madrob commented on a change in pull request #2284:
URL: https://github.com/apache/lucene-solr/pull/2284#discussion_r568085426



##########
File path: solr/bin/solr
##########
@@ -2026,7 +2026,11 @@ if [ "$GC_LOG_OPTS" != "" ]; then
     if [ "$JAVA_VENDOR" == "IBM J9" ]; then
       gc_log_flag="-Xverbosegclog"
     fi
-    GC_LOG_OPTS+=("$gc_log_flag:$SOLR_LOGS_DIR/solr_gc.log" 
'-XX:+UseGCLogFileRotation' '-XX:NumberOfGCLogFiles=9' '-XX:GCLogFileSize=20M')
+    if [ -z ${JAVA8_GC_LOG_FILE_OPTS+x} ]; then

Review comment:
       should be `:+`




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