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VReplication: Make Source Tablet Selection More Robust (vitessio#13582)
Signed-off-by: Matt Lord <mattalord@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| /* | ||
| Copyright 2022 The Vitess Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package vterrors | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "vitess.io/vitess/go/vt/log" | ||
| ) | ||
|
|
||
| /* | ||
| * LastError tracks the most recent error for any ongoing process and how long it has persisted. | ||
| * The err field should be a vterror to ensure we have meaningful error codes, causes, stack | ||
| * traces, etc. | ||
| */ | ||
| type LastError struct { | ||
| name string | ||
| err error | ||
| firstSeen time.Time | ||
| lastSeen time.Time | ||
| mu sync.Mutex | ||
| maxTimeInError time.Duration // if error persists for this long, shouldRetry() will return false | ||
| } | ||
|
|
||
| func NewLastError(name string, maxTimeInError time.Duration) *LastError { | ||
| return &LastError{ | ||
| name: name, | ||
| maxTimeInError: maxTimeInError, | ||
| } | ||
| } | ||
|
|
||
| func (le *LastError) Record(err error) { | ||
| le.mu.Lock() | ||
| defer le.mu.Unlock() | ||
| if err == nil { | ||
| le.err = nil | ||
| le.firstSeen = time.Time{} | ||
| le.lastSeen = time.Time{} | ||
| return | ||
| } | ||
| if !Equals(err, le.err) { | ||
| le.firstSeen = time.Now() | ||
| le.lastSeen = time.Now() | ||
| le.err = err | ||
| } else { | ||
| // same error seen | ||
| if time.Since(le.lastSeen) > le.maxTimeInError { | ||
| // reset firstSeen, since it has been long enough since the last time we saw this error | ||
| log.Infof("Resetting firstSeen for %s, since it is too long since the last one", le.name) | ||
| le.firstSeen = time.Now() | ||
| } | ||
| le.lastSeen = time.Now() | ||
| } | ||
| } | ||
|
|
||
| func (le *LastError) ShouldRetry() bool { | ||
| le.mu.Lock() | ||
| defer le.mu.Unlock() | ||
| if le.maxTimeInError == 0 { | ||
| // The value of 0 means "no time limit" | ||
| return true | ||
| } | ||
| if le.firstSeen.IsZero() { | ||
| return true | ||
| } | ||
| if time.Since(le.firstSeen) <= le.maxTimeInError { | ||
| // within the max time range | ||
| return true | ||
| } | ||
| log.Errorf("%s: the same error was encountered continuously since %s, it is now assumed to be unrecoverable; any affected operations will need to be manually restarted once error '%s' has been addressed", | ||
| le.name, le.firstSeen.UTC(), le.err) | ||
| return false | ||
| } |
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