openstack/swift
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Add reconstructor section to deployment guide

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Change-Id: I062998e813718828b7adf4e7c3f877b6a31633c0
Closes-Bug: #1626290
This commit is contained in:
Alistair Coles 2017-07-20 11:40:17 +01:00
parent 3c11f6b8a8
commit 9c5628b4f1
2 changed files with 87 additions and 8 deletions
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79
doc/source/deployment_guide.rst
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@ -783,6 +783,85 @@ ionice_priority None I/O scheduling priority o
is set.
=========================== ======================== ================================
[object-reconstructor]
=========================== ======================== ================================
Option Default Description
--------------------------- ------------------------ --------------------------------
log_name object-reconstructor Label used when logging
log_facility LOG_LOCAL0 Syslog log facility
log_level INFO Logging level
log_address /dev/log Logging directory
daemonize yes Whether or not to run
reconstruction as a daemon
interval 30 Time in seconds to wait between
reconstruction passes
concurrency 1 Number of reconstruction threads to
spawn.
stats_interval 300 Interval in seconds between
logging reconstruction statistics
handoffs_only false The handoffs_only mode option is for
special case emergency situations
during rebalance such as disk full in
the cluster. This option SHOULD NOT
BE CHANGED, except for extreme
situations. When handoffs_only mode
is enabled the reconstructor will
*only* revert fragments from handoff
nodes to primary nodes and will not
sync primary nodes with neighboring
primary nodes. This will force the
reconstructor to sync and delete
handoffs' fragments more quickly and
minimize the time of the rebalance by
limiting the number of rebuilds. The
handoffs_only option is only for
temporary use and should be disabled
as soon as the emergency situation
has been resolved.
node_timeout DEFAULT or 10 Request timeout to external
services. The value used is the value
set in this section, or the value set
in the DEFAULT section, or 10.
http_timeout 60 Max duration of an http request.
This is for REPLICATE finalization
calls and so should be longer
than node_timeout.
lockup_timeout 1800 Attempts to kill all threads if
no fragment has been reconstructed
for lockup_timeout seconds.
ring_check_interval 15 Interval for checking new ring
file
recon_cache_path /var/cache/swift Path to recon cache
nice_priority None Scheduling priority of server
processes. Niceness values
range from -20 (most favorable
to the process) to 19 (least
favorable to the process).
The default does not modify
priority.
ionice_class None I/O scheduling class of server
processes. I/O niceness class
values are IOPRIO_CLASS_RT (realtime),
IOPRIO_CLASS_BE (best-effort),
and IOPRIO_CLASS_IDLE (idle).
The default does not modify
class and priority.
Linux supports io scheduling
priorities and classes since
2.6.13 with the CFQ io scheduler.
Work only with ionice_priority.
ionice_priority None I/O scheduling priority of server
processes. I/O niceness priority
is a number which goes from
0 to 7. The higher the value,
the lower the I/O priority of
the process.
Work only with ionice_class.
Ignored if IOPRIO_CLASS_IDLE
is set.
=========================== ======================== ================================
[object-updater]
=================== =================== ==========================================

16
etc/object-server.conf-sample
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@ -324,14 +324,14 @@ use = egg:swift#recon
# The handoffs_only mode option is for special case emergency situations during
# rebalance such as disk full in the cluster. This option SHOULD NOT BE
# CHANGED, except for extreme situations. When handoffs_only mode is enabled
# the reconstructor will *only* revert rebalance fragments to primaries and not
# attempt to sync any primary parts with neighbor primaries. This will force
# the reconstructor to sync and delete handoffs fragments more quickly and
# minimize the time of the rebalance by limiting the number of rebuilds. The
# handoffs_only option is only for temporary use, it should be disabled as soon
# as the emergency situation is resolved. When handoffs_only is not set, the
# deprecated handoffs_first option will be honored as a synonym, but may be
# ignored in a future release.
# the reconstructor will *only* revert fragments from handoff nodes to primary
# nodes and will not sync primary nodes with neighboring primary nodes. This
# will force the reconstructor to sync and delete handoffs' fragments more
# quickly and minimize the time of the rebalance by limiting the number of
# rebuilds. The handoffs_only option is only for temporary use and should be
# disabled as soon as the emergency situation has been resolved. When
# handoffs_only is not set, the deprecated handoffs_first option will be
# honored as a synonym, but may be ignored in a future release.
# handoffs_only = False
#
# You can set scheduling priority of processes. Niceness values range from -20