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Posted to dev@storm.apache.org by "Dmytro Dragan (JIRA)" <ji...@apache.org> on 2015/09/25 16:34:04 UTC
[jira] [Updated] (STORM-1069) Usage of System.currentTimeMillis()
in KafkaSpout can create delays
[ https://issues.apache.org/jira/browse/STORM-1069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dmytro Dragan updated STORM-1069:
---------------------------------
Description:
_System.currentTimeMillis()_ returns the current time (wall-clock). Cause of this, you can suddenly get too big or even negative duration measured operation if between calls _System.currentTimeMillis()_ has changed the time (the adjusted time protocol NTP, administrator corrected clock, etc).
Theoretically, _(now - _lastUpdateMs)_ in 125 line could return negative values.
The better solution is to use _System.nanoTime()_ for measure elapsed time.
was:
_System.currentTimeMillis()_ returns the current time (wall-clock). Cause of this, you can suddenly get too big or even negative duration measured operation if between calls _System.currentTimeMillis()_ has changed the time ( hours translated to summer / winter time , the adjusted time protocol NTP, administrator corrected clock, etc).
Theoretically, _(now - _lastUpdateMs)_ in 125 line could return negative values.
The better solution is to use _System.nanoTime()_ for measure elapsed time.
> Usage of System.currentTimeMillis() in KafkaSpout can create delays
> --------------------------------------------------------------------
>
> Key: STORM-1069
> URL: https://issues.apache.org/jira/browse/STORM-1069
> Project: Apache Storm
> Issue Type: Bug
> Components: storm-kafka
> Reporter: Dmytro Dragan
> Priority: Trivial
> Labels: newbie
>
> _System.currentTimeMillis()_ returns the current time (wall-clock). Cause of this, you can suddenly get too big or even negative duration measured operation if between calls _System.currentTimeMillis()_ has changed the time (the adjusted time protocol NTP, administrator corrected clock, etc).
> Theoretically, _(now - _lastUpdateMs)_ in 125 line could return negative values.
> The better solution is to use _System.nanoTime()_ for measure elapsed time.
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