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@ted12138 ted12138 commented Apr 5, 2022

… or synchronous

Description of PR

How was this patch tested?

For code changes:

  • Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
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  • If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
  • If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

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while (iter.hasNext()) {
writeLock();
try {
for (int i = 0; i < blockDeletionIncrement && iter.hasNext(); i++) {
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Removed blockDeletionIncrement in HDFS-16554

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About "blockDeletionIncrement", in my opinion, why we removed it in HDFS-16554 is that we decided to use delete async to replace the previous method, so the "blockDeletionIncrement" won't be used any more. But when we add a switch to control blocks deletion async, we need to save the previous block deletion method, so we still need it.

@@ -481,6 +481,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
"dfs.namenode.block.deletion.increment";
public static final int DFS_NAMENODE_BLOCK_DELETION_INCREMENT_DEFAULT = 1000;

/** Block deletion asynchronous. */
public static final String DFS_NAMENODE_BLOCK_DELETION_ASYNC_KEY = "dfs.namenode.block.deletion.async";
public static final boolean DFS_NAMENODE_BLOCK_DELETION_ASYNC_DEFAULT = false;
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Should it default to true?

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* a list of blocks that need to be removed from blocksMap
*/
void removeBlocks(List<BlockInfo> toDeleteList) {
if (this.blockDeletionAsync) {
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The variable blockDeletionAsync doesn't seem to be declared.

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@@ -3403,6 +3407,33 @@ FSPermissionChecker getPermissionChecker()
return dir.getPermissionChecker();
}

/**
* If blockDeletionAsync enables, blocks will be deleted asynchronously.

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use dfs.namenode.block.deletion.async not blockDeletionAsync

writeLock();
try {
for (int i = 0; i < blockDeletionIncrement && iter.hasNext(); i++) {
blockManager.removeBlock(iter.next());

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Compared with the previous one, the following code is missing:

toRemoveBlocks.clear(); 

https://github.com/apache/hadoop/pull/3063/files#diff-dac9de4dd225110eff2f29a44000bf32705f02df2b3fcf17b5d89bc236c12f01

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