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HDFS-14216. NullPointerException happens in NamenodeWebHdfs. Contributed by lujie. 

(cherry picked from commit 92b53c40f0)
This commit is contained in:
Surendra Singh Lilhore 2019-02-21 20:36:34 +05:30
parent 685a41f449
commit 2e939515df
2 changed files with 35 additions and 4 deletions
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14
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
View File

@ -273,11 +273,19 @@ public class NamenodeWebHdfsMethods {
for (String host : StringUtils
.getTrimmedStringCollection(excludeDatanodes)) {
int idx = host.indexOf(":");
Node excludeNode = null;
if (idx != -1) {
excludes.add(bm.getDatanodeManager().getDatanodeByXferAddr(
host.substring(0, idx), Integer.parseInt(host.substring(idx + 1))));
excludeNode = bm.getDatanodeManager().getDatanodeByXferAddr(
host.substring(0, idx), Integer.parseInt(host.substring(idx + 1)));
} else {
excludes.add(bm.getDatanodeManager().getDatanodeByHost(host));
excludeNode = bm.getDatanodeManager().getDatanodeByHost(host);
}
if (excludeNode != null) {
excludes.add(excludeNode);
} else {
LOG.debug("DataNode {} was requested to be excluded, "
+ "but it was not found.", host);
}
}
}

23
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/web/resources/TestWebHdfsDataLocality.java
View File

@ -239,6 +239,29 @@ public class TestWebHdfsDataLocality {
}
}
@Test
public void testExcludeWrongDataNode() throws Exception {
final Configuration conf = WebHdfsTestUtil.createConf();
final String[] racks = {RACK0};
final String[] hosts = {"DataNode1"};
final int nDataNodes = hosts.length;
final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.hosts(hosts).numDataNodes(nDataNodes).racks(racks).build();
try {
cluster.waitActive();
final NameNode namenode = cluster.getNameNode();
NamenodeWebHdfsMethods.chooseDatanode(
namenode, "/path", PutOpParam.Op.CREATE, 0,
DFSConfigKeys.DFS_BLOCK_SIZE_DEFAULT,
"DataNode2", LOCALHOST, null);
} catch (Exception e) {
Assert.fail("Failed to exclude DataNode2" + e.getMessage());
} finally {
cluster.shutdown();
}
}
@Test
public void testChooseDatanodeBeforeNamesystemInit() throws Exception {
NameNode nn = mock(NameNode.class);