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SOLR-18552: Set MMapDirectory shared arena permits to 64 #5181

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SOLR-18552: Set MMapDirectory shared arena permits to 64 #5181

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a5406c9
SOLR-18552: Set MMapDirectory shared arena permits to 64
nick-boss-tech Oct 19, 2026
0652af4
SOLR-18552: Set the arena limit on the solr.cmd init line
nick-boss-tech Oct 19, 2026
cb32d0d
SOLR-18552: Set the arena limit on the bin/solr init line
nick-boss-tech Oct 19, 2026
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7 changes: 7 additions & 0 deletions changelog/unreleased/SOLR-18552-mmap-arena-permits.yml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
title: Set a lower shared arena permit limit for MMapDirectory
type: changed
authors:
- name: Nick Shanin
links:
- name: SOLR-18552
url: https://issues.apache.org/jira/browse/SOLR-18552
3 changes: 2 additions & 1 deletion solr/bin/solr
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Expand Up @@ -722,7 +722,8 @@ fi
FG="false"
FORCE=false
SOLR_OPTS=(${SOLR_OPTS:-})
SCRIPT_SOLR_OPTS=()
# Use the lower shared arena permit limit recommended for Lucene 9.
SCRIPT_SOLR_OPTS=("-Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=64")
PASS_TO_RUN_EXAMPLE=()

if [ $# -gt 0 ]; then
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3 changes: 2 additions & 1 deletion solr/bin/solr.cmd
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Expand Up @@ -789,7 +789,8 @@ IF NOT "%SOLR_HOST%"=="" (
set SOLR_HOST_ARG=
)

set SCRIPT_SOLR_OPTS=
REM Use the lower shared arena permit limit recommended for Lucene 9.
set "SCRIPT_SOLR_OPTS=-Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=64"

REM Default placement plugin
IF DEFINED SOLR_PLACEMENTPLUGIN_DEFAULT (
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