[
https://issues.apache.org/jira/browse/HDFS-16396?focusedWorklogId=725870&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-725870
]
ASF GitHub Bot logged work on HDFS-16396:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 14/Feb/22 02:03
Start Date: 14/Feb/22 02:03
Worklog Time Spent: 10m
Work Description: tasanuma commented on a change in pull request #3827:
URL: https://github.com/apache/hadoop/pull/3827#discussion_r805442838
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/DataNodePeerMetrics.java
##########
@@ -57,26 +60,26 @@
* for outlier detection. If the number of samples is below this then
* outlier detection is skipped.
*/
- private final long minOutlierDetectionSamples;
+ private volatile long minOutlierDetectionSamples;
/**
* Threshold in milliseconds below which a DataNode is definitely not slow.
*/
- private final long lowThresholdMs;
+ private volatile long lowThresholdMs;
/**
* Minimum number of nodes to run outlier detection.
*/
- private final long minOutlierDetectionNodes;
+ private volatile long minOutlierDetectionNodes;
public DataNodePeerMetrics(final String name, Configuration conf) {
this.name = name;
minOutlierDetectionSamples = conf.getLong(
DFS_DATANODE_PEER_METRICS_MIN_OUTLIER_DETECTION_SAMPLES_KEY,
DFS_DATANODE_PEER_METRICS_MIN_OUTLIER_DETECTION_SAMPLES_DEFAULT);
lowThresholdMs =
- conf.getLong(DFSConfigKeys.DFS_DATANODE_SLOWPEER_LOW_THRESHOLD_MS_KEY,
+ conf.getLong(DFS_DATANODE_SLOWPEER_LOW_THRESHOLD_MS_KEY,
DFSConfigKeys.DFS_DATANODE_SLOWPEER_LOW_THRESHOLD_MS_DEFAULT);
minOutlierDetectionNodes =
-
conf.getLong(DFSConfigKeys.DFS_DATANODE_MIN_OUTLIER_DETECTION_NODES_KEY,
+ conf.getLong(DFS_DATANODE_MIN_OUTLIER_DETECTION_NODES_KEY,
DFSConfigKeys.DFS_DATANODE_MIN_OUTLIER_DETECTION_NODES_DEFAULT);
Review comment:
Why don't you import the static values of `..._DEFAULT` as well?
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/DataNodePeerMetrics.java
##########
@@ -57,26 +60,26 @@
* for outlier detection. If the number of samples is below this then
* outlier detection is skipped.
*/
- private final long minOutlierDetectionSamples;
+ private volatile long minOutlierDetectionSamples;
/**
* Threshold in milliseconds below which a DataNode is definitely not slow.
*/
- private final long lowThresholdMs;
+ private volatile long lowThresholdMs;
/**
* Minimum number of nodes to run outlier detection.
*/
- private final long minOutlierDetectionNodes;
+ private volatile long minOutlierDetectionNodes;
public DataNodePeerMetrics(final String name, Configuration conf) {
this.name = name;
minOutlierDetectionSamples = conf.getLong(
DFS_DATANODE_PEER_METRICS_MIN_OUTLIER_DETECTION_SAMPLES_KEY,
DFS_DATANODE_PEER_METRICS_MIN_OUTLIER_DETECTION_SAMPLES_DEFAULT);
lowThresholdMs =
- conf.getLong(DFSConfigKeys.DFS_DATANODE_SLOWPEER_LOW_THRESHOLD_MS_KEY,
+ conf.getLong(DFS_DATANODE_SLOWPEER_LOW_THRESHOLD_MS_KEY,
DFSConfigKeys.DFS_DATANODE_SLOWPEER_LOW_THRESHOLD_MS_DEFAULT);
minOutlierDetectionNodes =
-
conf.getLong(DFSConfigKeys.DFS_DATANODE_MIN_OUTLIER_DETECTION_NODES_KEY,
+ conf.getLong(DFS_DATANODE_MIN_OUTLIER_DETECTION_NODES_KEY,
DFSConfigKeys.DFS_DATANODE_MIN_OUTLIER_DETECTION_NODES_DEFAULT);
this.slowNodeDetector =
new OutlierDetector(minOutlierDetectionNodes, lowThresholdMs);
Review comment:
`this.slowNodeDetector` has to update `minOutlierDetectionNodes` and
`lowThresholdMs` after reconfiguring them, right?
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Issue Time Tracking
-------------------
Worklog Id: (was: 725870)
Time Spent: 3h 40m (was: 3.5h)
> Reconfig slow peer parameters for datanode
> ------------------------------------------
>
> Key: HDFS-16396
> URL: https://issues.apache.org/jira/browse/HDFS-16396
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: tomscut
> Assignee: tomscut
> Priority: Major
> Labels: pull-request-available
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> In large clusters, rolling restart datanodes takes a long time. We can make
> slow peers parameters and slow disks parameters in datanode reconfigurable to
> facilitate cluster operation and maintenance.
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