[
https://issues.apache.org/jira/browse/HDFS-101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Hairong Kuang updated HDFS-101:
-------------------------------
Attachment: detectDownDN-0.20.patch
This is a patch for 0.20. 0.20 seems to differ from 0.21/trunk quite a bit.
This patch also includes the fix to HDFS-637. I have not tested this patch on
0.20 yet since we do not the fault injection framework in 0.20. It would be
great if Todd could test it in your cluster. Thanks a lot.
> DFS write pipeline : DFSClient sometimes does not detect second datanode
> failure
> ---------------------------------------------------------------------------------
>
> Key: HDFS-101
> URL: https://issues.apache.org/jira/browse/HDFS-101
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.20.1
> Reporter: Raghu Angadi
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.21.0
>
> Attachments: detectDownDN-0.20.patch, detectDownDN.patch
>
>
> When the first datanode's write to second datanode fails or times out
> DFSClient ends up marking first datanode as the bad one and removes it from
> the pipeline. Similar problem exists on DataNode as well and it is fixed in
> HADOOP-3339. From HADOOP-3339 :
> "The main issue is that BlockReceiver thread (and DataStreamer in the case of
> DFSClient) interrupt() the 'responder' thread. But interrupting is a pretty
> coarse control. We don't know what state the responder is in and interrupting
> has different effects depending on responder state. To fix this properly we
> need to redesign how we handle these interactions."
> When the first datanode closes its socket from DFSClient, DFSClient should
> properly read all the data left in the socket.. Also, DataNode's closing of
> the socket should not result in a TCP reset, otherwise I think DFSClient will
> not be able to read from the socket.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
