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https://issues.apache.org/jira/browse/SOLR-4934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688104#comment-13688104
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Shawn Heisey commented on SOLR-4934:
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I was getting ready to file an issue, glad I found this before doing so. The
only thing I knew was that LUCENE-5038 had caused Solr to make compound files
and the useCompoundFile setting under indexConfig that I found in the branch_4x
example wasn't turning it off.
A connected discussion, for which I can file an issue if necessary: Assuming
there are plenty of file descriptors available, will a user get better
performance from compound files or separate files? Is it dependent on other
factors like filesystem choice, or is one a clear winner? The outcome of that
discussion should decide what Solr's default is when no related config options
are used.
> Prevent runtime failure if users use initargs "useCompoundFile" setting on
> LogMergePolicy or TieredMergePolicy
> --------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-4934
> URL: https://issues.apache.org/jira/browse/SOLR-4934
> Project: Solr
> Issue Type: Bug
> Reporter: Hoss Man
> Assignee: Hoss Man
> Fix For: 5.0, 4.4
>
>
> * LUCENE-5038 eliminated setUseCompoundFile(boolean) from the built in
> MergePolicies
> * existing users may have configs that use <mergePolicy> init args to try and
> call that setter
> * we already do some explicit checks for these MergePolices in
> SolrIndexConfig to deal with legacy syntax
> * update the existing logic to remove "useCompoundFile" from the MergePolicy
> initArgs for these known policies if found, and log a warning.
> (NOTE: i don't want to arbitrarily remove "useCompoundFile" from the initArgs
> regardless of class in case someone has a custom MergePolicy that implements
> that logic -- that would suck)
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