[jira] [Created] (HDFS-16386) Reduce DataNode load when FsDatasetAsyncDiskService is working

["JiangHua Zhu (Jira)" <ji...@apache.org>]

JiangHua Zhu created HDFS-16386:
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             Summary: Reduce DataNode load when FsDatasetAsyncDiskService is working
                 Key: HDFS-16386
                 URL: https://issues.apache.org/jira/browse/HDFS-16386
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
    Affects Versions: 2.9.2
            Reporter: JiangHua Zhu


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.



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