Do not create a global statsd "previous instance"

this basically reverts #887

at some point we might want to do some special handling of reloading
plugins and keeping their state intact, but that will need to be done at
a higher level, and in a way that is thread-safe for multiple input
plugins of the same type.

Unfortunately this is a rather large feature that will not have a quick
fix available for it.

fixes #1975
fixes #2102
This commit is contained in:
Cameron Sparr 2016-12-20 17:48:06 +00:00
parent 491ba10b00
commit 73acd114d1
2 changed files with 14 additions and 14 deletions

View File

@ -6,6 +6,15 @@
will change te default behavior for users who were not specifying these parameters
in their config file.
- The StatsD plugin will also no longer save it's state on a service reload.
Essentially we have reverted PR [#887](https://github.com/influxdata/telegraf/pull/887).
The reason for this is that saving the state in a global variable is not
thread-safe (see [#1975](https://github.com/influxdata/telegraf/issues/1975) & [#2102](https://github.com/influxdata/telegraf/issues/2102)),
and this creates issues if users want to define multiple instances
of the statsd plugin. Saving state on reload may be considered in the future,
but this would need to be implemented at a higher level and applied to all
plugins, not just statsd.
### Features
- [#2123](https://github.com/influxdata/telegraf/pull/2123): Fix improper calculation of CPU percentages
@ -52,6 +61,7 @@ in their config file.
- [#1449](https://github.com/influxdata/telegraf/issues/1449): MongoDB plugin always shows 0 replication lag.
- [#1825](https://github.com/influxdata/telegraf/issues/1825): Consul plugin: add check_id as a tag in metrics to avoid overwrites.
- [#1973](https://github.com/influxdata/telegraf/issues/1973): Partial fix: logparser CLF pattern with IPv6 addresses.
- [#1975](https://github.com/influxdata/telegraf/issues/1975) & [#2102](https://github.com/influxdata/telegraf/issues/2102): Fix thread-safety when using multiple instances of the statsd input plugin.
## v1.1.2 [2016-12-12]

View File

@ -32,8 +32,6 @@ var dropwarn = "E! Error: statsd message queue full. " +
"We have dropped %d messages so far. " +
"You may want to increase allowed_pending_messages in the config\n"
var prevInstance *Statsd
type Statsd struct {
// Address & Port to serve from
ServiceAddress string
@ -244,17 +242,10 @@ func (s *Statsd) Start(_ telegraf.Accumulator) error {
s.done = make(chan struct{})
s.in = make(chan []byte, s.AllowedPendingMessages)
if prevInstance == nil {
s.gauges = make(map[string]cachedgauge)
s.counters = make(map[string]cachedcounter)
s.sets = make(map[string]cachedset)
s.timings = make(map[string]cachedtimings)
} else {
s.gauges = prevInstance.gauges
s.counters = prevInstance.counters
s.sets = prevInstance.sets
s.timings = prevInstance.timings
}
if s.ConvertNames {
log.Printf("I! WARNING statsd: convert_names config option is deprecated," +
@ -271,7 +262,6 @@ func (s *Statsd) Start(_ telegraf.Accumulator) error {
// Start the line parser
go s.parser()
log.Printf("I! Started the statsd service on %s\n", s.ServiceAddress)
prevInstance = s
return nil
}