Neal J Charbonneau, Age 3818 Stickney Rd, Medford, MA 02155

2017027, Sep 28, 2017

Mar 25, 2016

15/081652

- Seattle WA, US
MICHAEL ROBERT FRASCA - CAMBRIDGE MA, US
NEAL JOHN CHARBONNEAU - MEDFORD MA, US

Amazon Technologies, Inc. - Seattle WA

G06F 17/30
G06F 3/06

An LL server (LLS) may process metadata requests for a file system in LL mode in a distributed file storage services (DFSS). For requests that require allocating blocks to file system objects in the backing store, instead of relying on distributed transactions used for file systems in high throughput (HT) mode, a pool of blocks may be pre-allocated for the LL file system in the backing store, and a free block list may be maintained in local memory of the LLS. When a metadata operation requires blocks to be allocated, the blocks are assigned to the respective object from the blocks in the pool. A background process may allocate new blocks in the pool upon the number of blocks dropping below a threshold, or upon block allocation rate for the file system increasing.

2017027, Sep 28, 2017

Mar 25, 2016

15/081647

- Seattle WA, US
JACOB DAVID LUSZCZ - SOMERVILLE MA, US
MICHAEL ROBERT FRASCA - CAMBRIDGE MA, US
DANIEL NUSSBAUM - CAMBRIDGE MA, US
PETER JONES - LEXINGTON MA, US
XIAOBIN WU - ACTON MA, US
JOHN MCCLAIN - LEXINGTON MA, US
NEAL JOHN CHARBONNEAU - MEDFORD MA, US
Wayne William Duso - Shrewsbury MA, US
Mark Allen Fogleman - Cambridge MA, US
Edward William Naim - Westwood MA, US

Amazon Technologies, Inc. - Seattle WA

G06F 17/30

A low latency metadata subsystem for file systems in low latency (LL) mode in a distributed file storage service (DFSS). An LL server (LLS) may receive metadata requests from an access node of the DFSS. For read operations, the LLS may check a local cache of metadata and, for cache hits, retrieve the metadata from the cache. For cache misses, the metadata may be fetched from the storage subsystem of the DFSS and cached. For write operations, the LLS may write entries into a journal for the file system and notify the access node after the journal entries are committed to the journal; the journal entries are asynchronously committed in the storage subsystem. The access node may communicate with the storage subsystem to perform data reads and writes for the LL file system.

2017027, Sep 28, 2017

Mar 25, 2016

15/081651

- Seattle WA, US
Jocob David LUSZCZ - Somerville MA, US
Peter JONES - Lexington MA, US
Michael Robert FRASCA - Cambridge MA, US
Neal John CHARBONNEAU - Medford MA, US

Amazon Technologies, Inc. - Seattle WA

G06F 17/30

A distributed file storage services (DFSS) that provides low latency (LL) and high throughput (HT) modes for file systems. A HT metadata subsystem (HTMS) may use a distributed transaction system for data and metadata reads and writes for file systems in HT mode. A LL metadata subsystem (LLMS) may process metadata requests for file systems in LL mode. For metadata read requests, the LLMS may locally cache at least some of the file system metadata. For metadata write requests, the LLMS may write entries to a journal and notify the access node after the entries are committed to the journal. Data reads and writes for file systems in LL mode may be handled similarly to data reads and writes for file systems in HT mode. A file system may be converted from LL to HT mode, or from HT to LL mode.