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Date: Fri, 13 Nov 2015 10:15:10 +0000 (UTC)
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Subject: [jira] [Commented] (FLINK-2977) Cannot access HBase in a Kerberos
 secured Yarn cluster
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    [ https://issues.apache.org/jira/browse/FLINK-2977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003813#comment-15003813 ] 

ASF GitHub Bot commented on FLINK-2977:
---------------------------------------

Github user mxm commented on the pull request:

    https://github.com/apache/flink/pull/1342#issuecomment-156387638
  
    +1 thanks for improving it!


> Cannot access HBase in a Kerberos secured Yarn cluster
> ------------------------------------------------------
>
>                 Key: FLINK-2977
>                 URL: https://issues.apache.org/jira/browse/FLINK-2977
>             Project: Flink
>          Issue Type: Bug
>          Components: YARN Client
>            Reporter: Niels Basjes
>            Assignee: Niels Basjes
>         Attachments: FLINK-2977-20151005-untested.patch, FLINK-2977-20151009.patch
>
>
> 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:
> {code}
> public static void main(String[] args) throws Exception {
>     System.setProperty("java.security.krb5.conf", "/etc/krb5.conf");
>     UserGroupInformation.loginUserFromKeytab("nbasjes@xxxxxx.NET", "/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");
> }
> {code}
> 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:
> {quote}
> 17:13:24,466 INFO  org.apache.hadoop.security.UserGroupInformation               - Login successful for user nbasjes@xxxxxx.NET 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 
> {quote}
> Which looks good.
> However ... no data goes into HBase.
> After some digging I found this error in the task managers log:
> {quote}
> 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)
> {quote}
> 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 )


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