[HDFS-13783] Balancer: make balancer to be a long service process for easy to monitor it.

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.3.0
• Component/s: balancer & mover
• Release Note: Adds a new parameter to the Balancer CLI, "-asService", to enable the process to be long-running.
• Assignee: Chen Zhang
• Reporter: Baolong Mao
• Created: 02/Aug/18 01:39
• Updated: 31/Jul/19 03:29
• Resolved: 30/Jul/19 22:46

Description

If we have a long service process of balancer, like namenode, datanode, we can get metrics of balancer, the metrics can tell us the status of balancer, the amount of block it has moved,
We can get or set the balance plan by the balancer webUI. So many things we can do if we have a long balancer service process.

So, shall we start to plan the new Balancer? Hope this feature can enter the next release of hadoop.

Issue Links

• is related to: HDFS-7204 balancer doesn't run as a daemon
• is related to: HDFS-10648 Expose Balancer metrics through Metrics2
• is related to: HDFS-14662 Document the usage of the new Balancer "asService" parameter