JiangHua Zhu created HDFS-16733:
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Summary: Improve INode#isRoot()
Key: HDFS-16733
URL: https://issues.apache.org/jira/browse/HDFS-16733
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 3.3.0
Reporter: JiangHua Zhu
When constructing an INodeFile or INodeDirectory, it is usually necessary to
give a name. For getLocalNameBytes, there are not many restrictions, such as
null can be set. But an exception is thrown:
{code:java}
INodeDirectory root = new INodeDirectory(HdfsConstants.GRANDFATHER_INODE_ID,
null, perm, 0L);
{code}
Some exceptions:
{code:java}
java.lang.NullPointerException
at org.apache.hadoop.hdfs.server.namenode.INode.isRoot(INode.java:78)
at
org.apache.hadoop.hdfs.server.namenode.TestINodeFile.testIsRoot(TestINodeFile.java:1274)
{code}
Although these situations rarely occur in production environments, we should
refine the implementation of isRoot() to avoid this exception. This can enhance
system robustness.
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