[HDFS-16386] Reduce DataNode load when FsDatasetAsyncDiskService is working

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9.2
• Fix Version/s: 3.4.0, 3.2.3, 3.3.2, 3.2.4
• Component/s: datanode
• Labels: pull-request-available
• Assignee: JiangHua Zhu
• Reporter: JiangHua Zhu
• Created: 16/Dec/21 09:03
• Updated: 25/May/22 05:00
• Resolved: 20/Dec/21 12:12

Description

Our DataNode node has 36 disks. When FsDatasetAsyncDiskService is working, it will cause a high load on the DataNode.
Here are some monitoring related to memory:

Since each disk deletes the block asynchronously, and each thread allows 4 threads to work,
This will cause some troubles to the DataNode, such as increased cpu and increased memory.
We should appropriately reduce the number of jobs of the total thread so that the DataNode can work better.

Issue Links

• links to: GitHub Pull Request #3806