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https://issues.apache.org/jira/browse/NUTCH-2407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16125730#comment-16125730
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Sebastian Nagel commented on NUTCH-2407:
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Thanks [~Vyacheslav],
could you run {{jmap -histo <pid>}} to see which objects leak? Ideally, twice
during a crawl: first, after the first cycle, then later after more cycles.
> Memory leak causing Nutch Server to run out of memory
> -----------------------------------------------------
>
> Key: NUTCH-2407
> URL: https://issues.apache.org/jira/browse/NUTCH-2407
> Project: Nutch
> Issue Type: Bug
> Components: nutch server
> Affects Versions: 2.3.1
> Environment: Ubuntu 16.04 64-bit
> Oracle Java 8 64-bit
> Nutch 2.3.1 (standalone deployment)
> MongoDB 3.4
> Reporter: Vyacheslav Pascarel
>
> My application is trying to perform continuous crawling using Nutch REST
> services. The application injects a seed URL and then repeats
> GENERATE/FETCH/PARSE/UPDATEDB sequence requested number of times (each step
> in the sequence is executed upon successful competition of the previous step
> then the whole sequence is repeated again). Here is a brief description of
> the job:
> * Number of GENERATE/FETCH/PARSE/UPDATEDB cycles per run: 50
> * 'topN' parameter value of GENERATE step in each cycle: 10
> * Seed URL: http://www.cnn.com
> * Regex URL filters for all jobs:
> ** *"-^.\{1000,\}$"* - exclude very long URLs
> ** *"+."* - include the rest
> To monitor Nutch server I use Java VisualVM that comes with Java SDK. After
> each run (50 cycles of GENERATE/FETCH/PARSE/UPDATEDB) I perform garbage
> collection using the mentioned tool and check memory usage. My observation is
> that Nutch Server leaks ~25MB per run.
> NOTES: I added custom HTTP DELETE services to clean job history in
> NutchServerPoolExecutor and remove all custom configurations from
> RAMConfManager after each run. So observed ~25MB memory leak is after job
> history/configuration cleanup.
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