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https://issues.apache.org/jira/browse/SPARK-33182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Hyukjin Kwon resolved SPARK-33182.
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Resolution: Incomplete
> Using Delegation Tokens to access HBase through Spark (Java)
> ------------------------------------------------------------
>
> Key: SPARK-33182
> URL: https://issues.apache.org/jira/browse/SPARK-33182
> Project: Spark
> Issue Type: Question
> Components: Spark Core
> Affects Versions: 2.3.0
> Environment: Spark 2.3, RHEL 7.5, HDP 3
> Reporter: Rishi S Balajis
> Priority: Major
> Labels: hbase, kerberos
>
> I have a requirement to access a kerberized HBase through delegation tokens
> instead of keytab. I have generated the token using the token util API and
> also loaded it back into the UserGroupInformation. However,
> hasKerberosCredentials returns a false. I am looking for the the right way
> to use a saved delegation token to access HBase . The code that I have
> currently looks like shown below. I see the error :
> {code:java}
> client.RpcRetryingCallerImpl: Call exception, tries=6, retries=36,
> started=4850 ms ago, cancelled=false, msg=Connection closed, details=row
> 'employee,,' on table 'hbase:meta' at region=hbase:meta,,1.1588230740,
> hostname=myhost.com,16020,1602758016346, seqNum=-1{code}
>
> {code:java}
> UserGroupInformation ugi;
> ugi = UserGroupInformation.getLoginUser();
> Credentials creds = new Credentials ();
> creds = Credentials.readTokenStorageFile (new
> Path("file:///zen-volume-home/tokenFile"),conf);
>
> System.out.println("TOKEN *********" + creds.getToken(new
> org.apache.hadoop.io.Text("hbase")));
> ugi.addToken(creds.getToken(new org.apache.hadoop.io.Text("hbase")));
> ugi.addCredentials(creds);
> /* I do see the token getting printed. However, I am looking for information
> on how to use this ugi which has the token added to it, to access data on
> HBase.
> I have tried doing this : */
> SQLContext sqlC = ugi.getLoginUser().doAs((new
> PrivilegedExceptionAction<SQLContext>() {
> public SQLContext run() throws Exception {
>
> sparkconf = new SparkConf().setAppName("Hbase With Spark");
> jsc = new JavaSparkContext(sparkconf);
> hbaseContext = new JavaHBaseContext(jsc, conf);
> sqlContext = new org.apache.spark.sql.SQLContext(jsc);
>
> String sqlMapping = "name STRING all:name" ;
> Dataset<Row> dfEmp =
> sqlContext.read().format("org.apache.hadoop.hbase.spark")
>
> .option("hbase.columns.mapping", sqlMapping)
> .option("hbase.table", "employee").load();
>
> dfEmp.registerTempTable("empdata");
> dfEmp.show();
> return sqlContext;
> }
> }));
> {code}
>
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