Xiangyi Zhu created HDFS-16043:
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Summary: HDFS : Delete performance optimization
Key: HDFS-16043
URL: https://issues.apache.org/jira/browse/HDFS-16043
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs, namanode
Affects Versions: 3.4.0
Reporter: Xiangyi Zhu
The deletion of the large directory caused NN to hold the lock for too long,
which caused our NameNode to be killed by ZKFC.
Through the flame graph, it is found that its main time-consuming calculation
is QuotaCount when removingBlocks(toRemovedBlocks) and deleting inodes, and
removeBlocks(toRemovedBlocks) takes a higher proportion of time.
h3.
solution:
1. RemoveBlocks is processed asynchronously. A thread is started in the
BlockManager to process the deleted blocks and control the lock time.
2. QuotaCount calculation optimization, this is similar to the optimization of
this Issue [HDFS-16000|https://issues.apache.org/jira/browse/HDFS-16000].
h3. Comparison before and after optimization:
Delete 1000w Inode and 1000w block test.
*before:*
Before optimization: remove inode elapsed time: 7691 ms
remove block elapsed time :11107 ms
*after:*
remove inode elapsed time: 4149 ms
remove block elapsed time :0 ms
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