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HDFS-17064. Document the usage of the new Balancer "sortTopNodes" and "hotBlockTimeInterval" parameter (#5794). Contributed by Haiyang Hu.

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Reviewed-by: Shuyan Zhang <zqingchai@gmail.com>
Reviewed-by: He Xiaoqiao <hexiaoqiao@apache.org>
Signed-off-by: Ayush Saxena <ayushsaxena@apache.org>
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huhaiyang 2023-07-10 15:38:47 +08:00 committed by GitHub
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2 changed files with 5 additions and 2 deletions
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4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
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@ -206,9 +206,9 @@ public class Balancer {
+ "on over-utilized machines." + "on over-utilized machines."
+ "\n\t[-asService]\tRun as a long running service." + "\n\t[-asService]\tRun as a long running service."
+ "\n\t[-sortTopNodes]" + "\n\t[-sortTopNodes]"
+ "\n\t[-hotBlockTimeInterval]\tprefer to move cold blocks."
+ "\tSort datanodes based on the utilization so " + "\tSort datanodes based on the utilization so "
+ "that highly utilized datanodes get scheduled first."; + "that highly utilized datanodes get scheduled first."
+ "\n\t[-hotBlockTimeInterval]\tprefer to move cold blocks.";
@VisibleForTesting @VisibleForTesting
private static volatile boolean serviceRunning = false; private static volatile boolean serviceRunning = false;

3
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md
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@ -292,6 +292,8 @@ Usage:
[-idleiterations <idleiterations>] [-idleiterations <idleiterations>]
[-runDuringUpgrade] [-runDuringUpgrade]
[-asService] [-asService]
[-sortTopNodes]
[-hotBlockTimeInterval <specified time interval>]
| COMMAND\_OPTION | Description | | COMMAND\_OPTION | Description |
|:---- |:---- | |:---- |:---- |
@ -304,6 +306,7 @@ Usage:
| `-idleiterations` \<iterations\> | Maximum number of idle iterations before exit. This overwrites the default idleiterations(5). | | `-idleiterations` \<iterations\> | Maximum number of idle iterations before exit. This overwrites the default idleiterations(5). |
| `-runDuringUpgrade` | Whether to run the balancer during an ongoing HDFS upgrade. This is usually not desired since it will not affect used space on over-utilized machines. | | `-runDuringUpgrade` | Whether to run the balancer during an ongoing HDFS upgrade. This is usually not desired since it will not affect used space on over-utilized machines. |
| `-asService` | Run Balancer as a long running service. | | `-asService` | Run Balancer as a long running service. |
| `-sortTopNodes` | Sort datanodes based on the utilization so that highly utilized datanodes get scheduled first. |
| `-hotBlockTimeInterval` | Prefer moving cold blocks i.e blocks associated with files accessed or modified before the specified time interval. | | `-hotBlockTimeInterval` | Prefer moving cold blocks i.e blocks associated with files accessed or modified before the specified time interval. |
| `-h`\|`--help` | Display the tool usage and help information and exit. | | `-h`\|`--help` | Display the tool usage and help information and exit. |