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HDFS-13728. Disk Balancer should not fail if volume usage is greater than capacity. Contributed by Stephen O'Donnell. 

(cherry picked from commit 6677717c68)
This commit is contained in:
Xiao Chen 2018-08-07 22:04:41 -07:00
parent f2768eaa38
commit bf03b25f4b
2 changed files with 28 additions and 5 deletions
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17
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.java
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@ -21,9 +21,10 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectReader;
import com.google.common.base.Preconditions;
import org.apache.hadoop.hdfs.web.JsonUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
@ -35,6 +36,9 @@ public class DiskBalancerVolume {
private static final ObjectReader READER =
new ObjectMapper().readerFor(DiskBalancerVolume.class);
private static final Logger LOG =
LoggerFactory.getLogger(DiskBalancerVolume.class);
private String path;
private long capacity;
private String storageType;
@ -269,10 +273,13 @@ public class DiskBalancerVolume {
* @param dfsUsedSpace - dfsUsedSpace for this volume.
*/
public void setUsed(long dfsUsedSpace) {
Preconditions.checkArgument(dfsUsedSpace < this.getCapacity(),
"DiskBalancerVolume.setUsed: dfsUsedSpace(%s) < capacity(%s)",
dfsUsedSpace, getCapacity());
this.used = dfsUsedSpace;
if (dfsUsedSpace > this.getCapacity()) {
LOG.warn("Volume usage ("+dfsUsedSpace+") is greater than capacity ("+
this.getCapacity()+"). Setting volume usage to the capacity");
this.used = this.getCapacity();
} else {
this.used = dfsUsedSpace;
}
}
/**

16
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/diskbalancer/TestDataModels.java
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@ -224,4 +224,20 @@ public class TestDataModels {
Assert
.assertEquals(cluster.getNodes().size(), newCluster.getNodes().size());
}
@Test
public void testUsageLimitedToCapacity() throws Exception {
DiskBalancerTestUtil util = new DiskBalancerTestUtil();
// If usage is greater than capacity, then it should be set to capacity
DiskBalancerVolume v1 = util.createRandomVolume(StorageType.DISK);
v1.setCapacity(DiskBalancerTestUtil.GB);
v1.setUsed(2 * DiskBalancerTestUtil.GB);
Assert.assertEquals(v1.getUsed(),v1.getCapacity());
// If usage is less than capacity, usage should be set to the real usage
DiskBalancerVolume v2 = util.createRandomVolume(StorageType.DISK);
v2.setCapacity(2*DiskBalancerTestUtil.GB);
v2.setUsed(DiskBalancerTestUtil.GB);
Assert.assertEquals(v1.getUsed(),DiskBalancerTestUtil.GB);
}
}