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https://issues.apache.org/jira/browse/HDFS-4956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702551#comment-13702551
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Suresh Srinivas commented on HDFS-4956:
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bq. yes, It seems only fix in DistributedFileSystem and DFSClient, because
FSNamesystem has been considered it.
I am not sure what you mean here. Assuming what you mean is, DFSClient and
DistributedFileSystem does not handle it and FSNamesystem handles it, the right
way to do this is DistributedFileSystem/DFSClient should call append or create
based on the flags passed to them. Currently FSNamesystem has code that makes
it look like it handles it. However there are some differences between append
method and create. For example, create does not check if append feature is
supported. It also cannot return LocatedBlock with last incomplete block. The
FSNamesystem implementation is incorrect and incomplete.
> DistributedFileSystem does not handle CreateFlag.APPEND in create call
> ----------------------------------------------------------------------
>
> Key: HDFS-4956
> URL: https://issues.apache.org/jira/browse/HDFS-4956
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Suresh Srinivas
>
> Currently DistributedFileSystem does not handle CreateFlag.APPEND in the
> implementation of FileSystem#create() method. It only support OVERWRITE &
> CREATE or just CREATE.
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