[HIVE-7204] Use NULL vertex location hint for Prewarm DAG vertices

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.14.0
• Fix Version/s: 0.14.0
• Component/s: Tez
• Release Note: Use NULL VertexLocationHint for prewarm DAG vertexes.
• Assignee: Gopal Vijayaraghavan Assign to me
• Reporter: Gopal Vijayaraghavan
• Created: 10/Jun/14 03:17
• Updated: 13/Nov/14 19:40
• Resolved: 15/Jun/14 02:28

Description

The current 0.5.x branch of Tez added extra preconditions which check for parallelism settings to match between the number of containers and the vertex location hints.

Caused by: org.apache.hadoop.ipc.RemoteException(java.lang.IllegalArgumentException): Locations array length must match the parallelism set for the vertex
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
        at org.apache.tez.dag.api.Vertex.setTaskLocationsHint(Vertex.java:105)
        at org.apache.tez.dag.app.DAGAppMaster.startPreWarmContainers(DAGAppMaster.java:1004)