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https://issues.apache.org/jira/browse/PIG-1466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898020#action_12898020
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Thejas M Nair commented on PIG-1466:
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I am planning to change as following -
1. Change the string "low memory handler called" to "cleaner notified" .
2. Print additional log message stating total spill object memory freed and
total number of objects freed. This will be printed the first time a candidate
to be freed is found, and then every 10 times the GC is called from the code.
(GC is called after a threshold of memory suitable to be freed has been
collected.)
> Improve log messages for memory usage
> -------------------------------------
>
> Key: PIG-1466
> URL: https://issues.apache.org/jira/browse/PIG-1466
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Affects Versions: 0.7.0
> Reporter: Ashutosh Chauhan
> Assignee: Thejas M Nair
> Priority: Minor
> Fix For: 0.8.0
>
>
> For anything more then a moderately sized dataset Pig usually spits following
> messages:
> {code}
> 2010-05-27 18:28:31,659 INFO org.apache.pig.impl.util.SpillableMemoryManager:
> low memory handler called (Usage
> threshold exceeded) init = 4194304(4096K) used = 672012960(656262K) committed
> = 954466304(932096K) max =
> 954466304(932096K)
> 2010-05-27 18:10:52,653 INFO org.apache.pig.impl.util.SpillableMemoryManager:
> low memory handler called (Collection
> threshold exceeded) init = 4194304(4096K) used = 954466304(932096K) committed
> = 954466304(932096K) max =
> 954466304(932096K)
> {code}
> This seems to confuse users a lot. Once these messages are printed, users
> tend to believe that Pig is having hard time with memory, is spilling to disk
> etc. but in fact Pig might be cruising along at ease. We should be little
> more careful what to print in logs. Currently these are printed when a
> notification is sent by JVM and some other conditions are met which may not
> necessarily indicate low memory condition. Furthermore, with
> {{InternalCachedBag}} embraced everywhere in favor of {{DefaultBag}}, these
> messages have lost their usefulness. At the every least, we should lower the
> log level at which these are printed.
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