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https://issues.apache.org/jira/browse/HDFS-585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12751545#action_12751545
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Hairong Kuang commented on HDFS-585:
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1. The patch does not handle the case that bytesOnDisk is less than
visibleLength.
2. If the last chunk read is not full, there is a chance that writer is
updating the chunk's crc while the reader is reading the crc. So the client
might get an unexpected ChecksumError. I believe that this is a bug in the
trunk too.
3. Shall we allow a DataNode to serve read even if its replica's GS is newer
than the block gs in the request?
4. minor: could you please change toString() in FinalizedReplicaInfo as well?
> Datanode should serve up to visible length of a replica for read requests
> -------------------------------------------------------------------------
>
> Key: HDFS-585
> URL: https://issues.apache.org/jira/browse/HDFS-585
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: data-node
> Affects Versions: Append Branch
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: Append Branch
>
> Attachments: h585_20090903.patch
>
>
> As a part of the design in HDFS-265, datanodes should return all bytes within
> the visible length of a replica to the DFSClient in order to support read
> consistency.
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