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From "Noble Paul (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-9454) Reduce object allocation during indexing because of JavaBinCodec.writeExternString()
Date Mon, 29 Aug 2016 15:53:20 GMT

     [ https://issues.apache.org/jira/browse/SOLR-9454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Noble Paul updated SOLR-9454:
-----------------------------
    Attachment: SOLR-9454.patch

> Reduce object allocation during indexing because of JavaBinCodec.writeExternString()
> ------------------------------------------------------------------------------------
>
>                 Key: SOLR-9454
>                 URL: https://issues.apache.org/jira/browse/SOLR-9454
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud, update
>            Reporter: Shalin Shekhar Mangar
>              Labels: difficulty-medium, impact-medium
>             Fix For: master (7.0), 6.3
>
>         Attachments: SOLR-9454.patch
>
>
> I setup Java Flight Recorder to profile indexing a 650MB JSON file using bin/post on
2 shard, 2 replica setup. It shows that the JavaBinCodec.writeExternString(String) method
contributes a lot of garbage during indexing in SolrCloud. More specifically, it contributes
~1GB of HashMap$Node objects and ~450MB of HashMap$Node[] objects.
> Most of this allocation is because every request is serialized using a new instance of
JavaBinUpdateRequestCodec which internally allocates a new HashMap for storing the extern
strings.
> We should explore keeping a global extern string map to eliminate redundant allocations.



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