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https://issues.apache.org/jira/browse/HDFS-16993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17725385#comment-17725385
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ASF GitHub Bot commented on HDFS-16993:
---------------------------------------
ayushtkn commented on code in PR #5597:
URL: https://github.com/apache/hadoop/pull/5597#discussion_r1202191052
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml:
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@@ -6419,6 +6419,15 @@
problem. In produce default set false, because it's have little
performance loss.
</description>
</property>
+
+ <property>
+ <name>dfs.datanode.networkerrors.display.topcount</name>
+ <value>10</value>
Review Comment:
by default it should be -1, and if it is -1 the behaviour should be like the
previous one, like today
> Datanode supports configure TopN DatanodeNetworkCounts
> ------------------------------------------------------
>
> Key: HDFS-16993
> URL: https://issues.apache.org/jira/browse/HDFS-16993
> Project: Hadoop HDFS
> Issue Type: Wish
> Affects Versions: 3.3.5
> Reporter: farmmamba
> Priority: Major
> Labels: pull-request-available
>
> In our prod environment, we try to collect datanode metrics every 15s through
> jmx_exporter. we found the datanodenetworkerror metric generates a lot.
> for example, if we have a cluster with 1000 datanodes, every datanode may
> generate 999 datanodenetworkerror metrics, and overall datanodes will
> generate 1000 multiple 999 = 999000 metrics. This is a very expensive
> operation. In most scenarios, we only need the topN of it.
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