Girish Ganesan created YARN-10940:
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Summary: Fix Documentation for AWS-Hadoop integration /
yarn-site.xml
Key: YARN-10940
URL: https://issues.apache.org/jira/browse/YARN-10940
Project: Hadoop YARN
Issue Type: Task
Reporter: Girish Ganesan
The following document on AWS-Hadoop integration specified authenticating via
AWS environment variables:
[https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/index.html#Authenticating_via_the_AWS_Environment_Variables]
It provides a warning:
_Important: These environment variables are generally not propagated from
client to server when YARN applications are launched. That is: having the AWS
environment variables set when an application is launched will not permit the
launched application to access S3 resources. The environment variables must
(somehow) be set on the hosts/processes where the work is executed._
This is somewhat cryptic. A few things need to be clarified in the doc:
# This is true even when Yarn is running on a single node (pseudo distributed).
# *This also affects authentication via named profile*
credentials:[https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/index.html#Using_Named_Profile_Credentials_with_ProfileCredentialsProvider]
__ This method depends on AWS_PROFILE variable.
# Please give some pointers on how the variables can be propagated. One way is
to whitelist the variable in yarn.nodemanager.env-whitelist (set in
yarn-site.xml):
[https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/ClusterSetup.html#Configuring_Environment_of_Hadoop_Daemons]
I was trying to figure out why hive was failing on a query (using mapred) on an
external table created from S3. After a while I realized it was not getting the
AWS_PROFILE variable. Eventually I realized that adding the variable to the
Yarn whitelist will do the trick. Hopefully this ticket will help someone else.
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