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HDFS-16355. Improve the description of dfs.block.scanner.volume.bytes.per.second (#3724) 

Co-authored-by: gf13871 <gf13871@ly.com>
Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
(cherry picked from commit 046a6204b4)

Change-Id: I2cae5d1c27a492d896da5338a92c7a86f88a8b43
This commit is contained in:
GuoPhilipse 2022-03-27 21:23:48 +08:00 committed by Steve Loughran
parent 52aba525c3
commit 63c07519de
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2 changed files with 12 additions and 6 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -1591,7 +1591,7 @@
<name>dfs.block.scanner.volume.bytes.per.second</name>
<value>1048576</value>
<description>
If this is 0, the DataNode's block scanner will be disabled. If this
If this is configured less than or equal to zero, the DataNode's block scanner will be disabled. If this
is positive, this is the number of bytes per second that the DataNode's
block scanner will try to scan from each volume.
</description>

16
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockScanner.java
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@ -282,11 +282,17 @@ public class TestBlockScanner {
public void testDisableVolumeScanner() throws Exception {
Configuration conf = new Configuration();
disableBlockScanner(conf);
TestContext ctx = new TestContext(conf, 1);
try {
Assert.assertFalse(ctx.datanode.getBlockScanner().isEnabled());
} finally {
ctx.close();
try(TestContext ctx = new TestContext(conf, 1)) {
assertFalse(ctx.datanode.getBlockScanner().isEnabled());
}
}
@Test(timeout=60000)
public void testDisableVolumeScanner2() throws Exception {
Configuration conf = new Configuration();
conf.setLong(DFS_BLOCK_SCANNER_VOLUME_BYTES_PER_SECOND, -1L);
try(TestContext ctx = new TestContext(conf, 1)) {
assertFalse(ctx.datanode.getBlockScanner().isEnabled());
}
}