Resolving an exceeded max jobconf size error in Hive

Symptom

You receive the following error message:

select count(*) from rq_feature_detail A join vclaim_tab B where A.
country=B.country and A.year=B.year;
Total MapReduce jobs = 2
Launching Job 1 out of 2
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
set mapred.reduce.tasks=<number>
org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.io.
IOException: Exceeded max jobconf size: 7374812 limit: 5242880
at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:3944)
at org.apache.hadoop.mapred.EnhancedJobTracker.submitJob
(EnhancedJobTracker.java:150)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:578)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
at java.security.AccessController.doPrivileged(AccessController.java:
310)
at javax.security.auth.Subject.doAs(Subject.java:573)
at org.apache.hadoop.security.UserGroupInformation.doAs
(UserGroupInformation.java:1144)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)
Caused by: java.io.IOException: Exceeded max jobconf size: 7374812
limit: 5242880
at org.apache.hadoop.mapred.JobInProgress.<init>(JobInProgress.java:
408)
at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:3942)
... 12 more