Abstract: Systems, methods, and computer readable media for decentralized two-phase commit in a datastore or database where the methods include determining pre-validating a transaction, writing first metadata to a leader partition, the first metadata including a state indicating preparing and mutations of the transaction, and writing second metadata of a follower partition to indicate the follower partition is locked by the leader partition. The methods further include updating the state of the first metadata to indicate committed and performing the transaction on the leader partition, performing the transaction on the follower partition and unlocking the follower partition, and updating the first metadata to remove the mutations of the transaction and updating the state of the first metadata to indicate the transaction is completed. The methods may further include selecting a leader partition key and updating the state of the first metadata to indicate committed unapplied.

Abstract: A decentralized two-phase commit in a datastore or database includes determining pre-validating a transaction, writing first metadata to a leader partition, the first metadata including a state indicating preparing and mutations of the transaction, and writing second metadata of a follower partition to indicate the follower partition is locked by the leader partition. The decentralized two-phase commit further includes updating the state of the first metadata to indicate committed and performing the transaction on the leader partition, performing the transaction on the follower partition and unlocking the follower partition, and updating the first metadata to remove the mutations of the transaction and updating the state of the first metadata to indicate the transaction is completed. The decentralized two-phase commit may further include selecting a leader partition key and updating the state of the first metadata to indicate committed unapplied.

Abstract: Systems, methods, and computer readable media for decentralized two-phase commit in a datastore or database where the methods include determining pre-validating a transaction, writing first metadata to a leader partition, the first metadata including a state indicating preparing and mutations of the transaction, and writing second metadata of a follower partition to indicate the follower partition is locked by the leader partition. The methods further include updating the state of the first metadata to indicate committed and performing the transaction on the leader partition, performing the transaction on the follower partition and unlocking the follower partition, and updating the first metadata to remove the mutations of the transaction and updating the state of the first metadata to indicate the transaction is completed. The methods may further include selecting a leader partition key and updating the state of the first metadata to indicate committed unapplied.

Abstract: Content that is stored at a secondary location for a service is crawled before it is placed in operation to assist in maintaining an up to date search index. The content that is crawled at the secondary location includes content that is obtained from the primary location of the service. When a crawler at the secondary location attempts to access content that is stored at the primary location, the crawler is directed to access the corresponding copy of the content that is stored at the secondary location instead of accessing the content at the primary location. The content may be crawled at the secondary location at different times, such as when the information is updated, according to a schedule, and the like.