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Date: Thu, 8 Jun 2017 22:42:19 +0000 (UTC)
From: "Sean Mackrory (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.13074888.1495728198000.33370.1496961739527@Atlassian.JIRA>
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Subject: [jira] [Updated] (HADOOP-14457) create() does not notify
 metadataStore of parent directories or ensure they're not existing files
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archived-at: Thu, 08 Jun 2017 22:42:28 -0000


     [ https://issues.apache.org/jira/browse/HADOOP-14457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Mackrory updated HADOOP-14457:
-----------------------------------
    Attachment: HADOOP-14457-HADOOP-13345.007.patch

This needed a minor tweak to be rebase on top of some other work that went in earlier today. This includes a direct test of the correct create() behavior in the MetadataStore, and also a test that create() over the top of tombstones doesn't have any other issues.

> create() does not notify metadataStore of parent directories or ensure they're not existing files
> -------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-14457
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14457
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Sean Mackrory
>            Assignee: Sean Mackrory
>         Attachments: HADOOP-14457-HADOOP-13345.001.patch, HADOOP-14457-HADOOP-13345.002.patch, HADOOP-14457-HADOOP-13345.003.patch, HADOOP-14457-HADOOP-13345.004.patch, HADOOP-14457-HADOOP-13345.005.patch, HADOOP-14457-HADOOP-13345.006.patch, HADOOP-14457-HADOOP-13345.007.patch
>
>
> Not a great test yet, but it at least reliably demonstrates the issue. LocalMetadataStore will sometimes erroneously report that a directory is empty with isAuthoritative = true when it *definitely* has children the metadatastore should know about. It doesn't appear to happen if the children are just directory. The fact that it's returning an empty listing is concerning, but the fact that it says it's authoritative *might* be a second bug.
> {code}
> diff --git a/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java b/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
> index 78b3970..1821d19 100644
> --- a/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
> +++ b/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
> @@ -965,7 +965,7 @@ public boolean hasMetadataStore() {
>    }
>  
>    @VisibleForTesting
> -  MetadataStore getMetadataStore() {
> +  public MetadataStore getMetadataStore() {
>      return metadataStore;
>    }
>  
> diff --git a/hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/contract/s3a/ITestS3AContractRename.java b/hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/contract/s3a/ITestS3AContractRename.java
> index 4339649..881bdc9 100644
> --- a/hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/contract/s3a/ITestS3AContractRename.java
> +++ b/hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/contract/s3a/ITestS3AContractRename.java
> @@ -23,6 +23,11 @@
>  import org.apache.hadoop.fs.contract.AbstractFSContract;
>  import org.apache.hadoop.fs.FileSystem;
>  import org.apache.hadoop.fs.Path;
> +import org.apache.hadoop.fs.s3a.S3AFileSystem;
> +import org.apache.hadoop.fs.s3a.Tristate;
> +import org.apache.hadoop.fs.s3a.s3guard.DirListingMetadata;
> +import org.apache.hadoop.fs.s3a.s3guard.MetadataStore;
> +import org.junit.Test;
>  
>  import static org.apache.hadoop.fs.contract.ContractTestUtils.dataset;
>  import static org.apache.hadoop.fs.contract.ContractTestUtils.writeDataset;
> @@ -72,4 +77,24 @@ public void testRenameDirIntoExistingDir() throws Throwable {
>      boolean rename = fs.rename(srcDir, destDir);
>      assertFalse("s3a doesn't support rename to non-empty directory", rename);
>    }
> +
> +  @Test
> +  public void testMkdirPopulatesFileAncestors() throws Exception {
> +    final FileSystem fs = getFileSystem();
> +    final MetadataStore ms = ((S3AFileSystem) fs).getMetadataStore();
> +    final Path parent = path("testMkdirPopulatesFileAncestors/source");
> +    try {
> +      fs.mkdirs(parent);
> +      final Path nestedFile = new Path(parent, "dir1/dir2/dir3/file4");
> +      byte[] srcDataset = dataset(256, 'a', 'z');
> +      writeDataset(fs, nestedFile, srcDataset, srcDataset.length,
> +          1024, false);
> +
> +      DirListingMetadata list = ms.listChildren(parent);
> +      assertTrue("MetadataStore falsely reports authoritative empty list",
> +          list.isEmpty() == Tristate.FALSE || !list.isAuthoritative());
> +    } finally {
> +      fs.delete(parent, true);
> +    }
> +  }
>  }
> {code}


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