多个PS时，怎么指定model_dir, 必须指定hdfs目录吗
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Description
@alinamimi @renyi533 请教3个PS时，model_dir 是不是只能指定hdfs目录呀，我指定了本地的同名目录，结果有错误，指定hdfs目录需要配置什么呀，目录格式是什么呢？
感谢解答！
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Research direction
Start by reproducing the reported setup with three parameter servers and a local model_dir, then compare it with an HDFS model_dir. Confirm whether HDFS is required, identify the necessary configuration and directory format, and document the expected working setup.
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Assessment
- Tech stack
- hadoop
- Domain
- distributed-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100