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https://issues.apache.org/jira/browse/HADOOP-4292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637245#action_12637245
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Raghu Angadi commented on HADOOP-4292:
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> The "append" design (HADOOP-1700) allows for the fact that we coudl support
> multiple concurrent appenders in future. This means that handling the last
> partial chunk is best handled in the server and not in the client.
ChecksumFileSystem is managed only on the client. It won't work for multiple
appenders, just like it does not work for multiple writers now. Note that
DFSOutputStream is _not_ a ChecksumFileSystem. Not sure if this is related to
HADOOP-1700 at all.
> append() does not work for LocalFileSystem
> ------------------------------------------
>
> Key: HADOOP-4292
> URL: https://issues.apache.org/jira/browse/HADOOP-4292
> Project: Hadoop Core
> Issue Type: Bug
> Components: fs
> Affects Versions: 0.18.0, 0.19.0
> Reporter: Raghu Angadi
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.18.2, 0.19.0
>
>
> append is supported by LocalFileSystem but it does not update crc when a file
> is appended.
> When you enable checksum verification {{TestLocalFileSystem.testAppend}}
> fails. Since HADOOP-4277 is a blocker for 0.17 I am planning to disable this
> test in HADOOP-4277.
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