haiyang1987 commented on a change in pull request #3596:
URL: https://github.com/apache/hadoop/pull/3596#discussion_r741696525
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
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@@ -260,17 +257,14 @@
final Timer timer = new Timer();
this.slowPeerTracker = dataNodePeerStatsEnabled ?
new SlowPeerTracker(conf, timer) : null;
- this.excludeSlowNodesEnabled = conf.getBoolean(
- DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_KEY,
- DFS_NAMENODE_BLOCKPLACEMENTPOLICY_EXCLUDE_SLOW_NODES_ENABLED_DEFAULT);
this.maxSlowPeerReportNodes = conf.getInt(
DFSConfigKeys.DFS_NAMENODE_MAX_SLOWPEER_COLLECT_NODES_KEY,
DFSConfigKeys.DFS_NAMENODE_MAX_SLOWPEER_COLLECT_NODES_DEFAULT);
this.slowPeerCollectionInterval = conf.getTimeDuration(
DFSConfigKeys.DFS_NAMENODE_SLOWPEER_COLLECT_INTERVAL_KEY,
DFSConfigKeys.DFS_NAMENODE_SLOWPEER_COLLECT_INTERVAL_DEFAULT,
TimeUnit.MILLISECONDS);
- if (slowPeerTracker != null && excludeSlowNodesEnabled) {
Review comment:
@tomscut Thank you for your review.
1.Current parameter 'dataNodePeerStatsEnabled' and 'excludeSlowNodesEnabled'
decision SlowPeerCollector thread whether to start ,But it didn't take into
account avoid SlowDataNodesForRead logic
2.So think about two phases:
a.The first is to start SlowPeerCollector thread
b.Second, you can control whether to enable read/write avoid slow datanode
according to dynamic parameters
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