Varun Saxena created YARN-4321:
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Summary: Incessant retries if NoAuthException is thrown by
Zookeeper in non HA mode
Key: YARN-4321
URL: https://issues.apache.org/jira/browse/YARN-4321
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager
Affects Versions: 2.7.1
Reporter: Varun Saxena
Assignee: Varun Saxena
This applies to only branch-2.7 or earlier code.
When a {{NoAuthException}} is thrown in non HA mode(like in the scenario of
YARN-4127), RM incessantly keeps on retrying the ZK operation.
{noformat}
2015-10-23 09:22:10,209 DEBUG [SyncThread:0] server.DataTree
(DataTree.java:processTxn(949)) - Ignoring processTxn failure hdr: -1 : error:
-102
2015-10-23 09:22:10,210 DEBUG [main-SendThread(127.0.0.1:11221)]
zookeeper.ClientCnxn (ClientCnxn.java:readResponse(818)) - Reading reply
sessionid:0x15092d1ebe10001, packet:: clientPath:null serverPath:null
finished:false header:: 7591,1 replyHeader:: 7591,7610,-102 request::
'/rmstore/ZKRMStateRoot/RMAppRoot,,v{s{31,s{'world,'anyone}}},0 response::
2015-10-23 09:22:10,210 INFO [ProcessThread(sid:0 cport:-1):]
server.PrepRequestProcessor (PrepRequestProcessor.java:pRequest(645)) - Got
user-level KeeperException when processing sessionid:0x15092d1ebe10001
type:create cxid:0x1da8 zxid:0x1dbb txntype:-1 reqpath:n/a Error Path:null
Error:KeeperErrorCode = NoAuth
{noformat}
This is because we do not handle NoAuthException properly in branch-2.7 code
when HA is not enabled.
In {{ZKRMStateStore#runWithRetries}}, we have code as under. As can be seen if
HA is not enabled, we neither rethrow NoAuthException nor do we have any logic
to increment retries and back out if retries are maxed out.
{code}
T runWithRetries() throws Exception {
int retry = 0;
while (true) {
try {
return runWithCheck();
} catch (KeeperException.NoAuthException nae) {
if (HAUtil.isHAEnabled(getConfig())) {
// NoAuthException possibly means that this store is fenced due to
// another RM becoming active. Even if not,
// it is safer to assume we have been fenced
throw new StoreFencedException();
}
} catch (KeeperException ke) {
.............
}
}
}
{code}
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