plugins stored in weakhashmap lead memory leak
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Key: NUTCH-925
URL: https://issues.apache.org/jira/browse/NUTCH-925
Project: Nutch
Issue Type: Bug
Affects Versions: 1.2
Reporter: congliu
I suffer serious memory leak using Nutch 1.2 though a very deep crawl. I get
the error like this:
Exception in thread "Thread-113544" java.lang.OutOfMemoryError: PermGen space
at java.lang.Throwable.getStackTraceElement(Native Method)
at java.lang.Throwable.getOurStackTrace(Throwable.java:591)
at java.lang.Throwable.printStackTrace(Throwable.java:510)
at
org.apache.log4j.spi.ThrowableInformation.getThrowableStrRep(ThrowableInformation.java:76)
at
org.apache.log4j.spi.LoggingEvent.getThrowableStrRep(LoggingEvent.java:407)
at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:305)
at
org.apache.log4j.DailyRollingFileAppender.subAppend(DailyRollingFileAppender.java:359)
at org.apache.log4j.WriterAppender.append(WriterAppender.java:160)
at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
at
org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
at org.apache.log4j.Category.callAppenders(Category.java:206)
at org.apache.log4j.Category.forcedLog(Category.java:391)
at org.apache.log4j.Category.log(Category.java:856)
at org.slf4j.impl.Log4jLoggerAdapter.log(Log4jLoggerAdapter.java:509)
at
org.apache.commons.logging.impl.SLF4JLocationAwareLog.warn(SLF4JLocationAwareLog.java:173)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:256)
Exception in thread "main" java.io.IOException: Job failed!
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1252)
at org.apache.nutch.fetcher.Fetcher.fetch(Fetcher.java:1107)
at org.apache.nutch.crawl.Crawl.main(Crawl.java:133)
I guess Plugin repository cache lead to memory leak.
As u know plugins is stored in weakhashmap <conf, plugins>, and new class
classload
create when u need plugins.
Usually,WeakHashMap object can been gc, but class and classload is stored in
Perm NOT stack and gc can't perform in Perm, SO (java.lang.OutOfMemoryError:
PermGen space) occured..., is any nutch-issues have concerned this promble? or
there is any solution?
nutch-356 may help?
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