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https://issues.apache.org/jira/browse/HDFS-16974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17710053#comment-17710053
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ASF GitHub Bot commented on HDFS-16974:
---------------------------------------
Hexiaoqiao commented on code in PR #5541:
URL: https://github.com/apache/hadoop/pull/5541#discussion_r1161425144
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/HeartbeatManager.java:
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@@ -183,6 +183,10 @@ public int getInServiceXceiverCount() {
public int getNumDatanodesInService() {
return stats.getNodesInService();
}
+
+ public int getInServiceAvailableVolumeCount() {
Review Comment:
+ it is better to define this interface at `DatanodeStatistics`.
> Consider load of every volume when choosing target
> --------------------------------------------------
>
> Key: HDFS-16974
> URL: https://issues.apache.org/jira/browse/HDFS-16974
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Shuyan Zhang
> Assignee: Shuyan Zhang
> Priority: Major
> Labels: pull-request-available
>
> The current target choosing policy only considers the load of the entire
> datanode. If both DN1 and DN2 have an `xceiverCount` of 100, but DN1 has 10
> volumes to write to and DN2 only has 1, then the pressure on DN2 is actually
> much greater than that on DN1. This patch has added a configuration that
> allows us to avoid nodes with too much pressure on a single volume when
> choosing targets, so as to avoid overloading datanodes with few volumes or
> slowing down writes.
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