teamconfx opened a new pull request, #6090:
URL: https://github.com/apache/hadoop/pull/6090

   ### Description of PR
   
   When `dfs.datanode.volumes.replica-add.threadpool.size` is 0, HDFS cluster 
is never able to start and gets timed out eventually.
   
   To reproduce:
   1. set `dfs.datanode.volumes.replica-add.threadpool.size` to 0
   2. run `mvn surefire:test 
-Dtest=org.apache.hadoop.hdfs.server.namenode.metrics.TestNameNodeMetrics#testExcessBlocks`
   
   This PR improves the description of `replica-add.threadpool.size` in 
`hdfs-default.xml` by sepecifying that it should be positive; the PR also 
checks whether the value is positive before it is used to initialize 
`addReplicaThreadPool`.
   
   ### How was this patch tested?
   
   Unit test
   
   ### 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?
   
   


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