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Merge pull request #1662 from dongluochen/avoidSimultaneousValidation

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Enforce minimum backoff to avoid simultaneous validation on one engine
This commit is contained in:
Victor Vieux
2016-01-21 14:19:06 -08:00
parent cd68850690 46a33f70ff
commit 5cb6f218dd
1 changed files with 5 additions and 2 deletions
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7
cluster/engine.go
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@@ -231,7 +231,7 @@ func (e *Engine) setState(state engineState) {
// TimeToValidate returns true if a pending node is up for validation
func (e *Engine) TimeToValidate() bool {
const validationLimit time.Duration = 4 * time.Hour
const failureBackoff time.Duration = 30 * time.Second
const minFailureBackoff time.Duration = 30 * time.Second
e.Lock()
defer e.Unlock()
if e.state != statePending {
@@ -239,7 +239,10 @@ func (e *Engine) TimeToValidate() bool {
}
sinceLastUpdate := time.Since(e.updatedAt)
// Increase check interval for a pending engine according to failureCount and cap it at a limit
if sinceLastUpdate > validationLimit || sinceLastUpdate > time.Duration(e.failureCount)*failureBackoff {
// it's exponential backoff = 2 ^ failureCount + minFailureBackoff. A minimum backoff is
// needed because e.failureCount could be 0 at first join, or the engine has a duplicate ID
if sinceLastUpdate > validationLimit ||
sinceLastUpdate > (1<<uint(e.failureCount))*time.Second+minFailureBackoff {
return true
}
return false