Kei Kori created SPARK-26125:
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Summary: Delegation Token seems not appropriately stored on secrets of Kubernetes/Kerberized
HDFS
Key: SPARK-26125
URL: https://issues.apache.org/jira/browse/SPARK-26125
Project: Spark
Issue Type: Bug
Components: Kubernetes
Affects Versions: 3.0.0
Reporter: Kei Kori
Attachments: spark-submit-stern.log
I tried Kerberos authentication with Kubernetes Resource Manager and an external Hadoop and
KDC.
I tested built on [6c9c84f|https://github.com/apache/spark/commit/6c9c84ffb9c8d98ee2ece7ba4b010856591d383d]
(master + SPARK-23257).
{code}
$ bin/spark-submit \
--deploy-mode cluster \
--class org.apache.spark.examples.HdfsTest \
--master k8s://https://master01.node:6443 \
--conf spark.kubernetes.authenticate.driver.serviceAccountName=spark \
--conf spark.app.name=spark-hdfs \
--conf spark.executer.instances=1 \
--conf spark.kubernetes.container.image=docker-registry/kkori/spark:6c9c84f \
--conf spark.kubernetes.kerberos.enabled=true \
--conf spark.kubernetes.kerberos.krb5.configMapName=krb5-conf \
--conf spark.kubernetes.kerberos.keytab=/tmp/test.keytab \
--conf spark.kubernetes.kerberos.principal=test@EXTERNAL.KERBEROS.REALM.COM \
--conf spark.kubernetes.hadoop.configMapName=hadoop-conf \
local:///opt/spark/examples/jars/spark-examples_2.11-3.0.0-SNAPSHOT.jar
{code}
I successfully submitted into Kubernetes RM and Kubernetes spawned spark-driver and executors,
but Hadoop Delegation Token seems wrongly stored into Kubernetes secrets, since that contains
only header like below:
{code}
$ kubectl get secrets spark-hdfs-1542613661459-delegation-tokens -o jsonpath='{.data.hadoop-tokens}'
| {base64 -d | cat -A; echo;}
HDTS^@^@^@
{code}
The result of "kubectl get secrets" should be like folloing(I masked the actual result):
{code}
HDTS^@^ha-hdfs:test^@^_test@EXTERNAL.KERBEROS.REALM.COM^@^XXXX@
{code}
As a result, spark-driver threw GSSException for each access of HDFS.
Full logs(submit, driver, executor) are attached.
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