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Object operations

Contributors netapp-lhalbert
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The following Swift API operations are performed on objects. These operations can be tracked in the StorageGRID audit log.

DELETE object

This operation deletes an object's content and metadata from the StorageGRID system.

The following request parameters are required:

  • Account

  • Container

  • Object

The following request header is required:

  • X-Auth-Token

A successful execution returns the following response headers with an HTTP/1.1 204 No Content response:

  • Content-Length

  • Content-Type

  • Date

  • X-Trans-Id

When processing a DELETE Object request, StorageGRID attempts to immediately remove all copies of the object from all stored locations. If successful, StorageGRID returns a response to the client immediately. If all copies can't be removed within 30 seconds (for example, because a location is temporarily unavailable), StorageGRID queues the copies for removal and then indicates success to the client.

For more information, see How objects are deleted.

GET object

This operation retrieves the object content and gets the object metadata from a StorageGRID system.

The following request parameters are required:

  • Account

  • Container

  • Object

The following request header is required:

  • X-Auth-Token

The following request headers are optional:

  • Accept-Encoding

  • If-Match

  • If-Modified-Since

  • If-None-Match

  • If-Unmodified-Since

  • Range

A successful execution returns the following headers with an HTTP/1.1 200 OK response:

  • Accept-Ranges

  • Content-Disposition, returned only if Content-Disposition metadata was set

  • Content-Encoding, returned only if Content-Encoding metadata was set

  • Content-Length

  • Content-Type

  • Date

  • ETag

  • Last-Modified

  • X-Timestamp

  • X-Trans-Id

HEAD object

This operation retrieves metadata and properties of an ingested object from a StorageGRID system.

The following request parameters are required:

  • Account

  • Container

  • Object

The following request header is required:

  • X-Auth-Token

A successful execution returns the following headers with an "HTTP/1.1 200 OK" response:

  • Accept-Ranges

  • Content-Disposition, returned only if Content-Disposition metadata was set

  • Content-Encoding, returned only if Content-Encoding metadata was set

  • Content-Length

  • Content-Type

  • Date

  • ETag

  • Last-Modified

  • X-Timestamp

  • X-Trans-Id

PUT object

This operation creates a new object with data and metadata, or replaces an existing object with data and metadata in a StorageGRID system.

StorageGRID supports objects up to 5 TiB (5,497,558,138,880 bytes) in size.

Note Conflicting client requests, such as two clients writing to the same key, are resolved on a "latest-wins" basis. The timing for the "latest-wins" evaluation is based on when the StorageGRID system completes a given request, and not on when Swift clients begin an operation.

The following request parameters are required:

  • Account

  • Container

  • Object

The following request header is required:

  • X-Auth-Token

The following request headers are optional:

  • Content-Disposition

  • Content-Encoding

    Don't use chunked Content-Encoding if the ILM rule that applies to an object filters objects based on size and uses synchronous placement on ingest (the Balanced or Strict options for Ingest Behavior).

  • Transfer-Encoding

    Don't use compressed or chunked Transfer-Encoding if the ILM rule that applies to an object filters objects based on size and uses synchronous placement on ingest (the Balanced or Strict options for Ingest Behavior).

  • Content-Length

    If an ILM rule filters objects by size and uses synchronous placement on ingest, you must specify Content-Length.

    Note If you don't follow these guidelines for Content-Encoding, Transfer-Encoding, and Content-Length, StorageGRID must save the object before it can determine object size and apply the ILM rule. In other words, StorageGRID must default to creating interim copies of an object on ingest. That is, StorageGRID must use the Dual Commit option for Ingest Behavior.

    For more information about synchronous placement and ILM rules, see Data-protection options for ingest.

  • Content-Type

  • ETag

  • X-Object-Meta-<name\> (object-related metadata)

    If you want to use the User defined creation time option as the Reference time for an ILM rule, you must store the value in a user-defined header named X-Object-Meta-Creation-Time. For example:

    X-Object-Meta-Creation-Time: 1443399726

    This field is evaluated as seconds since January 1, 1970.

  • X-Storage-Class: reduced_redundancy

    This header affects how many object copies StorageGRID creates if the ILM rule that matches an ingested object specifies an Ingest Behavior of Dual Commit or Balanced.

    • Dual commit: If the ILM rule specifies the Dual commit option for Ingest Behavior, StorageGRID creates a single interim copy as the object is ingested (single commit).

    • Balanced: If the ILM rule specifies the Balanced option, StorageGRID makes a single interim copy only if the system can't immediately make all copies specified in the rule. If StorageGRID can perform synchronous placement, this header has no effect.

      The reduced_redundancy header is best used when the ILM rule that matches the object creates a single replicated copy. In this case using reduced_redundancy eliminates the unnecessary creation and deletion of an extra object copy for every ingest operation.

      Using the reduced_redundancy header is not recommended in other circumstances because it increases the risk the loss of object data during ingest. For example, you might lose data if the single copy is initially stored on a Storage Node that fails before ILM evaluation can occur.

      Caution Having only one replicated copy for any time period puts data at risk of permanent loss. If only one replicated copy of an object exists, that object is lost if a Storage Node fails or has a significant error. You also temporarily lose access to the object during maintenance procedures such as upgrades.

    Note that specifying reduced_redundancy only affects how many copies are created when an object is first ingested. It does not affect how many copies of the object are made when the object is evaluated by the active ILM policies and does not result in data being stored at lower levels of redundancy in the StorageGRID system.

A successful execution returns the following headers with an "HTTP/1.1 201 Created" response:

  • Content-Length

  • Content-Type

  • Date

  • ETag

  • Last-Modified

  • X-Trans-Id