SecondaryNameNode:  should not throw exception and exit if only one makedir 
failure
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                 Key: HADOOP-5730
                 URL: https://issues.apache.org/jira/browse/HADOOP-5730
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.19.1
            Reporter: Wang Xu
            Assignee: Wang Xu
             Fix For: 0.19.2


In CheckpointStorage.startCheckPointing(), if one mkdir failed, it 
will throw an exception and exit. 

However, because the editlog has been closed before, the editStreams
of FSEditLog of NameNode will becomes empty as a result, which
will affect any further logSync operations.

Hence we think it should only print  WARN message instead of 
throw the exception

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