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https://issues.apache.org/jira/browse/SOLR-7843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pablo Lozano closed SOLR-7843.
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Resolution: Not A Problem
> Importing Deltal create a memory leak
> -------------------------------------
>
> Key: SOLR-7843
> URL: https://issues.apache.org/jira/browse/SOLR-7843
> Project: Solr
> Issue Type: Bug
> Components: contrib - DataImportHandler
> Affects Versions: 5.2.1
> Reporter: Pablo Lozano
> Labels: memory-leak
>
> The org.apache.solr.handler.dataimport.SolrWriter is not correctly cleaning
> itself after finishing importing Deltas as the "Set<Object> deltaKeys" is not
> being cleaned after the process has finished.
> When using a custom importer or DataSource for my case I need to add
> additional parameters to the delta keys.
> When the data import finishes the DeltaKeys is not set back to null and the
> DataImporter, DocBuilder and the SolrWriter are mantained as live objects
> because there are being referenced by the "infoRegistry" of the SolrCore
> which seems to be used for Jmx information.
> It appears that starting a second delta import did not freed the memory which
> may cause on the long run an OutOfMemory, I have not checked if starting a
> full import would break the references and free the memory.
> An easy fix is possible which would be to add to the SolrWriter "deltaKeys =
> null;" on the close method.
> Or nullify the writer on DocBuilder after being used on the method execute();
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