Create DynamoDB table with Global Secondary Index - php

Question

I'm new to AWS DynamoDB and to nosql in general, and I'm having problem with table creation.
I'm trying to create a table named User with the following Attributes:
UserId (HASH)
OSType (RANGE)
MSISDN
IMSI
DeviceID
I need to query the table not only by UserId, but also by the following fields:
MSISDN
IMSI
DeviceID
My Logic is as follows:
Query the table by the UserId field.
If the query returned no results create a new one, but check that there isn't other users with the same MSISDN filed OR the same IMSI field OR the same DeviceID field.
After reading the manual about LSI/GSI i'm having difficulties understating how to create the table and define those indexes.
This is the code i'm tring to execute to creater the table using PHP+AWS SDK:
$client->createTable(array(
'TableName' => 'User',
'AttributeDefinitions' => array(
array('AttributeName' => 'UserId', 'AttributeType' => 'S'),
array('AttributeName' => 'OSType', 'AttributeType' => 'S'),
array('AttributeName' => 'MSISDN', 'AttributeType' => 'S'),
array('AttributeName' => 'IMSI', 'AttributeType' => 'S'),
array('AttributeName' => 'DeviceID', 'AttributeType' => 'S'),
),
'KeySchema' => array(
array('AttributeName' => 'UserId', 'KeyType' => 'HASH'),
array('AttributeName' => 'OSType', 'KeyType' => 'RANGE')
),
'GlobalSecondaryIndexes' => array(
array(
'IndexName' => 'IMSIIndex',
'KeySchema' => array(
array('AttributeName' => 'IMSI', 'KeyType' => 'HASH')
),
'Projection' => array(
'ProjectionType' => 'KEYS_ONLY',
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 10,
'WriteCapacityUnits' => 10
)
),
array(
'IndexName' => 'MSISDNIndex',
'KeySchema' => array(
array('AttributeName' => 'MSISDN', 'KeyType' => 'HASH')
),
'Projection' => array(
'ProjectionType' => 'KEYS_ONLY',
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 10,
'WriteCapacityUnits' => 10
)
),
array(
'IndexName' => 'DeviceIDIndex',
'KeySchema' => array(
array('AttributeName' => 'DeviceID', 'KeyType' => 'HASH')
),
'Projection' => array(
'ProjectionType' => 'KEYS_ONLY',
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 10,
'WriteCapacityUnits' => 10
)
),
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 50,
'WriteCapacityUnits' => 50
)
));
I'm getting this error:
PHP Fatal error: Uncaught Aws\DynamoDb\Exception\ValidationException: AWS Error Code: ValidationException, Status Code: 400, AWS Request ID: 70LGIARTTQF90S8P0HVRUKSJ27VV4KQNSO5AEMVJF66Q9ASUAAJG, AWS Error Type: client, AWS Error Message: One or more parameter values were invalid: Number of attributes in KeySchema does not exactly match number of attributes defined in AttributeDefinitions, User-Agent: aws-sdk-php2/2.4.11 Guzzle/3.7.4 curl/7.29.0 PHP/5.4.14
Please help me understand what am I doing wrong. I want to create the table with GSI, but I just can't comprehend the essence of secondary index in DynamoDB :(

Answer 1

Only attributes that are included in local and global index should be defined in the AttributeDefinitions section.

Answer 2

This should work:
$client->createTable(array(
'TableName' => 'User',
'AttributeDefinitions' => array(
array('AttributeName' => 'UserId', 'AttributeType' => 'S'),
array('AttributeName' => 'OSType', 'AttributeType' => 'S')
),
'KeySchema' => array(
array('AttributeName' => 'UserId', 'KeyType' => 'HASH'),
array('AttributeName' => 'OSType', 'KeyType' => 'RANGE')
),
'GlobalSecondaryIndexes' => array(
array(
'IndexName' => 'IMSIIndex',
'KeySchema' => array(
array('AttributeName' => 'IMSI', 'KeyType' => 'HASH')
),
'Projection' => array(
'ProjectionType' => 'KEYS_ONLY',
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 10,
'WriteCapacityUnits' => 10
)
),
array(
'IndexName' => 'MSISDNIndex',
'KeySchema' => array(
array('AttributeName' => 'MSISDN', 'KeyType' => 'HASH')
),
'Projection' => array(
'ProjectionType' => 'KEYS_ONLY',
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 10,
'WriteCapacityUnits' => 10
)
),
array(
'IndexName' => 'DeviceIDIndex',
'KeySchema' => array(
array('AttributeName' => 'DeviceID', 'KeyType' => 'HASH')
),
'Projection' => array(
'ProjectionType' => 'KEYS_ONLY',
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 10,
'WriteCapacityUnits' => 10
)
),
),
'ProvisionedThroughput' => array(
'ReadCapacityUnits' => 50,
'WriteCapacityUnits' => 50
)));
Hope that helps