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    SNAPSHOT ISOLATION QUERY TRANSACTIONS IN DISTRIBUTED SYSTEMS
    3.
    发明申请
    SNAPSHOT ISOLATION QUERY TRANSACTIONS IN DISTRIBUTED SYSTEMS 有权

    公开(公告)号：US20220300484A1

    公开(公告)日：2022-09-22

    申请号：US17207282

    申请日：2021-03-19

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Sarvesh SINGH ,  Xianfei DENG ,  Hari Krishna SUNDER ,  Sandeep LINGAM ,  Srikumar RANGARAJAN

    IPC: G06F16/23 ,  G06F16/27 ,  G06F16/2455 ,  G06F16/215

    Abstract: Methods for snapshot isolation query transactions in distributed systems are performed by systems and devices. Distributed executions of queries are performed in a processing system according to an isolation level protocol for data management and data versioning across one or more data sets, one or more compute pools, etc., within a logical server via a single transaction manager that oversees the isolation semantics and data versioning. Read transactions of queries are performed lock-free via the isolation semantics, and instant rollbacks, point-in-time queries, single-phase commits in the distributed systems are also provided. Abort and clean up operations are performed based on a distributed abort protocol and a determined oldest active transaction for the system in which the single transaction manager does not track read-only transactions, and client nodes do not maintain commit tables for transactions.

    SNAPSHOT-BASED DATA CORRUPTION DETECTION
    5.
    发明申请
    SNAPSHOT-BASED DATA CORRUPTION DETECTION 有权

    公开(公告)号：US20220342778A1

    公开(公告)日：2022-10-27

    申请号：US17512337

    申请日：2021-10-27

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Alexander BUDOVSKI ,  Cristian DIACONU ,  Sandeep LINGAM ,  Alejandro Hernandez SAENZ ,  Naveen PRAKASH ,  Krystyna Ewa REISTETER ,  Rogerio RAMOS ,  Huanhui HU ,  Peter BYRNE

    IPC: G06F11/14 ,  G06F11/00

    Abstract: Embodiments described herein detect data corruption in a distributed data set system. For example, a system comprises node(s) for processing queries with respect to a distributed data set comprising a plurality of storage segments. A write transaction resulting from a query with respect to a particular storage segment is logged in a log record that describes a modification to the storage segment. A log service provides the log record to a data server managing a portion of the distributed data set in which the storage segment is included, which performs the write transaction with respect to the storage segment. For redundancy purposes, the data server has replica(s) that manage respective replicas of the portion of the distributed data set managed thereby. For backup purposes, snapshots of the replica(s) are periodically generated. To determine a data corruption, a snapshot of one replica is cross-validated with a snapshot of another replica.

    DATA VISIBILITY FOR NESTED TRANSACTIONS IN DISTRIBUTED SYSTEMS
    6.
    发明申请
    DATA VISIBILITY FOR NESTED TRANSACTIONS IN DISTRIBUTED SYSTEMS 有权

    公开(公告)号：US20220318263A1

    公开(公告)日：2022-10-06

    申请号：US17219007

    申请日：2021-03-31

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Sarvesh SINGH ,  Alan Dale HALVERSON ,  Sandeep LINGAM ,  Srikumar RANGARAJAN

    IPC: G06F16/27 ,  G06F9/46 ,  G06F16/901

    Abstract: Methods for data visibility in nested transactions in distributed systems are performed by systems and devices. Distributed executions of queries are performed in processing systems according to isolation level protocols with unique nested transaction identifiers for data management and versioning across one or more data sets, one or more compute pools, etc., within a logical server via a single transaction manager that oversees the isolation semantics and data versioning. A distributed query processor of the systems and devices performs nested transaction versioning for distributed tasks by generating nested transaction identifiers, encoded in data rows, which are used to enforce correct data visibility. Data visibility is restricted to previously committed data from distributed transactions and tasks, and is blocked for distributed transactions and tasks that run concurrently. Local commits for completed transactions and tasks are used to minimize transaction manager interactions, and instant rollbacks are enabled for aborted transactions and tasks.

    SNAPSHOT ISOLATION QUERY TRANSACTIONS IN DISTRIBUTED SYSTEMS
    7.
    发明申请
    SNAPSHOT ISOLATION QUERY TRANSACTIONS IN DISTRIBUTED SYSTEMS 有权

    公开(公告)号：US20220300483A1

    公开(公告)日：2022-09-22

    申请号：US17207219

    申请日：2021-03-19

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Sarvesh SINGH ,  Hari Krishna SUNDER ,  Srikumar RANGARAJAN ,  Steven John LINDELL ,  Sandeep LINGAM

    IPC: G06F16/23 ,  G06F16/27 ,  G06F16/2458

    Abstract: Methods for snapshot isolation query transactions in distributed systems are performed by systems and devices. Distributed executions of queries are performed in a processing system according to an isolation level protocol for data management and data versioning across one or more data sets, one or more compute pools, etc., within a logical server via a single transaction manager that oversees the isolation semantics and data versioning. Read transactions of queries are performed lock-free via the isolation semantics, and instant rollbacks, point-in-time queries, single-phase commits in the distributed systems are also provided. Abort and cleanup operations are performed based on a distributed abort protocol and a determined oldest active transaction for the system in which the single transaction manager does not track read-only transactions, and client nodes do not maintain commit tables for transactions.

    DATA VISIBILITY FOR NESTED TRANSACTIONS IN DISTRIBUTED SYSTEMS
    8.
    发明公开
    DATA VISIBILITY FOR NESTED TRANSACTIONS IN DISTRIBUTED SYSTEMS 审中-公开

    公开(公告)号：US20240134880A1

    公开(公告)日：2024-04-25

    申请号：US18400870

    申请日：2023-12-29

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Sarvesh SINGH ,  Alan Dale HALVERSON ,  Sandeep LINGAM ,  Srikumar RANGARAJAN

    IPC: G06F16/27 ,  G06F9/46 ,  G06F16/901

    CPC classification number: G06F16/27 ,  G06F9/466 ,  G06F16/9024

    Abstract: Methods for data visibility in nested transactions in distributed systems are performed by systems and devices. Distributed executions of queries are performed in processing systems according to isolation level protocols with unique nested transaction identifiers for data management and versioning across one or more data sets, one or more compute pools, etc., within a logical server via a single transaction manager that oversees the isolation semantics and data versioning. A distributed query processor of the systems and devices performs nested transaction versioning for distributed tasks by generating nested transaction identifiers, encoded in data rows, which are used to enforce correct data visibility. Data visibility is restricted to previously committed data from distributed transactions and tasks, and is blocked for distributed transactions and tasks that run concurrently. Local commits for completed transactions and tasks are used to minimize transaction manager interactions, and instant rollbacks are enabled for aborted transactions and tasks.

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