wangwenli created HADOOP-12529:
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Summary: UserGroupInformation equals method depend on the subject
object address
Key: HADOOP-12529
URL: https://issues.apache.org/jira/browse/HADOOP-12529
Project: Hadoop Common
Issue Type: Bug
Components: security
Affects Versions: 2.7.1
Reporter: wangwenli
my question is why UserGroupInformation equals method depend on the subject
object?
try below code which is extract from HiveMetaStore:
{code:title=TestUgi.java|borderStyle=solid}
UserGroupInformation clientUgi = null;
UserGroupInformation clientUgi2 = null;
try {
clientUgi = UserGroupInformation.createProxyUser("user2",
UserGroupInformation.getLoginUser());
clientUgi2 = UserGroupInformation.createProxyUser("user2",
UserGroupInformation.getLoginUser());
if (clientUgi.equals(clientUgi2)) {
System.out.println("==");
} else {
System.out.println("!="); // strangely this will be hit
}
} catch (IOException e1) {
e1.printStackTrace();
}
{code}
i found that it is because the equal method from UserGroupInformation is
compare on subject object ref : subject == ((UserGroupInformation) o).subject;
.
as you know, ipc.Client connect to namenode,
connections.get(ConnectionId) this code will try to reuse the same socket to
namenode, but because of ConnectionId's equal depend on ugi equal, which will
cause connections.get(ConnectionId) cann't get the same socket, suppose many
connect to HiveMetaStore, then many connection to Namenode will established.
so my doubts is why UserGroupInformation is compare on subject object ref
: subject == ((UserGroupInformation) o).subject, it should compare on
subject's principal, am i right?
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