Standardize when we return false and when we throw IOException in FileSystem API
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Key: HADOOP-6499
URL: https://issues.apache.org/jira/browse/HADOOP-6499
Project: Hadoop Common
Issue Type: Improvement
Reporter: Zheng Shao
Currently most of the methods in Hadoop FileSystem has 2 ways of returning
errors:
1. Return false
2. throw an IOException
We should standardize what should happen in what case, so that the caller can
retry/fail accordingly.
The standard can be added to javadoc of FileSystem, then we need to verify all
FileSystem implementation follow the same standard.
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