Questions and answers

How do I transfer from HDFS to S3?

How do I transfer from HDFS to S3?

The below steps walk you through how to use a staging machine with AWS Snowball Edge to migrate HDFS files to Amazon S3: Prepare Staging Machine. Test Copy Performance. Copy Files to the Device….

  1. Step 1: Prepare staging machine.
  2. Step 2: Test copy performance.
  3. Step 3: Copy files to the device.
  4. Step 4: Validate file transfer.

How do I transfer data from one cluster to another cluster?

You can copy files or directories between different clusters by using the hadoop distcp command. You must include a credentials file in your copy request so the source cluster can validate that you are authenticated to the source cluster and the target cluster.

How do I transfer data from S3 to HDFS?


  1. Open the Amazon EMR console, and then choose Clusters.
  2. Choose the Amazon EMR cluster from the list, and then choose Steps.
  3. Choose Add step, and then choose the following options:
  4. Choose Add.
  5. When the step Status changes to Completed, verify that the files were copied to the cluster:

What is Distcp S3?

Apache DistCp is an open-source tool you can use to copy large amounts of data. You can also use S3DistCp to copy data between Amazon S3 buckets or from HDFS to Amazon S3. S3DistCp is more scalable and efficient for parallel copying large numbers of objects across buckets and across AWS accounts.

Can S3 use hive?

FINRA uses Amazon EMR to run Apache Hive on a S3 data lake. Data is stored in S3 and EMR builds a Hive metastore on top of that data. The Hive metastore contains all the metadata about the data and tables in the EMR cluster, which allows for easy data analysis.


Under the hood, the cloud provider automatically provisions resources on demand. Simply put, S3 is elastic, HDFS is not.

Is the best way to copy files between HDFS cluster?

How do I transfer data from one HDFS to another?


  1. copy one file to another. % hadoop distcp file1 file2.
  2. copy directories from one location to another. % hadoop distcp dir1 dir2.

What is the difference between S3 and s3a?

s3 is a block-based overlay on top of Amazon S3,whereas s3n/s3a are not. These are are object-based. s3n supports objects up to 5GB when size is the concern, while s3a supports objects up to 5TB and has higher performance. Note that s3a is the successor to s3n.

How do I access EMR hdfs?

To access a local HDFS Specify the hdfs:/// prefix in the URI. Amazon EMR resolves paths that do not specify a prefix in the URI to the local HDFS. For example, both of the following URIs would resolve to the same location in HDFS.

What is S3 batch operations?

S3 Batch Operations is a managed solution for performing storage actions like copying and tagging objects at scale, whether for one-time tasks or for recurring, batch workloads. S3 Batch Operations can perform actions across billions of objects and petabytes of data with a single request.

How do I transfer data from one S3 bucket to another?

To copy objects from one S3 bucket to another, follow these steps:

  1. Create a new S3 bucket.
  2. Install and configure the AWS Command Line Interface (AWS CLI).
  3. Copy the objects between the S3 buckets.
  4. Verify that the objects are copied.
  5. Update existing API calls to the target bucket name.