Add fallocate_reserve to account and container servers.

Code Issues Proposed changes

The object server can be configured to leave a certain amount of disk
space free; default is 1%. This is useful in avoiding 100%-full
filesystems, as those can get Swift in a state where the filesystem is
too full to write tombstones, so you can't delete objects to free up
space.
When a cluster has accounts/containers and objects on the same disks,
then you can wind up with a 100%-full disk since account and container
servers don't respect fallocate_reserve. This commit makes account and
container servers respect fallocate_reserve so that disks shared
between account/container and object rings won't get 100% full.
When a disk's free space falls below the configured reserve, account
and container PUT, POST, and REPLICATE requests will fail with a 507
status code. These are the operations that can significantly increase
the disk space used by a given database.
I called the parameter "fallocate_reserve" for consistency with the
object server. No actual fallocate() call happens under Swift's
control in the account or container servers (sqlite3 might make such a
call, but it's out of our hands).
Change-Id: I083442eef14bf83c0ea717b1decb3e6b56dbf1d0

This commit is contained in:

Samuel Merritt

2018年02月05日 14:06:18 -08:00

committed by Matthew Oliver

parent bea74a3260

commit 8e651a2d3d

10 changed files with 321 additions and 7 deletions

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7
etc/account-server.conf-sample

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@@ -97,6 +97,13 @@ use = egg:swift#account

# Work only with ionice_class.

# ionice_class =

# ionice_priority =

#

# You can set fallocate_reserve to the number of bytes or percentage

# of disk space you'd like kept free at all times. If the disk's free

# space falls below this value, then PUT, POST, and REPLICATE requests

# will be denied until the disk ha s more space available. Percentage

# will be used if the value ends with a '%'.

# fallocate_reserve = 1%

[filter:healthcheck]

use = egg:swift#healthcheck

Add fallocate_reserve to account and container servers.

7 etc/account-server.conf-sample Unescape Escape View File

7
etc/account-server.conf-sample

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