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49 lines
2.1 KiB
Go
49 lines
2.1 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package backend
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import (
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"time"
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)
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const (
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// DefaultBufferCapacity is a default circular buffer size
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// used by backends to fan out events
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DefaultBufferCapacity = 1024
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// DefaultBacklogGracePeriod is the default amount of time that the circular buffer
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// will tolerate an event backlog in one of its watchers. Value was selected to be
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// just under 1m since 1m is typically the highest rate that high volume events
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// (e.g. heartbeats) are be created. If a watcher can't catch up in under a minute,
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// it probably won't catch up.
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DefaultBacklogGracePeriod = time.Second * 59
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// DefaultCreationGracePeriod is the default amount of time time that the circular buffer
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// will wait before enforcing the backlog grace period. This is intended to give downstream
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// caches time to initialize before they start receiving events. Without this, large caches
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// may be unable to successfully initialize even if they would otherwise be able to keep up
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// with the event stream once established.
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DefaultCreationGracePeriod = DefaultBacklogGracePeriod * 3
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// DefaultPollStreamPeriod is a default event poll stream period
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DefaultPollStreamPeriod = time.Second
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// DefaultEventsTTL is a default events TTL period
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DefaultEventsTTL = 10 * time.Minute
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// DefaultRangeLimit is used to specify some very large limit when limit is not specified
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// explicitly to prevent OOM due to infinite loops or other issues along those lines.
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DefaultRangeLimit = 2_000_000
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)
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