DomainMetadata in Java

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AttributeValueCount A number representing the count of all name/value pairs in the domain AttributeValueSizeBytes The total storage size of attribute values, in bytes Timestamp The time at which the metadata was computed, in Unix time
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In the case of a bad request, one of the following DomainMetadata-specific error responses comes back:
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NoSuchDomain Returned if the specified domain name does not exist at that endpoint MissingParameter Returned if the request did not include a DomainName
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The two current domain size limitations are 1 billion attributes and 10GB of storage You can see how close you are to the attribute limit by looking at the AttributeValueCount numberAdding up the three byte sizes in the metadata gives you the total user storage for the domainThis tells you how close you are to the 10GB limit Plotting those two metrics over time in a report can inform decisions about using additional domains Another benefit to this metadata is the billing transparency it affordsAWS bills you for the storage you use in terms of GB per monthTo arrive at the final storage number, the storage in each of your domains is sampled periodicallyThere are no assurances that the metadata is updated at the same frequency as the automated sampling However, it does enable you to monitor the size of your own data storage at the finer grain level of the individual domain The metadata is not the result of a fresh computation for each callThe data is calculated and then cachedYou can see how fresh the data is by looking at the Timestamp response valueTypically the metadata updates differently based on usage of the domain Domains with normal everyday usage seem to update once a day between midnight and 1:00 am Eastern time New domains and rarely used domains do not show that same pattern However, at various times, freshly computed metadata can come back from consecutive calls, so there are no hard and fast rulesTreat the domain metadata as if it were served from a day-old cache, even though it may sometimes be fresh Feel free to use it in a graph that plots storage over time or in a chart that shows how evenly your data is distributed across domains Just do not use it immediately after a call to PutAttributes or DeleteAttributes as a way to verify success In the same way, it is not suitable for use in an automated verification step of a unit test or a data import tool
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The metadata fetching code using Java looks like this:
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SimpleDB simpleDB = new SimpleDB(accessKeyID, secretAccessKey); try { Domain d = simpleDBgetDomain("users");
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DomainMetadataResult meta = dgetMetadata(); Systemoutprintf("'%s': %d items", dgetName(), metagetItemCount()); } catch (SDBException e) { AWSError error = egetErrors()get(0); String code = errorgetCode(); String message = errorgetMessage(); Systemerrprintf("domain metadata failed: %s: %s", code, message); }
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The Typica class that holds the resulting metadata is DomainMetadataResult, and it defines seven properties for access to the seven data values in the responseThis sample only accesses the ItemCount property
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The code implementing a domain metadata request in Amazon s C# library is as follows:
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AmazonSimpleDB simpleDB = new AmazonSimpleDBClient(id, secret); DomainMetadataRequest request = new DomainMetadataRequest(); String domain = "products"; try { requestDomainName = domain; DomainMetadataResponse resp = simpleDBDomainMetadata(request); DomainMetadataResult meta = respDomainMetadataResult; ConsoleWriteLine("'{0}': {1} items", domain, metaItemCount); } catch (AmazonSimpleDBException ex) { String code = exErrorCode; String message = exMessage; ConsoleWriteLine("failed: {0}: {1}", code, message); }
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The DomainMetadataResult embedded in the response allows access to all of the metadata properties Here, the sample code writes the DomainName and the ItemCount to the console
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In Tarzan for PHP, you pull the metadata for a domain like this:
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$sdb = new AmazonSDB(); $meta = $sdb->domain_metadata('products'); if ($meta->isOK()) { $meta_values = $meta->body->DomainMetadataResult;
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