amazonka-dynamodb-1.6.1: Amazon DynamoDB SDK.

Copyright(c) 2013-2018 Brendan Hay
LicenseMozilla Public License, v. 2.0.
MaintainerBrendan Hay <brendan.g.hay+amazonka@gmail.com>
Stabilityauto-generated
Portabilitynon-portable (GHC extensions)
Safe HaskellNone
LanguageHaskell2010

Network.AWS.DynamoDB.BatchWriteItem

Contents

Description

The BatchWriteItem operation puts or deletes multiple items in one or more tables. A single call to BatchWriteItem can write up to 16 MB of data, which can comprise as many as 25 put or delete requests. Individual items to be written can be as large as 400 KB.

The individual PutItem and DeleteItem operations specified in BatchWriteItem are atomic; however BatchWriteItem as a whole is not. If any requested operations fail because the table's provisioned throughput is exceeded or an internal processing failure occurs, the failed operations are returned in the UnprocessedItems response parameter. You can investigate and optionally resend the requests. Typically, you would call BatchWriteItem in a loop. Each iteration would check for unprocessed items and submit a new BatchWriteItem request with those unprocessed items until all items have been processed.

Note that if none of the items can be processed due to insufficient provisioned throughput on all of the tables in the request, then BatchWriteItem will return a ProvisionedThroughputExceededException .

Important: If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm . If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables. If you delay the batch operation using exponential backoff, the individual requests in the batch are much more likely to succeed.

For more information, see Batch Operations and Error Handling in the Amazon DynamoDB Developer Guide .

With BatchWriteItem , you can efficiently write or delete large amounts of data, such as from Amazon Elastic MapReduce (EMR), or copy data from another database into DynamoDB. In order to improve performance with these large-scale operations, BatchWriteItem does not behave in the same way as individual PutItem and DeleteItem calls would. For example, you cannot specify conditions on individual put and delete requests, and BatchWriteItem does not return deleted items in the response.

If you use a programming language that supports concurrency, you can use threads to write items in parallel. Your application must include the necessary logic to manage the threads. With languages that don't support threading, you must update or delete the specified items one at a time. In both situations, BatchWriteItem performs the specified put and delete operations in parallel, giving you the power of the thread pool approach without having to introduce complexity into your application.

Parallel processing reduces latency, but each specified put and delete request consumes the same number of write capacity units whether it is processed in parallel or not. Delete operations on nonexistent items consume one write capacity unit.

If one or more of the following is true, DynamoDB rejects the entire batch write operation:

  • One or more tables specified in the BatchWriteItem request does not exist.
  • Primary key attributes specified on an item in the request do not match those in the corresponding table's primary key schema.
  • You try to perform multiple operations on the same item in the same BatchWriteItem request. For example, you cannot put and delete the same item in the same BatchWriteItem request.
  • Your request contains at least two items with identical hash and range keys (which essentially is two put operations).
  • There are more than 25 requests in the batch.
  • Any individual item in a batch exceeds 400 KB.
  • The total request size exceeds 16 MB.
Synopsis

Creating a Request

batchWriteItem :: BatchWriteItem Source #

Creates a value of BatchWriteItem with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

  • bwiReturnConsumedCapacity - Undocumented member.
  • bwiReturnItemCollectionMetrics - Determines whether item collection metrics are returned. If set to SIZE , the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
  • bwiRequestItems - A map of one or more table names and, for each table, a list of operations to be performed (DeleteRequest or PutRequest ). Each element in the map consists of the following: * DeleteRequest - Perform a DeleteItem operation on the specified item. The item to be deleted is identified by a Key subelement: * Key - A map of primary key attribute values that uniquely identify the item. Each entry in this map consists of an attribute name and an attribute value. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key. * PutRequest - Perform a PutItem operation on the specified item. The item to be put is identified by an Item subelement: * Item - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a ValidationException exception. If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.

data BatchWriteItem Source #

Represents the input of a BatchWriteItem operation.

See: batchWriteItem smart constructor.

Instances
Eq BatchWriteItem Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Data BatchWriteItem Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> BatchWriteItem -> c BatchWriteItem #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c BatchWriteItem #

toConstr :: BatchWriteItem -> Constr #

dataTypeOf :: BatchWriteItem -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c BatchWriteItem) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c BatchWriteItem) #

gmapT :: (forall b. Data b => b -> b) -> BatchWriteItem -> BatchWriteItem #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> BatchWriteItem -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> BatchWriteItem -> r #

gmapQ :: (forall d. Data d => d -> u) -> BatchWriteItem -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> BatchWriteItem -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> BatchWriteItem -> m BatchWriteItem #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> BatchWriteItem -> m BatchWriteItem #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> BatchWriteItem -> m BatchWriteItem #

Read BatchWriteItem Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Show BatchWriteItem Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

Generic BatchWriteItem Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

Associated Types

type Rep BatchWriteItem :: Type -> Type #

Hashable BatchWriteItem Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

ToJSON BatchWriteItem Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

AWSRequest BatchWriteItem Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

Associated Types

type Rs BatchWriteItem :: Type #

ToHeaders BatchWriteItem Source # 
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ToPath BatchWriteItem Source # 
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ToQuery BatchWriteItem Source # 
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NFData BatchWriteItem Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

Methods

rnf :: BatchWriteItem -> () #

type Rep BatchWriteItem Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

type Rep BatchWriteItem = D1 (MetaData "BatchWriteItem" "Network.AWS.DynamoDB.BatchWriteItem" "amazonka-dynamodb-1.6.1-FTtIhwsA5vX17zvPeEA8Mr" False) (C1 (MetaCons "BatchWriteItem'" PrefixI True) (S1 (MetaSel (Just "_bwiReturnConsumedCapacity") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ReturnConsumedCapacity)) :*: (S1 (MetaSel (Just "_bwiReturnItemCollectionMetrics") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe ReturnItemCollectionMetrics)) :*: S1 (MetaSel (Just "_bwiRequestItems") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Map Text (List1 WriteRequest))))))
type Rs BatchWriteItem Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Request Lenses

bwiReturnItemCollectionMetrics :: Lens' BatchWriteItem (Maybe ReturnItemCollectionMetrics) Source #

Determines whether item collection metrics are returned. If set to SIZE , the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.

bwiRequestItems :: Lens' BatchWriteItem (HashMap Text (NonEmpty WriteRequest)) Source #

A map of one or more table names and, for each table, a list of operations to be performed (DeleteRequest or PutRequest ). Each element in the map consists of the following: * DeleteRequest - Perform a DeleteItem operation on the specified item. The item to be deleted is identified by a Key subelement: * Key - A map of primary key attribute values that uniquely identify the item. Each entry in this map consists of an attribute name and an attribute value. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key. * PutRequest - Perform a PutItem operation on the specified item. The item to be put is identified by an Item subelement: * Item - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a ValidationException exception. If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.

Destructuring the Response

batchWriteItemResponse Source #

Creates a value of BatchWriteItemResponse with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

  • bwirsItemCollectionMetrics - A list of tables that were processed by BatchWriteItem and, for each table, information about any item collections that were affected by individual DeleteItem or PutItem operations. Each entry consists of the following subelements: * ItemCollectionKey - The partition key value of the item collection. This is the same as the partition key value of the item. * SizeEstimateRangeGB - An estimate of item collection size, expressed in GB. This is a two-element array containing a lower bound and an upper bound for the estimate. The estimate includes the size of all the items in the table, plus the size of all attributes projected into all of the local secondary indexes on the table. Use this estimate to measure whether a local secondary index is approaching its size limit. The estimate is subject to change over time; therefore, do not rely on the precision or accuracy of the estimate.
  • bwirsConsumedCapacity - The capacity units consumed by the entire BatchWriteItem operation. Each element consists of: * TableName - The table that consumed the provisioned throughput. * CapacityUnits - The total number of capacity units consumed.
  • bwirsUnprocessedItems - A map of tables and requests against those tables that were not processed. The UnprocessedItems value is in the same form as RequestItems , so you can provide this value directly to a subsequent BatchGetItem operation. For more information, see RequestItems in the Request Parameters section. Each UnprocessedItems entry consists of a table name and, for that table, a list of operations to perform (DeleteRequest or PutRequest ). * DeleteRequest - Perform a DeleteItem operation on the specified item. The item to be deleted is identified by a Key subelement: * Key - A map of primary key attribute values that uniquely identify the item. Each entry in this map consists of an attribute name and an attribute value. * PutRequest - Perform a PutItem operation on the specified item. The item to be put is identified by an Item subelement: * Item - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a ValidationException exception. If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition. If there are no unprocessed items remaining, the response contains an empty UnprocessedItems map.
  • bwirsResponseStatus - -- | The response status code.

data BatchWriteItemResponse Source #

Represents the output of a BatchWriteItem operation.

See: batchWriteItemResponse smart constructor.

Instances
Eq BatchWriteItemResponse Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Data BatchWriteItemResponse Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> BatchWriteItemResponse -> c BatchWriteItemResponse #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c BatchWriteItemResponse #

toConstr :: BatchWriteItemResponse -> Constr #

dataTypeOf :: BatchWriteItemResponse -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c BatchWriteItemResponse) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c BatchWriteItemResponse) #

gmapT :: (forall b. Data b => b -> b) -> BatchWriteItemResponse -> BatchWriteItemResponse #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> BatchWriteItemResponse -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> BatchWriteItemResponse -> r #

gmapQ :: (forall d. Data d => d -> u) -> BatchWriteItemResponse -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> BatchWriteItemResponse -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> BatchWriteItemResponse -> m BatchWriteItemResponse #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> BatchWriteItemResponse -> m BatchWriteItemResponse #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> BatchWriteItemResponse -> m BatchWriteItemResponse #

Read BatchWriteItemResponse Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Show BatchWriteItemResponse Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

Generic BatchWriteItemResponse Source # 
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Defined in Network.AWS.DynamoDB.BatchWriteItem

Associated Types

type Rep BatchWriteItemResponse :: Type -> Type #

NFData BatchWriteItemResponse Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

Methods

rnf :: BatchWriteItemResponse -> () #

type Rep BatchWriteItemResponse Source # 
Instance details

Defined in Network.AWS.DynamoDB.BatchWriteItem

type Rep BatchWriteItemResponse = D1 (MetaData "BatchWriteItemResponse" "Network.AWS.DynamoDB.BatchWriteItem" "amazonka-dynamodb-1.6.1-FTtIhwsA5vX17zvPeEA8Mr" False) (C1 (MetaCons "BatchWriteItemResponse'" PrefixI True) ((S1 (MetaSel (Just "_bwirsItemCollectionMetrics") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe (Map Text [ItemCollectionMetrics]))) :*: S1 (MetaSel (Just "_bwirsConsumedCapacity") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe [ConsumedCapacity]))) :*: (S1 (MetaSel (Just "_bwirsUnprocessedItems") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe (Map Text (List1 WriteRequest)))) :*: S1 (MetaSel (Just "_bwirsResponseStatus") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Int))))

Response Lenses

bwirsItemCollectionMetrics :: Lens' BatchWriteItemResponse (HashMap Text [ItemCollectionMetrics]) Source #

A list of tables that were processed by BatchWriteItem and, for each table, information about any item collections that were affected by individual DeleteItem or PutItem operations. Each entry consists of the following subelements: * ItemCollectionKey - The partition key value of the item collection. This is the same as the partition key value of the item. * SizeEstimateRangeGB - An estimate of item collection size, expressed in GB. This is a two-element array containing a lower bound and an upper bound for the estimate. The estimate includes the size of all the items in the table, plus the size of all attributes projected into all of the local secondary indexes on the table. Use this estimate to measure whether a local secondary index is approaching its size limit. The estimate is subject to change over time; therefore, do not rely on the precision or accuracy of the estimate.

bwirsConsumedCapacity :: Lens' BatchWriteItemResponse [ConsumedCapacity] Source #

The capacity units consumed by the entire BatchWriteItem operation. Each element consists of: * TableName - The table that consumed the provisioned throughput. * CapacityUnits - The total number of capacity units consumed.

bwirsUnprocessedItems :: Lens' BatchWriteItemResponse (HashMap Text (NonEmpty WriteRequest)) Source #

A map of tables and requests against those tables that were not processed. The UnprocessedItems value is in the same form as RequestItems , so you can provide this value directly to a subsequent BatchGetItem operation. For more information, see RequestItems in the Request Parameters section. Each UnprocessedItems entry consists of a table name and, for that table, a list of operations to perform (DeleteRequest or PutRequest ). * DeleteRequest - Perform a DeleteItem operation on the specified item. The item to be deleted is identified by a Key subelement: * Key - A map of primary key attribute values that uniquely identify the item. Each entry in this map consists of an attribute name and an attribute value. * PutRequest - Perform a PutItem operation on the specified item. The item to be put is identified by an Item subelement: * Item - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a ValidationException exception. If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition. If there are no unprocessed items remaining, the response contains an empty UnprocessedItems map.