lujie created HDFS-14216:
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Summary: NullPointerException crash the NameNode
Key: HDFS-14216
URL: https://issues.apache.org/jira/browse/HDFS-14216
Project: Hadoop HDFS
Issue Type: Bug
Reporter: lujie
workload
{code:java}
curl -i -X PUT -T some.txt
"http://hadoop1:9870/webhdfs/v1/input?op=CREATE&excludedatanodes=hadoop2";
{code}
it will execute the code:
{code:java}
org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods.chooseDatanode{
excludes.add(bm.getDatanodeManager().getDatanodeByHost(host));//line280
}{code}
if hadoop2 is crash just before line280, then
bm.getDatanodeManager().getDatanodeByHost(host) will return null, hence NPE
happens
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