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https://issues.apache.org/jira/browse/HDFS-570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750596#action_12750596
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Tsz Wo (Nicholas), SZE commented on HDFS-570:
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{quote}
ClientDatanodeProtocol
2. JavaDoc for getReplicaVisibleLength() is confusing. Could you please also
make it 3 lines rather than 1.
{quote}
Why 3 lines?
{quote}
LocatedBlock
3. Does not need any of the changes.
{quote}
Could you explain more?
{quote}
LocatedBlocks
4. Here you do multiple field and method renames, combined with reformatting. I
am lost.
{quote}
How can I help you?
{quote}
FSDatasetInterface
5. Why do you need to abstract getReplicaInfo()? It does not seem that
SimulatedFSDataset actually need it anywhere, at least not yet.
{quote}
FSDatasetInterface is an *interface*. By definition, all methods in an
interface must be abstract.
{quote}
BlockManager
6. You factored out a part of the code into a new method. I cannot see what the
new changes are.
{quote}
The new method is involved in FSNamesystem. Could you take a look again?
{quote}
INodeFile
8. It is not necessary to remove public from method declaration and remove
unused method.
{quote}
I remove the method because I see the following comment in the code.
{code}
// SHV !!! this is not used anywhere - remove
{code}
The comment was introduced by you in HDFS-517. Could you explain what does it
mean?
> When opening a file for read, make the file length avaliable to client.
> -----------------------------------------------------------------------
>
> Key: HDFS-570
> URL: https://issues.apache.org/jira/browse/HDFS-570
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs client
> Affects Versions: Append Branch
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: Append Branch
>
> Attachments: h570_20090828.patch
>
>
> In order to support read consistency, DFSClient needs the file length at the
> file opening time. In the current implmentation, DFSClient obtains the file
> length at the file opening time but the length is inaccurate if the file is
> being written.
> For more details, see Section 4 in the [append design
> doc|https://issues.apache.org/jira/secure/attachment/12415768/appendDesign2.pdf].
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