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Posted to hdfs-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2025/10/03 00:22:00 UTC
[jira] [Updated] (HDFS-17844) Flaky test: testViewFsMultipleExportPoint may encounter race condition which leads to namenode ID collisions
[ https://issues.apache.org/jira/browse/HDFS-17844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated HDFS-17844:
----------------------------------
Labels: patch pull-request-available (was: patch)
> Flaky test: testViewFsMultipleExportPoint may encounter race condition which leads to namenode ID collisions
> ------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-17844
> URL: https://issues.apache.org/jira/browse/HDFS-17844
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode, test
> Reporter: Yakun Wang
> Priority: Major
> Labels: patch, pull-request-available
>
> There could be a race condition in namenode ID generation, causing ID collisions. However, the underlying collision detection logic is incorrect because it throws an error as long as the namenode ID exists, even if the URI is the same. Same namenode ID with same URI is safe. What needs to be detected is that different URIs resolve to the same namenode ID, which is a security problem.
> Error output:
> `[ERROR] Errors:
> [ERROR] TestExportsTable.testViewFsMultipleExportPoint:111 ยป FileSystem FS:viewfs, Namenode ID collision for path:/hdfs2 nnid:2130740544 uri being added:hdfs://localhost:34111/ existing uri:hdfs://localhost:34111/`
> Functions that are related to collision detection logic:
> # prepareAddressMap in hadoop/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/DFSClientCache.java
> # getNamenodeId in hadoop/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/Nfs3Utils.java
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