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https://issues.apache.org/jira/browse/HDFS-16043?focusedWorklogId=614813&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-614813
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ASF GitHub Bot logged work on HDFS-16043:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 25/Jun/21 01:46
Start Date: 25/Jun/21 01:46
Worklog Time Spent: 10m
Work Description: jojochuang commented on a change in pull request #3063:
URL: https://github.com/apache/hadoop/pull/3063#discussion_r658412280
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
##########
@@ -4909,6 +4930,73 @@ public long getLastRedundancyMonitorTS() {
return lastRedundancyCycleTS.get();
}
+ /**
+ * Periodically deletes the marked block.
+ */
+ private class MarkedDeleteBlockScrubber implements Runnable {
+ private Iterator<BlockInfo> toDeleteIterator = null;
+ private boolean isSleep;
+
+ private void toRemove(long time) {
Review comment:
the method name does not convey its work. a toX() method usually implies
it converts the object to another type of object.
let's rename it as "remove"?
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Issue Time Tracking
-------------------
Worklog Id: (was: 614813)
Time Spent: 2.5h (was: 2h 20m)
> 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
> Assignee: Xiangyi Zhu
> Priority: Major
> Labels: pull-request-available
> Attachments: 20210527-after.svg, 20210527-before.svg
>
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> 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.
> h3. Comparison before and after optimization:
> Delete 1000w Inode and 1000w block test.
> *before:*
> 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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