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1.发明公开公开(公告)号：US20230350810A1
公开(公告)日：2023-11-02
申请号：US17732098
申请日：2022-04-28
Applicant: NetApp Inc.
Inventor： Anil Paul Thoppil , Wei Sun , Meera Odugoudar , Szu-Wen Kuo , Santhosh Selvaraj
IPC: G06F12/1018
CPC classification number: G06F12/1018
Abstract: Techniques are provided for implementing a hash building process and an append hash building process. The hash building process builds in-memory hash entries for bins of keys stored within sorted logs of a log structured merge tree used to store keys of a key-value store. The in-memory hash entries can be used to identify the starting locations of bins of keys within the log structured merge tree so that a key within a bin can be searched for from the starting location of the bin as opposed to having to search the entire log structured merge tree. The append hash building process builds two hashes that can be used to more efficiently locate keys and/or ranges of keys within an unsorted append log that would otherwise require a time consuming binary search of the entire append log.
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公开(公告)号：US11971859B2
公开(公告)日：2024-04-30
申请号：US17732046
申请日：2022-04-28
Applicant: NetApp Inc.
Inventor： Anil Paul Thoppil , Wei Sun , Meera Odugoudar , Szu-Wen Kuo , Santhosh Selvaraj
IPC: G06F16/17 , G06F16/174 , G06F16/182
CPC classification number: G06F16/1748 , G06F16/182
Abstract: Techniques are provided for implementing a defragmentation process during a merge operation performed by a re-compaction process upon a log structured merge tree. The log structured merge tree is used to store keys of key-value pairs within a key-value store. As the log structured merge tree fills with keys over time, the re-compaction process is performed to merge keys down to lower levels of the log structured merge tree to re-compact the keys. Re-compaction can result in fragmentation because there is a lack of spatial locality of where the re-compaction operations re-writes the keys within storage. Fragmentation increases read and write amplification when accessing the keys stored in different locations within the storage. Accordingly, the defragmentation process is performed during a last merge operation of the re-compaction process in order to store keys together within the storage, thus reducing read and write amplification when accessing the keys.
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公开(公告)号：US11216350B2
公开(公告)日：2022-01-04
申请号：US16855853
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Szu-Wen Kuo , Parag Sarfare , Ananthan Subramanian , Asif Imtiyaz Pathan , Santhosh Selvaraj , Nikhil Mattankot
IPC: G06F11/20 , H04L29/08 , H04L12/879 , H04L12/24
Abstract: Failover methods and systems for a networked storage environment are provided. A metadata data structure is generated, before starting a replay of entries at a log stored in a non-volatile memory of a second storage node, during a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node, and the metadata structure stores a metadata attribute of each log entry. Furthermore, the metadata attribute of each log entry is persistently stored. The persistently stored metadata attribute is used to respond to a read request received during the replay by the second storage node, while a write request metadata attribute of a write request is used for executing the write request received by the second storage node during the replay.
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公开(公告)号：US10324652B2
公开(公告)日：2019-06-18
申请号：US15631296
申请日：2017-06-23
Applicant: NetApp, Inc.
Inventor： Venkata Vijay Chaitanya Challapalli , Ravi Lingappa Shamanna , Kumaran Nagappan , Santhosh Selvaraj
Abstract: Methods, non-transitory computer readable media, and computing devices that facilitate copy-free data migrations across filesystems. In a first step with this technology, a first set of filesystem metadata associated with a first filesystem is received. At least a portion of the first set of filesystem metadata is retrieved from a first data structure associated with the first filesystem. The first set of filesystem metadata includes a first identifier and a physical location associated with user data. A second identifier, associated with a second filesystem having a different addressing scheme than the first filesystem, is generated from at least the first identifier. A second set of filesystem metadata including the second identifier and the physical location is stored such that at least the second identifier is stored in a second data structure associated with the second filesystem.
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公开(公告)号：US12204800B2
公开(公告)日：2025-01-21
申请号：US17732065
申请日：2022-04-28
Applicant: NetApp Inc.
Inventor： Anil Paul Thoppil , Wei Sun , Meera Odugoudar , Szu-Wen Kuo , Santhosh Selvaraj
Abstract: Techniques are provided for implementing a garbage collection process and a prediction read ahead mechanism to prefetch keys into memory to improve the efficiency and speed of the garbage collection process. A log structured merge tree is used to store keys of key-value pairs within a key-value store. If a key is no longer referenced by any worker nodes of a distributed storage architecture, then the key can be freed to store other data. Accordingly, garbage collection is performed to identify and free unused keys. The speed and efficiency of garbage collection is improved by dynamically adjusting the amount and rate at which keys are prefetched from disk and cached into faster memory for processing by the garbage collection process.
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Patent Agency Ranking
公开(公告)号：US20240281411A1
公开(公告)日：2024-08-22
申请号：US18648989
申请日：2024-04-29
Applicant: NetApp, Inc.
Inventor： Anil Paul Thoppil , Wei Sun , Meera Odugoudar , Szu-Wen Kuo , Santhosh Selvaraj
IPC: G06F16/174 , G06F16/182
CPC classification number: G06F16/1748 , G06F16/182
Abstract: Techniques are provided for implementing a defragmentation process during a merge operation performed by a re-compaction process upon a log structured merge tree. The log structured merge tree is used to store keys of key-value pairs within a key-value store. As the log structured merge tree fills with keys over time, the re-compaction process is performed to merge keys down to lower levels of the log structured merge tree to re-compact the keys. Re-compaction can result in fragmentation because there is a lack of spatial locality of where the re-compaction operations re-writes the keys within storage. Fragmentation increases read and write amplification when accessing the keys stored in different locations within the storage. Accordingly, the defragmentation process is performed during a last merge operation of the re-compaction process in order to store keys together within the storage, thus reducing read and write amplification when accessing the keys.
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公开(公告)号：US20230376392A1
公开(公告)日：2023-11-23
申请号：US18229107
申请日：2023-08-01
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
CPC classification number: G06F11/2069 , G06F11/1435 , G06F16/1824 , G06F11/3034 , G06F16/1734 , G06F11/0787
Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.
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公开(公告)号：US11269744B2
公开(公告)日：2022-03-08
申请号：US16855837
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Asif Imtiyaz Pathan , Santhosh Selvaraj , Nikhil Mattankot , Manan Patel , Travis Ryan Grusecki
Abstract: Failover methods and systems for a networked storage environment are provided. A filtering data structure and a metadata data structure are generated before starting a replay of a log stored in a non-volatile memory of a second storage node, during a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node to mirror at the log one or more write requests received by the first storage node prior to the failure, and data associated with the one or more write requests. The filtering data structure identifies each log entry and the metadata structure stores a metadata attribute of each log entry. The filtering data structure and the metadata structure are used for providing access to a logical storage object during the log replay from the second storage node.
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公开(公告)号：US20210334182A1
公开(公告)日：2021-10-28
申请号：US16855853
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Szu-Wen Kuo , Parag Sarfare , Ananthan Subramanian , Asif Imtiyaz Pathan , Santhosh Selvaraj , Nikhil Mattankot
IPC: G06F11/20 , H04L29/08 , H04L12/24 , H04L12/879
Abstract: Failover methods and systems for a networked storage environment are provided. A metadata data structure is generated, before starting a replay of entries at a log stored in a non-volatile memory of a second storage node, during a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node, and the metadata structure stores a metadata attribute of each log entry. Furthermore, the metadata attribute of each log entry is persistently stored. The persistently stored metadata attribute is used to respond to a read request received during the replay by the second storage node, while a write request metadata attribute of a write request is used for executing the write request received by the second storage node during the replay.
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公开(公告)号：US20210334180A1
公开(公告)日：2021-10-28
申请号：US16855870
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.
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