HBASE-28836 Parallelize the file archival to improve the split times #6243

mnpoonia · 2024-09-13T07:40:03Z

No description provided.

… object store (s3)

mnpoonia · 2024-09-13T07:40:24Z

@apurtell FYI

Umeshkumar9414

LGTM

Umeshkumar9414 · 2024-09-13T08:10:23Z

hbase-server/src/main/java/org/apache/hadoop/hbase/backup/HFileArchiver.java

@@ -439,7 +439,7 @@ private static List<File> resolveAndArchive(FileSystem fs, Path baseArchiveDir,

    List<File> failures = new ArrayList<>();
    String startTime = Long.toString(start);
-    for (File file : toArchive) {
+    toArchive.parallelStream().forEach(file -> {


Good to check the difference between the parallelStream() and stream().parallel(). Java doc say that for parallelStream "It is allowable for this method to return a sequential stream."

Umeshkumar9414 · 2024-09-13T08:11:54Z

hbase-server/src/main/java/org/apache/hadoop/hbase/backup/HFileArchiver.java

@@ -439,7 +439,7 @@ private static List<File> resolveAndArchive(FileSystem fs, Path baseArchiveDir,

    List<File> failures = new ArrayList<>();
    String startTime = Long.toString(start);
-    for (File file : toArchive) {
+    toArchive.parallelStream().forEach(file -> {


Also if toArchive is small, there are chances that making it parallel can take more time than doing the same sequentially.

This wouldn't be the case as it is an IO operation (and diff wouldn't be noticable). So parallelizing it would improve it over what we already have. In pricinple i agree about what you are saying

I thought parallelStream (and its underlying ForkJoinPool) is not really for I/O blocking operations.

Yes, that's another point to consider

Apache-HBase · 2024-09-13T08:26:45Z

🎊 +1 overall

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Apache-HBase · 2024-09-13T11:43:20Z

💔 -1 overall

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mnpoonia · 2024-09-13T16:01:07Z

Unit test failures seems to be unrelated.


ERROR] Failures: 
[ERROR]   TestSecureIPC>AbstractTestSecureIPC.testRpcServerDisallowFallbackToSimpleAuth:279 
Expected: (an instance of java.io.EOFException or an instance of org.apache.hadoop.hbase.exceptions.ConnectionClosedException)
     but: was <java.net.SocketException: Connection reset>
[ERROR] Errors: 
[ERROR]   TestSecureIPC.setUp:74->AbstractTestSecureIPC.initKDCAndConf:99 Â» Krb Failed to load or create keytab /home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-6243/yetus-jdk17-hadoop3-check/src/hbase-server/target/test-data/2cbc9b35-01c7-7660-1fc6-e1d4722aafe2/keytab
[INFO] 
[ERROR] Tests run: 7004, Failures: 1, Errors: 1, Skipped: 35
[INFO]

virajjasani

While it is good to have parallel stream, it still relies on CPU cores to distribute the task for the underlying fork-join pool right? Why not create our own thread-pool to execute the tasks to achieve deterministic behavior independent of CPU cores?

d-c-manning · 2024-09-13T21:52:30Z

hbase-server/src/main/java/org/apache/hadoop/hbase/backup/HFileArchiver.java

@@ -439,7 +439,7 @@ private static List<File> resolveAndArchive(FileSystem fs, Path baseArchiveDir,

    List<File> failures = new ArrayList<>();
    String startTime = Long.toString(start);
-    for (File file : toArchive) {
+    toArchive.parallelStream().forEach(file -> {


I thought parallelStream (and its underlying ForkJoinPool) is not really for I/O blocking operations.

d-c-manning · 2024-09-13T21:53:09Z

hbase-server/src/main/java/org/apache/hadoop/hbase/backup/HFileArchiver.java

@@ -439,7 +439,7 @@ private static List<File> resolveAndArchive(FileSystem fs, Path baseArchiveDir,

    List<File> failures = new ArrayList<>();
    String startTime = Long.toString(start);
-    for (File file : toArchive) {
+    toArchive.parallelStream().forEach(file -> {


is the access to ArrayList failures thread safe?

d-c-manning

is HFileArchiver in the path for Split? It should be background.

virajjasani · 2024-09-14T23:52:27Z

Since both region close as well as CompactedHFilesDischarger chore performs archival, we can keep Jira/PR title generic i.e. "Parallelize the file archival for performance improvement" or "Parallelize the file archival" (by removing both "split times" and "object stores" from it because the change is generic and not specific to object stores as per the PR change, and Jira description is good to explain why we need this specifically for S3).

…times in object store (s3)" This reverts commit be6e570.

Apache9 · 2024-09-16T14:15:34Z

hbase-server/src/main/java/org/apache/hadoop/hbase/backup/HFileArchiver.java

@@ -439,7 +439,7 @@ private static List<File> resolveAndArchive(FileSystem fs, Path baseArchiveDir,

    List<File> failures = new ArrayList<>();
    String startTime = Long.toString(start);
-    for (File file : toArchive) {
+    toArchive.parallelStream().forEach(file -> {


There are IO operations in the code block so usually it is not safe to use parallelStream...

AFAIK parallelStream will make use of a common thread pool(ForkJoinPool.commonPool IIRC) which could be used by lots of other operations in java, so it is easy to introduce strange dead locks.

If we want to do it in parallel, we'd better introduce our own thread pool.

Apache-HBase · 2024-09-17T06:00:10Z

💔 -1 overall

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Apache-HBase · 2024-09-17T09:17:38Z

🎊 +1 overall

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NihalJain · 2024-09-17T09:31:54Z

nit: Parallize -> Parallelize

mnpoonia · 2024-09-17T10:14:08Z

I have added the logic for executor service doing the cleanup. I am still looking at executor service creation and config part. Basically trying to figure out the right config. Currently i am thinking of using hbase.regionserver.region.split.threads.max config for number of executor threads.
@d-c-manning @virajjasani @Apache9 FYI

Apache-HBase · 2024-09-17T11:11:20Z

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Apache-HBase · 2024-09-17T14:29:44Z

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mnpoonia · 2024-11-20T10:00:20Z

Created a new PR because of messed up local git.
#6483

HBASE-28836 Parallize the file archival to improve the split times in…

be6e570

… object store (s3)

Umeshkumar9414 approved these changes Sep 13, 2024

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mnpoonia changed the title ~~HBASE-28836 Parallize the file archival to improve the split times in…~~ HBASE-28836 Parallize the file archival to improve the split times Sep 16, 2024

Revert "HBASE-28836 Parallize the file archival to improve the split …

2f405e9

…times in object store (s3)" This reverts commit be6e570.

Apache9 reviewed Sep 16, 2024

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Use executor service for cleanup of files

b33878a

mnpoonia changed the title ~~HBASE-28836 Parallize the file archival to improve the split times~~ HBASE-28836 Parallelize the file archival to improve the split times Sep 17, 2024

Use synchronized collection

1e21b43

mnpoonia closed this Nov 20, 2024

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HBASE-28836 Parallelize the file archival to improve the split times #6243

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