Add handoffs-only mode to DB replicators.

Code Issues Proposed changes

The object reconstructor has a handoffs-only mode that is very useful
when a cluster requires rapid rebalancing, like when disks are nearing
fullness. This mode's goal is to remove handoff partitions from disks
without spending effort on primary partitions. The object replicator
has a similar mode, though it varies in some details.
This commit adds a handoffs-only mode to the account and container
replicators.
Change-Id: I588b151ee65ae49d204bd6bf58555504c15edf9f
Closes-Bug: 1668399

This commit is contained in:

Samuel Merritt

2018年02月16日 16:37:58 -08:00

parent 2bfd9c6a9b

commit 47fed6f2f9

4 changed files with 219 additions and 10 deletions

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19
etc/account-server.conf-sample

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@@ -163,6 +163,25 @@ use = egg:swift#recon

# Work only with ionice_class.

# ionice_class =

# ionice_priority =

#

# The handoffs_only mode option is for special-case emergency

# situations such as full disks in the cluster. This option SHOULD NOT

# BE ENABLED except in emergencies. When handoffs_only mode is enabled

# the replicator will *only* replicate from handoff nodes to primary

# nodes and will not sync primary nodes with other primary nodes.

#

# This has two main effects: first, the replicator becomes much more

# effective at removing misplaced databases, thereby freeing up disk

# space at a much faster pace than normal. Second, the replicator does

# not sync data between primary nodes, so out-of-sync account and

# container listings will not resolve while handoffs_only is enabled.

#

# This mode is intended to allow operators to temporarily sacrifice

# consistency in order to gain faster rebalancing, such as during a

# capacity addition with nearly-full disks. It is not intended for

# long-term use.

#

# handoffs_only = no

[account-auditor]

# You can override the default log routing for this app here (don't use set!):

Add handoffs-only mode to DB replicators.

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

19
etc/account-server.conf-sample

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