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https://issues.apache.org/jira/browse/HADOOP-13739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15595023#comment-15595023
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Kihwal Lee commented on HADOOP-13739:
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Reads don't leave any file-level state on namenode. If reads were stateful,
hdfs wouldn't scale. A lease obtained during create or append is the closest
thing to file locking.
> Add the ability to check - is a file opened for writing
> -------------------------------------------------------
>
> Key: HADOOP-13739
> URL: https://issues.apache.org/jira/browse/HADOOP-13739
> Project: Hadoop Common
> Issue Type: New Feature
> Reporter: VITALIY SAVCHENKO
>
> I want to merge some MapFile's to one via MapFile.Merger. But i want to be
> sure, what no one of file not open for wrinting now.
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