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https://issues.apache.org/jira/browse/SOLR-8856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217815#comment-15217815
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Markus Jelsma commented on SOLR-8856:
-------------------------------------
Hey - is this resolved? This is still open and it mentioned twice in 6.1.0's
changes.txt
{quote}
73 Optimizations
74 ----------------------
75 * SOLR-8722: Don't force a full ZkStateReader refresh on every Overseer
operation.
76 (Scott Blum via shalin)
77
78 * SOLR-8856: Do not cache merge or 'read once' contexts in the hdfs block
cache. (Mark Miller)
79
80 * SOLR-8745: Deprecate costly ZkStateReader.updateClusterState(), replace
with a narrow
81 forceUpdateCollection(collection) (Scott Blum via shalin)
82
83 * SOLR-8856: Do not cache merge or 'read once' contexts in the hdfs block
cache. (Mark Miller, Mike Drob)
{quote}
> Do not cache merge or 'read once' contexts in the hdfs block cache.
> -------------------------------------------------------------------
>
> Key: SOLR-8856
> URL: https://issues.apache.org/jira/browse/SOLR-8856
> Project: Solr
> Issue Type: Improvement
> Reporter: Mark Miller
> Assignee: Mark Miller
> Attachments: SOLR-8856.patch, SOLR-8856.patch, SOLR-8856.patch
>
>
> Generally the block cache will not be large enough to contain the whole index
> and merges can thrash the cache for queries. Even if we still look in the
> cache, we should not populate it.
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