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HDFS-13721. NPE in DataNode due to uninitialized DiskBalancer.

This commit is contained in:
Xiao Chen 2018-07-06 20:45:27 -07:00
parent ba68320449
commit 936e0df0d3
2 changed files with 18 additions and 6 deletions
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19
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
View File

@ -3132,7 +3132,7 @@ public class DataNode extends ReconfigurableBase
@Override // DataNodeMXBean
public String getDiskBalancerStatus() {
try {
return this.diskBalancer.queryWorkStatus().toJsonString();
return getDiskBalancer().queryWorkStatus().toJsonString();
} catch (IOException ex) {
LOG.debug("Reading diskbalancer Status failed. ex:{}", ex);
return "";
@ -3510,7 +3510,7 @@ public class DataNode extends ReconfigurableBase
DiskBalancerException.Result.DATANODE_STATUS_NOT_REGULAR);
}
this.diskBalancer.submitPlan(planID, planVersion, planFile, planData,
getDiskBalancer().submitPlan(planID, planVersion, planFile, planData,
skipDateCheck);
}
@ -3522,7 +3522,7 @@ public class DataNode extends ReconfigurableBase
public void cancelDiskBalancePlan(String planID) throws
IOException {
checkSuperuserPrivilege();
this.diskBalancer.cancelPlan(planID);
getDiskBalancer().cancelPlan(planID);
}
/**
@ -3533,7 +3533,7 @@ public class DataNode extends ReconfigurableBase
@Override
public DiskBalancerWorkStatus queryDiskBalancerPlan() throws IOException {
checkSuperuserPrivilege();
return this.diskBalancer.queryWorkStatus();
return getDiskBalancer().queryWorkStatus();
}
/**
@ -3550,9 +3550,9 @@ public class DataNode extends ReconfigurableBase
Preconditions.checkNotNull(key);
switch (key) {
case DiskBalancerConstants.DISKBALANCER_VOLUME_NAME:
return this.diskBalancer.getVolumeNames();
return getDiskBalancer().getVolumeNames();
case DiskBalancerConstants.DISKBALANCER_BANDWIDTH :
return Long.toString(this.diskBalancer.getBandwidth());
return Long.toString(getDiskBalancer().getBandwidth());
default:
LOG.error("Disk Balancer - Unknown key in get balancer setting. Key: {}",
key);
@ -3606,4 +3606,11 @@ public class DataNode extends ReconfigurableBase
}
return volumeInfoList;
}
private DiskBalancer getDiskBalancer() throws IOException {
if (this.diskBalancer == null) {
throw new IOException("DiskBalancer is not initialized");
}
return this.diskBalancer;
}
}

5
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/diskbalancer/TestDiskBalancer.java
View File

@ -109,6 +109,11 @@ public class TestDiskBalancer {
.getFsVolumeReferences()) {
assertEquals(ref.size(), dbDnNode.getVolumeCount());
}
// Shutdown the DN first, to verify that calling diskbalancer APIs on
// uninitialized DN doesn't NPE
dnNode.shutdown();
assertEquals("", dnNode.getDiskBalancerStatus());
} finally {
cluster.shutdown();
}