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Merge pull request #4164 from hashicorp/raft-default-docs 

website: add raft snapshot setting defaults
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Jack Pearkes 2018-06-01 09:06:00 -07:00 committed by GitHub
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website/source/docs/agent/options.html.md
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@ -364,14 +364,15 @@ will exit with an error at startup.
rarely need to be changed. Very busy clusters experiencing excessive disk IO may increase this value to reduce disk IO, and minimize rarely need to be changed. Very busy clusters experiencing excessive disk IO may increase this value to reduce disk IO, and minimize
the chances of all servers taking snapshots at the same time. Increasing this trades off disk IO for disk space since the log will the chances of all servers taking snapshots at the same time. Increasing this trades off disk IO for disk space since the log will
grow much larger and the space in the raft.db file can't be reclaimed till the next snapshot. Servers may take longer to recover from grow much larger and the space in the raft.db file can't be reclaimed till the next snapshot. Servers may take longer to recover from
crashes or failover if this is increased significantly as more logs will need to be replayed. crashes or failover if this is increased significantly as more logs will need to be replayed. In Consul 1.1.0 and later this
defaults to 16384, and in prior versions it was set to 8192.
* <a name="_raft_snapshot_interval"></a><a href="#_raft_snapshot_interval">`-raft-snapshot-interval`</a> - This controls how often servers * <a name="_raft_snapshot_interval"></a><a href="#_raft_snapshot_interval">`-raft-snapshot-interval`</a> - This controls how often servers
check if they need to save a snapshot to disk. his is a low-level parameter that should rarely need to be changed. Very busy clusters check if they need to save a snapshot to disk. his is a low-level parameter that should rarely need to be changed. Very busy clusters
experiencing excessive disk IO may increase this value to reduce disk IO, and minimize the chances of all servers taking snapshots at the same time. experiencing excessive disk IO may increase this value to reduce disk IO, and minimize the chances of all servers taking snapshots at the same time.
Increasing this trades off disk IO for disk space since the log will grow much larger and the space in the raft.db file can't be reclaimed Increasing this trades off disk IO for disk space since the log will grow much larger and the space in the raft.db file can't be reclaimed
till the next snapshot. Servers may take longer to recover from crashes or failover if this is increased significantly as more logs till the next snapshot. Servers may take longer to recover from crashes or failover if this is increased significantly as more logs
will need to be replayed. will need to be replayed. In Consul 1.1.0 and later this defaults to `30s`, and in prior versions it was set to `5s`.
* <a name="_recursor"></a><a href="#_recursor">`-recursor`</a> - Specifies the address of an upstream DNS * <a name="_recursor"></a><a href="#_recursor">`-recursor`</a> - Specifies the address of an upstream DNS
server. This option may be provided multiple times, and is functionally server. This option may be provided multiple times, and is functionally