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Use exponential backoff strategy to validate pending engine. 

Signed-off-by: Dong Chen <dongluo.chen@docker.com>
This commit is contained in:
Dong Chen 2016-01-21 14:02:34 -08:00
parent 14bfc52d36
commit 46a33f70ff
1 changed files with 5 additions and 4 deletions
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9
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 {
@ -239,9 +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
// '+1' would enforce a minimum backoff because e.failureCount could be 0 at first join, or
// the engine has a duplicate ID
if sinceLastUpdate > validationLimit || sinceLastUpdate > time.Duration(e.failureCount+1)*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