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https://issues.apache.org/jira/browse/HDFS-609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881288#action_12881288
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Tom White commented on HDFS-609:
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Konstantin, This was one of those situations where the changes for this JIRA
had to be applied at the same time as its parent HADOOP-5438, so wasn't
possible to have Hudson check this patch either before or after HADOOP-5438 was
committed, so I did it manually. You're right about the tests. I should have
mentioned that I did run tests at the time I posted the patch - I'm re-running
them now to be sure I didn't miss anything.
> Create a file with the append flag does not work in HDFS
> --------------------------------------------------------
>
> Key: HDFS-609
> URL: https://issues.apache.org/jira/browse/HDFS-609
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Hairong Kuang
> Assignee: Tom White
> Priority: Blocker
> Fix For: 0.21.0
>
> Attachments: HDFS-609.patch
>
>
> HADOOP-5438 introduced a create API with flags. There are a couple of issues
> when the flag is set to be APPEND.
> 1. The APPEND flag does not work in HDFS. Append is not as simple as changing
> a FileINode to be a FileINodeUnderConstruction. It also need to reopen the
> last block for applend if last block is not full and handle crc when the last
> crc chunk is not full.
> 2. The API is not well thought. It has parameters like replication factor and
> blockSize. Those parameters do not make any sense if APPEND flag is set. But
> they give an application user a wrong impression that append could change a
> file's block size and replication factor.
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