HADOOP-18872: [ABFS] [BugFix] Misreporting Retry Count for Sub-sequential and Parallel Operations #6019

anujmodi2021 · 2023-09-04T04:29:15Z

Jira Ticket: https://issues.apache.org/jira/browse/HADOOP-18872

Description of PR

There was a bug identified where retry count in the client correlation id was wrongly reported for sub-sequential and parallel operations triggered by a single file system call. This was due to reusing same tracing context for all such calls.
We create a new tracing context as soon as HDFS call comes. We keep on passing that same TC for all the client calls.

For instance, when we get a createFile call, we first call metadata operations. If those metadata operations somehow succeeded after a few retries, the tracing context will have that many retry count in it. Now when actual call for create is made, same retry count will be used to construct the headers(clientCorrelationId). Alhough the create operation never failed, we will still see retry count from the previous request.

Fix is to use a new tracing context object for all the network calls made. All the sub-sequential and parallel operations will have same primary request Id to correlate them, yet they will have their own tracing of retry count.

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 ...')?
Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
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?

hadoop-yetus · 2023-09-04T06:39:15Z

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hadoop-yetus · 2023-09-27T07:11:39Z

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steveloughran

apart from that javadoc nit (some jvms blow up there) no changes to production code. test wise just make sure file are closed and filesystems too. Mockito tests are always too complex to review/maintain, so I won't commment there -at a glance they look ok

steveloughran · 2023-10-09T16:20:31Z

...ols/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsRestOperation.java

  private String failureReason;

+  /**
+   * This variable stores the tracing context used for last Rest Operation


add a . so all javadoc versions are happy. some JVMs blow up here

steveloughran · 2023-10-09T16:22:19Z

...hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/ITestAzureBlobFileSystemDelete.java

+    spiedStore.setClient(spiedClient);
+
+    fs.mkdirs(new Path("/testDir"));
+    fs.create(new Path("/testDir/file1"));


add .close() or is mockito so involved these are no-ops?

Added fs.close()

anujmodi2021 · 2023-11-06T15:59:05Z

Thanks for the review @steveloughran
Added fs.close() wherever applicable or enclosed FS creation inside a try.

steveloughran · 2023-11-06T17:17:51Z

reviewing
@anujmodi2021 can you avoid doing rebase/forced push when we are in those final review stages; as long as there are no merge problems it helps reviewers as we can easily review changes since their last review. thanks

hadoop-yetus · 2023-11-06T17:27:10Z

🎊 +1 overall

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steveloughran

afraid I went and reviewed the whole patch, because github didn't give me much choice. so added commentary about method names/javadocs in AbfsClientTestUtil. sorry. and next time, make it easier for both of us by not rebasing, please

steveloughran · 2023-11-06T17:20:41Z

...op-azure/src/test/java/org/apache/hadoop/fs/azurebfs/ITestAzureBlobFileSystemListStatus.java

+    List<FileStatus> fileStatuses = new ArrayList<>();
+    spiedStore.listStatus(new Path("/"), "", fileStatuses, true, null, spiedTracingContext);
+
+    // Assert that there were 2 paginated ListPath calls were made.


is this really verify 2 calls, or 1? I don't care which, only that the comment is consistent

2 calls were made one with continuation token and one without continuation token

Updated the comments to remove confusion.

...ls/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/services/AbfsClientTestUtil.java

anujmodi2021 · 2023-11-08T09:10:15Z

Hi @steveloughran
Really sorry for making it difficult for you. There were some merge conflicts that I wanted to resolve.
I later learned that instead of using a git rebase, I should have used git merge.

I will keep this in mind for all my future PRs. Kindly request you to please take the effort this time and review the PRs.
Apologies again.

hadoop-yetus · 2023-11-08T10:34:15Z

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steveloughran · 2023-11-13T19:35:12Z

Really sorry for making it difficult for you.
no worries -I need to apologise for not giving the abfs code enough attention, either in reviews or my own work

steveloughran

LGTM
+1

steveloughran · 2023-11-13T19:37:22Z

merged! Anuj -can you do a branch-3.3 backport and retest...mukund has been getting his signing setup for a 3.3.x release

…tial and Parallel Operations (apache#6019) Contributed by Anuj Modi

github-actions bot added trunk TOOLS ABFS labels Sep 4, 2023

anujmodi2021 changed the title ~~Hadoop 18872 tracing fix~~ HADOOP-18872: [ABFS] [BugFix] Misreporting Retry Count for Sub-sequential and Parallel Operations Sep 4, 2023

anujmodi2021 force-pushed the HADOOP-18872-tracingFix branch from dc2f952 to 140c78b Compare September 27, 2023 04:59

anujmodi2021 marked this pull request as ready for review September 27, 2023 05:00

steveloughran requested changes Oct 9, 2023

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Anuj Modi added 5 commits November 6, 2023 07:44

Production Code Changes

31866ff

Fixing Failing Tests

b64a727

Fixing Failing Tests

bae30db

Added Tests For Production Code Changes

d8bfb18

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Addressed Comments

25cc6d9

anujmodi2021 force-pushed the HADOOP-18872-tracingFix branch from 140c78b to 25cc6d9 Compare November 6, 2023 16:00

anujmodi2021 requested a review from steveloughran November 6, 2023 16:01

steveloughran requested changes Nov 6, 2023

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213cdaa

steveloughran approved these changes Nov 13, 2023

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steveloughran merged commit 000a39b into apache:trunk Nov 13, 2023

anujmodi2021 added a commit to anujmodi2021/hadoop that referenced this pull request Nov 21, 2023

HADOOP-18872: [ABFS] [BugFix] Misreporting Retry Count for Sub-sequen…

e4e7d1b

…tial and Parallel Operations (apache#6019) Contributed by Anuj Modi

anujmodi2021 mentioned this pull request Nov 21, 2023

HADOOP-18872: [Backport to 3.3] [ABFS] [BugFix] Misreporting Retry Count for Sub-sequential and Parallel Operations #6284

Closed

jiajunmao pushed a commit to jiajunmao/hadoop-MLEC that referenced this pull request Feb 6, 2024

HADOOP-18872: [ABFS] [BugFix] Misreporting Retry Count for Sub-sequen…

c08438f

…tial and Parallel Operations (apache#6019) Contributed by Anuj Modi

anujmodi2021 deleted the HADOOP-18872-tracingFix branch March 1, 2024 08:26

HADOOP-18872: [ABFS] [BugFix] Misreporting Retry Count for Sub-sequential and Parallel Operations #6019

HADOOP-18872: [ABFS] [BugFix] Misreporting Retry Count for Sub-sequential and Parallel Operations #6019

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anujmodi2021 commented Sep 4, 2023 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Description of PR

How was this patch tested?

For code changes:

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hadoop-yetus commented Sep 4, 2023

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hadoop-yetus commented Sep 27, 2023

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steveloughran Oct 9, 2023

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anujmodi2021 Nov 6, 2023

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anujmodi2021 commented Nov 6, 2023

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steveloughran commented Nov 6, 2023

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anujmodi2021 commented Nov 8, 2023

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hadoop-yetus commented Nov 8, 2023

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steveloughran commented Nov 13, 2023

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steveloughran commented Nov 13, 2023

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anujmodi2021 commented Sep 4, 2023 •

edited

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