[GOBBLIN-637] Create dag checkpoint dir on initialization to avoid NPE

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.14.0
• Fix Version/s: 0.14.0
• Component/s: gobblin-service
• Assignee: Sudarshan Vasudevan
• Reporter: Sudarshan Vasudevan
• Created: 26/Nov/18 04:08
• Updated: 26/Nov/18 17:55
• Resolved: 26/Nov/18 17:55

Description

FSDagStateStore#getDags() throws a NPE if the dag checkpoint directory does not exist, since File#listFiles() returns null when the directory does not exist. The fix eagerly creates the checkpoint directory on instantiation of FSDagStateStore.