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https://issues.apache.org/jira/browse/HDFS-13571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16984186#comment-16984186
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Yiqun Lin edited comment on HDFS-13571 at 11/28/19 7:09 AM:
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Deadnode detection is useful and will be a nice improvement in client side. I
help review and merge the change in recent sub-tasks. This feature is false by
default. Any further comments/suggestions for this improvement are welcomed.
Thanks [~leosun08] for the hard working and thanks [~xiegang112],
[~hexiaoqiao], [~weichiu], [~zhangchen] and [~zhangduo] for the discussions.
BTW, [~leosun08] , can you help add a release note for this JIRA?
was (Author: linyiqun):
Deadnode detection is useful and will be a nice improvement in client side. I
help review and merge the change in recent sub-tasks. This feature is false by
default. Any further comments/suggestions for this improvement are welcomed.
Thanks [~leosun08] for the hard working. BTW, can you help add a release note
for this JIRA?
> Dead DataNode Detector
> ----------------------
>
> Key: HDFS-13571
> URL: https://issues.apache.org/jira/browse/HDFS-13571
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.4.0, 2.6.0, 3.0.2
> Reporter: Gang Xie
> Assignee: Lisheng Sun
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: DeadNodeDetectorDesign.pdf, HDFS-13571-2.6.diff, node
> status machine.png
>
>
> Currently, the information of the dead datanode in DFSInputStream in stored
> locally. So, it could not be shared among the inputstreams of the same
> DFSClient. In our production env, every days, some datanodes dies with
> different causes. At this time, after the first inputstream blocked and
> detect this, it could share this information to others in the same DFSClient,
> thus, the ohter inputstreams are still blocked by the dead node for some
> time, which could cause bad service latency.
> To eliminate this impact from dead datanode, we designed a dead datanode
> detector, which detect the dead ones in advance, and share this information
> among all the inputstreams in the same client. This improvement has being
> online for some months and works fine. So, we decide to port to the 3.0 (the
> version used in our production env is 2.4 and 2.6).
> I will do the porting work and upload the code later.
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