image. I would be happy to compare our cluster with reference setup. 😞

Re: Hue's plugins for MRv1 won't start after upgrade CDH4->CDH5

Juga — Thu, 13 Nov 2014 22:55:52 GMT

Is JobTracker perhaps running with JDK 1.6? If so, that would explain why hue plugins wouldn't load, they are compiled for JDK 1.7 only.

Re: Hue's plugins for MRv1 won't start after upgrade CDH4->CDH5

Zylog — Fri, 14 Nov 2014 06:24:42 GMT

Yes. JDK 1.6.

Thank you for the advice!