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

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Co-authored-by: gf13871 <gf13871@ly.com>
Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
(cherry picked from commit 046a6204b4)
This commit is contained in:
GuoPhilipse 2022-03-27 21:23:48 +08:00 committed by Akira Ajisaka
parent ab5ea272ec
commit 6300fc1fcd
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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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@ -1602,7 +1602,7 @@
<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 void testVolumeIteratorWithCaching() throws Exception {
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());
}
}