[SLIDER-174] HBase Master needs data locality

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Slider 0.40
• Assignee: Ted Yu
• Reporter: Ted Yu
• Created: 26/Jun/14 02:18
• Updated: 10/Jul/14 19:52
• Resolved: 26/Jun/14 16:52

Description

Currently:

    // Master doesn't need data locality
    ROLES.add(new ProviderRole(HBaseKeys.ROLE_MASTER, KEY_MASTER,PlacementPolicy.NO_DATA_LOCALITY));

But in RoleHistory#findNodeForNewInstance():

    if (role.getNoDataLocality()) {
      return null;
    }

This implies that HBase master instances might be scheduled on one host, obviating the goal for HA.