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HADOOP-19052.Hadoop use Shell command to get the count of the hard link which takes a lot of time

Open liangyu-1 opened this issue 1 year ago • 5 comments

Description of PR

As described in HADOOP_19052. When we try to append a file, we will execute method getHardLinkCount twice. When we execute method getHardLinkCount java will start a new process to execute a shell command and wait for it to fork. When the QPS of append execution is very high, method getHardLinkCount will take a long time to finish which will cause a long-time wait to acquire lock.

I used another method to get the linkCount of a file whose file store supports the file attributes identified by the given file attribute view. This method does not start a new process and will finish in very short time even if the QPS of append execution is high.

How was this patch tested?

I add a new UT testGetLinkCountFromFileAttribute and a public method supportsHardLink to get whether or not this file store supports the file attributes identified by the given file attribute view.

For code changes:

  • [x] 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?

liangyu-1 avatar Feb 26 '24 05:02 liangyu-1

:broken_heart: -1 overall

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hadoop-yetus avatar Mar 13 '24 13:03 hadoop-yetus

@liangyu-1 Thank you for your contribution! Could you please mention the version of the operating system you are using? I noticed in the JIRA description that the methods you provided seem to be available only on operating systems that support Unix attributes. If only some operating systems support it, we need to add configuration to ensure that this feature is opt-in, meaning users default to the original logic, but if the system supports Unix attributes, the option is enabled to enhance performance.

slfan1989 avatar Mar 14 '24 01:03 slfan1989

@slfan1989 Thanks for reply. We have add a judgement function supportsHardLink() to check if we can use Files.getAttribute() to get the hardlLink count. Thus this will not cause a exception if we are on other operating systems.

liangyu-1 avatar Mar 14 '24 07:03 liangyu-1

:broken_heart: -1 overall

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hadoop-yetus avatar Mar 15 '24 06:03 hadoop-yetus

:broken_heart: -1 overall

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hadoop-yetus avatar Mar 15 '24 11:03 hadoop-yetus

LGTM.

slfan1989 avatar Mar 15 '24 23:03 slfan1989

@liangyu-1 Can we fix the checkstyle issue?

slfan1989 avatar Mar 20 '24 01:03 slfan1989

:confetti_ball: +1 overall

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hadoop-yetus avatar Mar 20 '24 05:03 hadoop-yetus

@slfan1989 Hi, I have just fixed the checkstyle warnings.

liangyu-1 avatar Mar 20 '24 06:03 liangyu-1

:confetti_ball: +1 overall

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hadoop-yetus avatar Mar 20 '24 13:03 hadoop-yetus

LGTM.

@liangyu-1 According to the process, we need to wait for 2 working days. If there are no further feedback, we will merge this PR.

slfan1989 avatar Mar 21 '24 13:03 slfan1989

@liangyu-1 Thanks for the contribution! merged into trunk.

slfan1989 avatar Mar 24 '24 02:03 slfan1989