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https://issues.apache.org/jira/browse/HIVE-16071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893684#comment-15893684
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Chaoyu Tang edited comment on HIVE-16071 at 3/3/17 4:04 AM:
------------------------------------------------------------
For the error I mentioned in this JIRA description, it was caused by the
[timeout|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L176]
set in HS2 registerClient. It happened when SaslServerHandler and
SaslClientHandler were undergoing handshaking. The timeout caused the
registerClient in SparkClientImpl to throw out an error which interrupted the
process calling spark-submit, therefore ending the channel between HS2 and
RemoteClient. The channel termination was detected by
SaslClientHandler.channelInactive at RemoteDriver side, which in term invoked
SaslClientHandler.dispose(). Therefore we saw the SASLException with msg
"SaslException: Client closed before SASL negotiation finished."I have managed
to reproduce this error by adjusting the
hive.spark.client.server.connect.timeout value to make the HS2 timeout happen
during SASL negotiation but RemoteDriver has not reached its own timeout.
Looking more into the code, I think that the
[cancelTask|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L100]
is not used at all in the code. It never has a chance to effect because it has
the same timeout value as that used for
[registerClient|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L170],
and the latter one always kicks in before it.
Timeout at RemoteDriver side could happen at two places. If it happens when
driver
[connects|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/Rpc.java#L110]
back to HS2, HS2 could not detect this timeout error at driver site and has to
wait until its own timeout set in
[registerClient|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L170]
effects. If the
[timeout|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/Rpc.java#L122]
happens during SASL handshaking, the RemoteDriver main will exit abnormally.
The SaslServerHandler.channelInactive at HS2 side could detect this channel
termination and invokes the SaslServerHandler.dispose, which in term cancels
this cancelTask (not be used again). Depending on the stage where HS2 is at
(see following code snippet)
{code}
protected void onError(Throwable error) {
cancelTask.cancel(true);
if (client != null) {
client.timeoutFuture.cancel(true);
if (!client.promise.isDone()) {
client.promise.setFailure(error);
}
}
}
{code}
HS2 should either wait until its hive.spark.client.server.connect.timeout when
clientInfo is null, or terminates the process immediately.
So the
[cancelTask|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L100]
is currently useless in the code unless its timeout could be set with a
different (shorter) value than that set for registerClient
(hive.spark.client.server.connect.timeout). Or we can consider removing it
though its existence in current code does not do any harm either.
was (Author: ctang.ma):
For the error I mentioned in this JIRA description, it was caused by the
[timeout|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L176]
set in HS2 registerClient. It happened when SaslServerHandler and
SaslClientHandler were undergoing handshaking. The registerClient in
SparkClientImpl threw out an error which interrupted the process calling
spark-submit, therefore ending the channel between HS2 and RemoteClient. The
channel termination was detected by SaslClientHandler.channelInactive at
RemoteDriver, which in term invoked SaslClientHandler.dispose(), therefore we
saw the SASLException at RemoteDriver side with msg "SaslException: Client
closed before SASL negotiation finished." I have managed to reproduce this
error by adjusting the hive.spark.client.server.connect.timeout value to make
the HS2 timeout happen during SASL negotiation but RemoteDriver has not reached
its own timeout.
Looking more into the code, I think that the
[cancelTask|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L100]
never has a chance to effect. It has the same timeout value as that used for
[registerClient|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L170],
and the latter one always kicks in before it.
Timeout at RemoteDriver side could happen at two places. If it happens when
driver
[connects|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/Rpc.java#L110]
back to HS2, HS2 could not detect this timeout error and has to wait until its
own timeout set in
[registerClient|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L170]
effects. If the
[timeout|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/Rpc.java#L122]
happens during SASL handshaking, the RemoteDriver main will exit abnormally.
The SaslServerHandler.channelInactive at HS2 side could detect this channel
termination and invokes the SaslServerHandler.dispose, which in term cancels
this cancelTask. Depending on the stage where HS2 is at (see following code
snippet)
{code}
protected void onError(Throwable error) {
cancelTask.cancel(true);
if (client != null) {
client.timeoutFuture.cancel(true);
if (!client.promise.isDone()) {
client.promise.setFailure(error);
}
}
}
{code}
HS2 has to wait until its hive.spark.client.server.connect.timeout if the
clientInfo is null, or the process could terminate immediately.
So the
[cancelTask|https://github.com/apache/hive/blob/master/spark-client/src/main/java/org/apache/hive/spark/client/rpc/RpcServer.java#L100]
is not used in the code unless its timeout is set with a different value
shorter than that set for registerClient
(hive.spark.client.server.connect.timeout).
> Spark remote driver misuses the timeout in RPC handshake
> --------------------------------------------------------
>
> Key: HIVE-16071
> URL: https://issues.apache.org/jira/browse/HIVE-16071
> Project: Hive
> Issue Type: Bug
> Components: Spark
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
> Attachments: HIVE-16071.patch
>
>
> Based on its property description in HiveConf and the comments in HIVE-12650
> (https://issues.apache.org/jira/browse/HIVE-12650?focusedCommentId=15128979&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15128979),
> hive.spark.client.connect.timeout is the timeout when the spark remote
> driver makes a socket connection (channel) to RPC server. But currently it is
> also used by the remote driver for RPC client/server handshaking, which is
> not right. Instead, hive.spark.client.server.connect.timeout should be used
> and it has already been used by the RPCServer in the handshaking.
> The error like following is usually caused by this issue, since the default
> hive.spark.client.connect.timeout value (1000ms) used by remote driver for
> handshaking is a little too short.
> {code}
> 17/02/20 08:46:08 ERROR yarn.ApplicationMaster: User class threw exception:
> java.util.concurrent.ExecutionException: javax.security.sasl.SaslException:
> Client closed before SASL negotiation finished.
> java.util.concurrent.ExecutionException: javax.security.sasl.SaslException:
> Client closed before SASL negotiation finished.
> at io.netty.util.concurrent.AbstractFuture.get(AbstractFuture.java:37)
> at
> org.apache.hive.spark.client.RemoteDriver.<init>(RemoteDriver.java:156)
> at
> org.apache.hive.spark.client.RemoteDriver.main(RemoteDriver.java:556)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:542)
> Caused by: javax.security.sasl.SaslException: Client closed before SASL
> negotiation finished.
> at
> org.apache.hive.spark.client.rpc.Rpc$SaslClientHandler.dispose(Rpc.java:453)
> at
> org.apache.hive.spark.client.rpc.SaslHandler.channelInactive(SaslHandler.java:90)
> {code}
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