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https://issues.apache.org/jira/browse/HDFS-17305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18024825#comment-18024825
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ASF GitHub Bot commented on HDFS-17305:
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github-actions[bot] closed pull request #6393: HDFS-17305. Add avoid datanode
reason count related metrics to namenode.
URL: https://github.com/apache/hadoop/pull/6393
> Add avoid datanode reason count related metrics to namenode.
> ------------------------------------------------------------
>
> Key: HDFS-17305
> URL: https://issues.apache.org/jira/browse/HDFS-17305
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Zhaobo Huang
> Assignee: Zhaobo Huang
> Priority: Minor
> Labels: pull-request-available
>
> Now, there are slownode and load avoidance functions, mainly implemented in
> the BlockPlacementPolicyDefault class.
> 1. After triggering the exclusion condition, some logs will be printed on nn,
> which can be used to troubleshoot anomalies in nn by checking the logs, the
> code is as follows:
> {code:java}
> ...
> if (!node.isInService()) {
> logNodeIsNotChosen(node, NodeNotChosenReason.NOT_IN_SERVICE);
> return false;
> }
> if (avoidStaleNodes) {
> if (node.isStale(this.staleInterval)) {
> logNodeIsNotChosen(node, NodeNotChosenReason.NODE_STALE);
> return false;
> }
> }
> ...{code}
> 2. If the exclusion condition is triggered, we can record it through metrics
> and count the total number of exclusions.
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