[KYLIN-1139] Hive job not starting due to error "conflicting lock present for default mode EXCLUSIVE "

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: v1.0, v1.1
• Fix Version/s: v1.2, v1.4.0
• Assignee: Shao Feng Shi
• Reporter: Shao Feng Shi
• Created: 12/Nov/15 08:10
• Updated: 22/Dec/15 09:20
• Resolved: 24/Nov/15 03:37

Description

some kylin hive jobs are not starting due to "conflicting lock present for default mode EXCLUSIVE ", the log in the first cube build step is similar to :

conflicting lock present for default mode EXCLUSIVE 
conflicting lock present for default mode EXCLUSIVE 
conflicting lock present for default mode EXCLUSIVE 
conflicting lock present for default mode EXCLUSIVE 
FAILED: Error in acquiring locks: Locks on the underlying objects cannot be acquired. retry after some time 

This is related with Hive's concurrency model:
https://cwiki.apache.org/confluence/display/Hive/Locking

If the underlying table is locked by other users, Kylin will not be able to read from it. Hadoop admin suggest to set "hive.support.concurrency" as false and rerun the job.