9eb797b099
Long explanation, but hopefully answers any questions. We don't like changing the default behavior of Swift unless there's a really good reason and, up until now, I've tried doing this with this new db_preallocation setting. For clusters with dedicated account/container servers that usually have fewer disks overall but SSD for speed, having db_preallocation on will gobble up disk space quite quickly and the fragmentation it's designed to fight isn't that big a speed impact to SSDs anyway. For clusters with account/container servers spread across all servers along with object servers usually having standard disks for cost, having db_preallocation off will cause very fragmented database files impacting speed, sometimes dramatically. Weighing these two negatives, it seems the second is the lesser evil. The first can cause disks to fill up and disable the cluster. The second will cause performance degradation, but the cluster will still function. Furthermore, if just one piece of code that touches all databases runs with db_preallocation on, it's effectively on for the whole cluster. We discovered this most recently when we finally configured everything within the Swift codebase to have db_preallocation off, only to find out Slogging didn't know about the new setting and so ran with it on and starting filling up SSDs. So that's why I'm proposing this change to the default behavior. We will definitely need to post a prominent notice of this change with the next release. Change-Id: I48a43439264cff5d03c14ec8787f718ee44e78ea
79 lines
2.4 KiB
Plaintext
79 lines
2.4 KiB
Plaintext
[DEFAULT]
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# bind_ip = 0.0.0.0
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# bind_port = 6002
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# backlog = 4096
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# workers = 1
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# user = swift
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# swift_dir = /etc/swift
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# devices = /srv/node
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# mount_check = true
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# You can specify default log routing here if you want:
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# log_name = swift
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# log_facility = LOG_LOCAL0
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# log_level = INFO
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# You can enable default statsD logging here and/or override it in sections
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# below:
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# log_statsd_host = localhost
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# log_statsd_port = 8125
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# log_statsd_default_sample_rate = 1
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# log_statsd_metric_prefix =
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# If you don't mind the extra disk space usage in overhead, you can turn this
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# on to preallocate disk space with SQLite databases to decrease fragmentation.
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# db_preallocation = off
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[pipeline:main]
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pipeline = account-server
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[app:account-server]
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use = egg:swift#account
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# You can override the default log routing for this app here:
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# set log_name = account-server
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# set log_facility = LOG_LOCAL0
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# set log_level = INFO
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# set log_requests = True
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# auto_create_account_prefix = .
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[account-replicator]
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# You can override the default log routing for this app here (don't use set!):
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# log_name = account-replicator
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# log_facility = LOG_LOCAL0
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# log_level = INFO
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# vm_test_mode = no
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# per_diff = 1000
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# max_diffs = 100
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# concurrency = 8
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# interval = 30
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# How long without an error before a node's error count is reset. This will
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# also be how long before a node is reenabled after suppression is triggered.
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# error_suppression_interval = 60
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# How many errors can accumulate before a node is temporarily ignored.
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# error_suppression_limit = 10
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# node_timeout = 10
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# conn_timeout = 0.5
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# The replicator also performs reclamation
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# reclaim_age = 604800
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# Time in seconds to wait between replication passes
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# run_pause = 30
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[account-auditor]
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# You can override the default log routing for this app here (don't use set!):
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# log_name = account-auditor
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# log_facility = LOG_LOCAL0
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# log_level = INFO
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# Will audit, at most, 1 account per device per interval
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# interval = 1800
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[account-reaper]
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# You can override the default log routing for this app here (don't use set!):
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# log_name = account-reaper
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# log_facility = LOG_LOCAL0
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# log_level = INFO
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# concurrency = 25
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# interval = 3600
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# node_timeout = 10
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# conn_timeout = 0.5
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# Normally, the reaper begins deleting account information for deleted accounts
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# immediately; you can set this to delay its work however. The value is in
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# seconds; 2592000 = 30 days for example.
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# delay_reaping = 0
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