[HDFS-13811] RBF: Race condition between router admin quota update and periodic quota update service

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.3.0
• Hadoop Flags: Reviewed
• Assignee: Jinglun
• Reporter: Dibyendu Karmakar
• Created: 09/Aug/18 12:29
• Updated: 04/Dec/19 13:16
• Resolved: 04/Dec/19 10:21

Description

If we try to update quota of an existing mount entry and at the same time periodic quota update service is running on the same mount entry, it is leading the mount table to inconsistent state.

Here transactions are:

A - Quota update service is fetching mount table entries.

B - Quota update service is updating the mount table with current usage.

A' - User is trying to update quota using admin cmd.

and the transaction sequence is [ A A' B ]

quota update service is updating the mount table with old quota value.

Issue Links

• relates to: HDFS-13553 RBF: Support global quota