Feature #2620: Keep supports I/O locking - Arvados

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Feature #2620

closed

Keep supports I/O locking

Added by Tim Pierce over 10 years ago. Updated over 10 years ago.

Status:

Resolved

Priority:

Normal

Assigned To:

Tim Pierce

Category:

Target version:

2014-05-07 Storing and Organizing Data

Story points:

2.0

Description

Notes:

Lock is per-volume. It's the sysadmin's problem to ensure volumes don't share a spindle.
Lock is in-process (not flock). It's the sysadmin's problem to ensure keep servers don't share a volume.
Enable per-volume lock with -serialize flag.
Exempt from lock behavior: HEAD, index, and the process of discovering whether a block is present during a GET or PUT. In other words, we aren't strictly limiting IO to one client per spindle: we're assuming the OS has good enough cache behavior to support hordes of readdir operations alongside a big read/write without (statistically) causing thrash.

Subtasks 3 (0 open — 3 closed)

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Updated by Ward Vandewege over 10 years ago

Assigned To set to Tim Pierce

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Updated by Tim Pierce over 10 years ago

Tracker changed from Bug to Feature
Subject changed from Keep I/O locking to Keep supports I/O locking

An admin should be able to enable I/O locking: a per-spindle lock that prevents Keep from reading or writing to more than one file at a time. I/O operations on different spindles may still be executed concurrently.

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