[jira] [Created] (HDFS-17885) Fix TestDFSAdmin.testAllDatanodesReconfig flaky test

["Shilun Fan (Jira)" <ji...@apache.org>]

Shilun Fan created HDFS-17885:
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             Summary: Fix TestDFSAdmin.testAllDatanodesReconfig flaky test
                 Key: HDFS-17885
                 URL: https://issues.apache.org/jira/browse/HDFS-17885
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: dfsadmin
    Affects Versions: 3.5.0, 3.5.1
            Reporter: Shilun Fan
            Assignee: Shilun Fan


{*}Problem{*}{*}{*}
`TestDFSAdmin.testAllDatanodesReconfig` fails because it invokes reconfiguration twice on the same DataNodes, causing the second invocation to fail with "Another reconfiguration task is running."
 
*Solution*
- Start reconfiguration only once by calling `admin.startReconfigurationUtil()` directly
- Capture output to ByteArrayOutputStream for assertions
- Improve test robustness: use `NUM_DATANODES` constant, stream-based counting instead of fixed positions
- Remove unnecessary `Thread.sleep(1000)`
 
 
 



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