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https://issues.apache.org/jira/browse/HADOOP-17771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Steve Loughran updated HADOOP-17771:
------------------------------------
Description:
If you don't have {{fs.s3a.endpoint}} set and lack a region set in
env var {{AWS_REGION_ENV_VAR}}, system property {{aws.region}} or the file
~/.aws/config
then S3A FS creation fails with the message
"Unable to find a region via the region provider chain."
This is caused by the move to the AWS S3 client builder API in HADOOP-13551
This is pretty dramatic and no doubt everyone will be asking "why didn't you
notice this?",
But in fact there are some reasons.
# when running in EC2, all is well. Meaning our big test runs were all happy.
# if a developer has fs.s3a.endpoint set for the test bucket, all is well.
Those of us who work with buckets in the "regions tend to do this, not least
because it can save a HEAD request every time an FS is created.
# if you have a region set in ~/.aws/config then all is well
reason #3 is the real surprise and the one which has really caught out. Even my
tests against buckets in usw-2 through central didn't fail because of course I,
like my colleagues, have the AWS S3 client installed locally. This was
sufficient to make the problem go away. It is also why this has been an
intermittent problem on test clusters outside AWS infra: it really depended on
the VM/docker image whether things worked or not.
h2. Quick Fix: set {{fs.s3a.endpoint}} to {{s3.amazonaws.com}}
If you have found this JIRA because you are encountering this problem, you can
fix it in by explicitly declaring the endpoint in {{core-site.xml}}
{code}
<property>
<name>fs.s3a.endpoint</name>
<value>s3.amazonaws.com</value>
</property>
{code}
For Apache Spark, this can be done in {{spark-defaults.conf}}
{code}
spark.hadoop.fs.s3a.endpoint s3.amazonaws.com
{code}
If you know the exact AWS region your data lives in, set the endpoint to be
that region's endpoint, and so save an HTTPS request to s3.amazonaws.com every
time an S3A Filesystem instance is created.
was:
If you don't have {{fs.s3a.endpoint}} set and lack a region set in
env var {{AWS_REGION_ENV_VAR}}, system property {{aws.region}} or the file
~/.aws/config
then S3A FS creation fails with the message
"Unable to find a region via the region provider chain."
This is caused by the move to the AWS S3 client builder API in HADOOP-13551
This is pretty dramatic and no doubt everyone will be asking "why didn't you
notice this?",
But in fact there are some reasons.
# when running in EC2, all is well. Meaning our big test runs were all happy.
# if a developer has fs.s3a.endpoint set for the test bucket, all is well.
Those of us who work with buckets in the "regions tend to do this, not least
because it can save a HEAD request every time an FS is created.
# if you have a region set in ~/.aws/config then all is well
reason #3 is the real surprise and the one which has really caught out. Even my
tests against buckets in usw-2 through central didn't fail because of course I,
like my colleagues, have the AWS S3 client installed locally. This was
sufficient to make the problem go away. It is also why this has been an
intermittent problem on test clusters outside AWS infra: it really depended on
the VM/docker image whether things worked or not.
> S3AFS creation fails "Unable to find a region via the region provider chain."
> -----------------------------------------------------------------------------
>
> Key: HADOOP-17771
> URL: https://issues.apache.org/jira/browse/HADOOP-17771
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.3.1
> Environment: * fs.s3a.endpoint is unset
> * Host outside EC2
> * without the file ~/.aws/config or without a region set in it
> * without the system property aws.region declaring a region
> * without the environment variable AWS_REGION declaring a region.
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Blocker
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> If you don't have {{fs.s3a.endpoint}} set and lack a region set in
> env var {{AWS_REGION_ENV_VAR}}, system property {{aws.region}} or the file
> ~/.aws/config
> then S3A FS creation fails with the message
> "Unable to find a region via the region provider chain."
> This is caused by the move to the AWS S3 client builder API in HADOOP-13551
> This is pretty dramatic and no doubt everyone will be asking "why didn't you
> notice this?",
> But in fact there are some reasons.
> # when running in EC2, all is well. Meaning our big test runs were all happy.
> # if a developer has fs.s3a.endpoint set for the test bucket, all is well.
> Those of us who work with buckets in the "regions tend to do this, not
> least because it can save a HEAD request every time an FS is created.
> # if you have a region set in ~/.aws/config then all is well
> reason #3 is the real surprise and the one which has really caught out. Even
> my tests against buckets in usw-2 through central didn't fail because of
> course I, like my colleagues, have the AWS S3 client installed locally. This
> was sufficient to make the problem go away. It is also why this has been an
> intermittent problem on test clusters outside AWS infra: it really depended
> on the VM/docker image whether things worked or not.
> h2. Quick Fix: set {{fs.s3a.endpoint}} to {{s3.amazonaws.com}}
> If you have found this JIRA because you are encountering this problem, you
> can fix it in by explicitly declaring the endpoint in {{core-site.xml}}
> {code}
> <property>
> <name>fs.s3a.endpoint</name>
> <value>s3.amazonaws.com</value>
> </property>
> {code}
> For Apache Spark, this can be done in {{spark-defaults.conf}}
> {code}
> spark.hadoop.fs.s3a.endpoint s3.amazonaws.com
> {code}
> If you know the exact AWS region your data lives in, set the endpoint to be
> that region's endpoint, and so save an HTTPS request to s3.amazonaws.com
> every time an S3A Filesystem instance is created.
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