[SOLR-8621] solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.5, 6.0
• Assignee: Christine Poerschke
• Reporter: Christine Poerschke
• Created: 29/Jan/16 11:28
• Updated: 02/Jun/17 14:12
• Resolved: 12/Feb/16 21:04

Description

<mergePolicyFactory> end-user benefits:

• Lucene's UpgradeIndexMergePolicy can be configured in Solr
• Lucene's SortingMergePolicy can be configured in Solr (with SOLR-5730)
• customisability: arbitrary merge policies including wrapping/nested merge policies can be created and configured

roadmap:

• solr 5.5 introduces <mergePolicyFactory> support
• solr 5.5 deprecates (but maintains) <mergePolicy> support
• SOLR-8668 in solr 6.0(?) will remove <mergePolicy> support

Issue Links

• blocks: SOLR-5730 make Lucene's SortingMergePolicy and EarlyTerminatingSortingCollector configurable in Solr
• breaks: SOLR-8734 fix deprecation warnings for absent (maxMergeDocs|mergeFactor)
• is depended upon by: SOLR-8668 Remove support for <mergePolicy> (in favour of <mergePolicyFactory>)
• is related to: SOLR-9229 TestNRTOpen.testSharedCores() failures
• is related to: SOLR-8674 increase <mergePolicy> vs. <mergePolicyFactory> test coverage
• is related to: LUCENE-7005 TieredMergePolicy tweaks (>= vs. >, @see get vs. set)
• is required by: SOLR-5730 make Lucene's SortingMergePolicy and EarlyTerminatingSortingCollector configurable in Solr
• requires: LUCENE-7006 increase BaseMergePolicyTestCase use