[FLINK-2977] Cannot access HBase in a Kerberos secured Yarn cluster

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.10.1, 1.0.0
• Component/s: Deployment / YARN
• Assignee: Niels Basjes
• Reporter: Niels Basjes
• Created: 05/Nov/15 12:36
• Updated: 19/Dec/16 12:47
• Resolved: 17/Nov/15 09:07

Description

I have created a very simple Flink topology consisting of a streaming Source (the outputs the timestamp a few times per second) and a Sink (that puts that timestamp into a single record in HBase).
Running this on a non-secure Yarn cluster works fine.

To run it on a secured Yarn cluster my main routine now looks like this:

public static void main(String[] args) throws Exception {
    System.setProperty("java.security.krb5.conf", "/etc/krb5.conf");
    UserGroupInformation.loginUserFromKeytab("[e-mail]", "/home/nbasjes/.krb/nbasjes.keytab");

    final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    env.setParallelism(1);

    DataStream<String> stream = env.addSource(new TimerTicksSource());
    stream.addSink(new SetHBaseRowSink());
    env.execute("Long running Flink application");
}

When I run this
flink run -m yarn-cluster -yn 1 -yjm 1024 -ytm 4096 ./kerberos-1.0-SNAPSHOT.jar

I see after the startup messages:

17:13:24,466 INFO org.apache.hadoop.security.UserGroupInformation - Login successful for user [e-mail] using keytab file /home/nbasjes/.krb/nbasjes.keytab
11/03/2015 17:13:25 Job execution switched to status RUNNING.
11/03/2015 17:13:25 Custom Source -> Stream Sink(1/1) switched to SCHEDULED
11/03/2015 17:13:25 Custom Source -> Stream Sink(1/1) switched to DEPLOYING
11/03/2015 17:13:25 Custom Source -> Stream Sink(1/1) switched to RUNNING

Which looks good.

However ... no data goes into HBase.
After some digging I found this error in the task managers log:

17:13:42,677 WARN org.apache.hadoop.hbase.ipc.RpcClient - Exception encountered while connecting to the server : javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]
17:13:42,677 FATAL org.apache.hadoop.hbase.ipc.RpcClient - SASL authentication failed. The most likely cause is missing or invalid credentials. Consider 'kinit'.
javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]
at com.sun.security.sasl.gsskerb.GssKrb5Client.evaluateChallenge(GssKrb5Client.java:212)
at org.apache.hadoop.hbase.security.HBaseSaslRpcClient.saslConnect(HBaseSaslRpcClient.java:177)
at org.apache.hadoop.hbase.ipc.RpcClient$Connection.setupSaslConnection(RpcClient.java:815)
at org.apache.hadoop.hbase.ipc.RpcClient$Connection.access$800(RpcClient.java:349)

First starting a yarn-session and then loading my job gives the same error.

My best guess at this point is that Flink needs the same fix as described here:

https://issues.apache.org/jira/browse/SPARK-6918 ( https://github.com/apache/spark/pull/5586 )