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Posted to hdfs-issues@hadoop.apache.org by "Tong Wu (JIRA)" <ji...@apache.org> on 2018/11/30 02:00:00 UTC
[jira] [Commented] (HDFS-9572) Prevent DataNode log spam if a
client connects on the data transfer port but sends no data.
[ https://issues.apache.org/jira/browse/HDFS-9572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16704145#comment-16704145 ]
Tong Wu commented on HDFS-9572:
-------------------------------
[~cnauroth] Is it possible throw {{EOFException}} or CloseChannelException because of any real problems, such as connetions disconnected? Thank you in advance
> Prevent DataNode log spam if a client connects on the data transfer port but sends no data.
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-9572
> URL: https://issues.apache.org/jira/browse/HDFS-9572
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Priority: Major
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HDFS-9572.001.patch
>
>
> Monitoring tools may choose to check liveness of the DataNode's data transfer port by connecting to it. The monitoring tool will close the connection immediately after establishment without sending any data. When this happens, the DataNode encounters an unexpected EOF and logs a full stack trace. This creates unneeded noise in the logs.
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