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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2021/11/26 19:22:31 UTC

[GitHub] [hadoop] virajjasani opened a new pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

virajjasani opened a new pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730


   ### Description of PR
   HttpFS should support getSnapshotDiffReportListing API for improved snapshot diff.
   
   ### How was this patch tested?
   Local testing. Added some tests in httpfs module.
   
   ### For code changes:
   
   - [X] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
   


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[GitHub] [hadoop] hadoop-yetus commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-983781223


   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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[GitHub] [hadoop] hadoop-yetus commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-980444903


   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   This message was automatically generated.
   
   


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[GitHub] [hadoop] hadoop-yetus commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-980472480


   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   This message was automatically generated.
   
   


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[GitHub] [hadoop] iwasakims commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
iwasakims commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-983562771


   @virajjasani 
   LGTM overall. I'm not confident that making the `getSnapshotDiffReportListing` of DistributedFileSystem and WebHdfsFileSystem public is right while I have no idea of alternative. Exposing DFSClient to HttpFS is not good. I would like to wait for comments from another reviewers for some time.
   
   HttpFSFileSystem might be able to leverage `DFSUtilClient#getSnapshotDiffReport`. It can be addressed in follow-up JIRAs.


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[GitHub] [hadoop] virajjasani commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
virajjasani commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-980447545


   @iwasakims @jojochuang @aajisaka Could you please take a look?


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[GitHub] [hadoop] virajjasani commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
virajjasani commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-982369919


   @ferhui @tasanuma could you please take a look?


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[GitHub] [hadoop] virajjasani commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
virajjasani commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-983647264


   Thanks for taking a look.
   
   > I'm not confident that making the getSnapshotDiffReportListing of DistributedFileSystem and WebHdfsFileSystem public is right while I have no idea of alternative.
   
   I have made WebHdfsFileSystem#getSnapshotDiffReportListing public only because of test usage, so let me make it as `@VisibleForTesting` and provide comment as well.
   
   
   > Exposing DFSClient to HttpFS is not good.
   
   On the other hand, almost every other HttpFS APIs use DFSClient (through DFS) e.g. `getSnapshotListing`, `getSnapshottableDirListing`, even `DFS#access` is used directly by HttpFS. Though these APIs are accessed only if DFS is used (same logic applicable for this change). I am wondering what problem it can cause here. Is there any known issues similar to WebHdfsFileSystem using NameNode APIs directly (i.e. `NamenodeWebHdfsMethods` should utilize RPC Client Protocol rather than accessing FileSystem APIs directly).
   
   
   > HttpFSFileSystem might be able to leverage `DFSUtilClient#getSnapshotDiffReport`. It can be addressed in follow-up JIRAs.
   
   Sounds good, however, I have the same question as above that majority of HttpFS APIs still directly use DFSClient if the underlying FileSystem is DFS. Does this cause any known issues?
   Also, I just again took a look at majority sub-classes of `FSOperations` that are used by HttpFs and majority of them are directly using FileSystem APIs (for DFS specific functionality, we check whether underlying FS is DFS, if not we throw `UnsupportedOperationException`).
   
   Thanks @iwasakims, let me add `@VFT` on WebHdfsFileSystem#getSnapshotDiffReportListing to be more specific about it's usage policy.


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[GitHub] [hadoop] virajjasani commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
virajjasani commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-981480689


   Minor refactor in the latest commit.


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[GitHub] [hadoop] hadoop-yetus commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-981596729


   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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[GitHub] [hadoop] iwasakims merged pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
iwasakims merged pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730


   


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[GitHub] [hadoop] virajjasani commented on pull request #3730: HDFS-16358. HttpFS implementation for getSnapshotDiffReportListing

Posted by GitBox <gi...@apache.org>.
virajjasani commented on pull request #3730:
URL: https://github.com/apache/hadoop/pull/3730#issuecomment-984318756


   > BTW TestHttpFSFWithSWebhdfsFileSystem is currently failing consistently in trunk. So we really need to fix it. (how did we miss it before?)
   
   Thanks @jojochuang. These tests are passing as per QA results on this PR: 
   https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3730/4/testReport/org.apache.hadoop.fs.http.client/
   https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3730/3/testReport/org.apache.hadoop.fs.http.client/
   
   I am not 100% sure why the test was missed but I guess it's because when a change is made to WebHdfs module explicitly, Httpfs tests are not run by QA and hence any existing test failure might be missed.


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