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https://issues.apache.org/jira/browse/SOLR-5714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13898519#comment-13898519
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Hoss Man commented on SOLR-5714:
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bq. It defaults to false if not present in solrconfig.xml for back
compatibility. The latest solrconfig.xml will default it to true.
Why not just make the implicit default (if not present in config) contingent on
the luceneMatchVersion? if < 4.7, default=false; else default=true ?
> You should be able to use one pool of memory for multiple collection's HDFS
> block caches.
> -----------------------------------------------------------------------------------------
>
> Key: SOLR-5714
> URL: https://issues.apache.org/jira/browse/SOLR-5714
> Project: Solr
> Issue Type: Improvement
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 5.0, 4.7
>
> Attachments: SOLR-5714.patch
>
>
> Currently, you have to specify how much direct memory to allocate per
> SolrCore. This can be inefficient, and has some negative consequences - for
> instance, when replicating, many times two HDFS directories will exist for
> the same index briefly, which will double the RAM used for that SolrCore.
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