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https://issues.apache.org/jira/browse/KAFKA-10063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson updated KAFKA-10063:
------------------------------------
Description:
We have a few log cleaner metrics which iterate the set of cleaners. For
example:
{code}
newGauge("max-clean-time-secs", () =>
cleaners.iterator.map(_.lastStats.elapsedSecs).max.toInt)
{code}
It seems possible currently for LogCleaner metrics to get queried after
shutdown of the log cleaner, which clears the `cleaners` collection. This can
lead to the following error:
{code}
java.lang.UnsupportedOperationException: empty.max
at scala.collection.IterableOnceOps.max(IterableOnce.scala:952)
at scala.collection.IterableOnceOps.max$(IterableOnce.scala:950)
at scala.collection.AbstractIterator.max(Iterator.scala:1279)
at
kafka.log.LogCleaner.kafka$log$LogCleaner$$$anonfun$new$9(LogCleaner.scala:132)
at kafka.log.LogCleaner$$anonfun$4.value(LogCleaner.scala:132)
at kafka.log.LogCleaner$$anonfun$4.value(LogCleaner.scala:132)
{code}
was:
We have a few log cleaner metrics which iterate the set of cleaners. For
example:
{code}
newGauge("max-clean-time-secs", () =>
cleaners.iterator.map(_.lastStats.elapsedSecs).max.toInt)
{code}
It seems possible currently for LogCleaner metrics to get queried after
shutdown of the log cleaner, which clears the `cleaners` collection. This can
lead to the following error:
{code}
ava.lang.UnsupportedOperationException: empty.max
at scala.collection.IterableOnceOps.max(IterableOnce.scala:952)
at scala.collection.IterableOnceOps.max$(IterableOnce.scala:950)
at scala.collection.AbstractIterator.max(Iterator.scala:1279)
at
kafka.log.LogCleaner.kafka$log$LogCleaner$$$anonfun$new$9(LogCleaner.scala:132)
at kafka.log.LogCleaner$$anonfun$4.value(LogCleaner.scala:132)
at kafka.log.LogCleaner$$anonfun$4.value(LogCleaner.scala:132)
{code}
> UnsupportedOperation when querying cleaner metrics after shutdown
> -----------------------------------------------------------------
>
> Key: KAFKA-10063
> URL: https://issues.apache.org/jira/browse/KAFKA-10063
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Priority: Major
>
> We have a few log cleaner metrics which iterate the set of cleaners. For
> example:
> {code}
> newGauge("max-clean-time-secs", () =>
> cleaners.iterator.map(_.lastStats.elapsedSecs).max.toInt)
> {code}
> It seems possible currently for LogCleaner metrics to get queried after
> shutdown of the log cleaner, which clears the `cleaners` collection. This can
> lead to the following error:
> {code}
> java.lang.UnsupportedOperationException: empty.max
> at scala.collection.IterableOnceOps.max(IterableOnce.scala:952)
> at scala.collection.IterableOnceOps.max$(IterableOnce.scala:950)
> at scala.collection.AbstractIterator.max(Iterator.scala:1279)
> at
> kafka.log.LogCleaner.kafka$log$LogCleaner$$$anonfun$new$9(LogCleaner.scala:132)
> at kafka.log.LogCleaner$$anonfun$4.value(LogCleaner.scala:132)
> at kafka.log.LogCleaner$$anonfun$4.value(LogCleaner.scala:132)
> {code}
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