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April 24, 2016 22:38
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How many capacity units does a dynamodb scan use
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def scanSizeTest(client: AmazonDynamoDBClient, tableName: String) = { | |
val recordCount = 100 | |
var recordSize = 10 | |
populateTable(client, tableName, recordCount, recordSize) | |
print(s"For batchGet of $recordCount count of $recordSize byte records (${recordCount * recordSize} bytes), used ${batchGetTable(client, tableName, recordCount)} units\n") | |
print(s"For scan of $recordCount count of $recordSize byte records (${recordCount * recordSize} bytes), used ${scanTable(client, tableName)} units\n") | |
recordSize = 100 | |
populateTable(client, tableName, recordCount, recordSize) | |
print(s"For scan of $recordCount count of $recordSize byte records (${recordCount * recordSize} bytes), used ${scanTable(client, tableName)} units\n") | |
recordSize = 1000 | |
populateTable(client, tableName, recordCount, recordSize) | |
print(s"For scan of $recordCount count of $recordSize byte records (${recordCount * recordSize} bytes), used ${scanTable(client, tableName)} units\n") | |
} | |
def batchGetTable(client: AmazonDynamoDBClient, tableName: String, recordCount: Int) = { | |
// Eventually consistent reads; make sure everything is in place | |
Thread.sleep(10000) | |
val keys = (0 until recordCount).map { i => Map("k" -> new AttributeValue().withS(i.toString)).asJava }.asJavaCollection | |
val ka = new KeysAndAttributes().withKeys(keys) | |
val res = client.batchGetItem(new BatchGetItemRequest() | |
.withRequestItems(Map(tableName -> ka)) | |
.withReturnConsumedCapacity(ReturnConsumedCapacity.TOTAL)) | |
res.getConsumedCapacity | |
} | |
def scanTable(client: AmazonDynamoDBClient, tableName: String) = { | |
// Scans are eventually consistent; make sure everything is in place | |
Thread.sleep(10000) | |
val res = client.scan(new ScanRequest() | |
.withTableName(tableName) | |
.withReturnConsumedCapacity(ReturnConsumedCapacity.TOTAL)) | |
res.getConsumedCapacity.getCapacityUnits | |
} | |
def populateTable(client:AmazonDynamoDBClient, tableName: String, recordCount: Int, dataSize: Int) = { | |
val fakeData = new Array[Byte](dataSize) | |
for (i <- 0 until recordCount) { | |
val res = client.putItem(new PutItemRequest() | |
.withTableName(tableName) | |
.withReturnConsumedCapacity(ReturnConsumedCapacity.TOTAL) | |
.withItem(Map("k" -> new AttributeValue().withS(i.toString), | |
"v" -> new AttributeValue().withB(ByteBuffer.wrap(fakeData))))) | |
} | |
print("Finished populating\n") | |
} |
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