Index: oak-run/src/main/java/org/apache/jackrabbit/oak/run/SegmentTarUtils.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- oak-run/src/main/java/org/apache/jackrabbit/oak/run/SegmentTarUtils.java	(date 1510607945000)
+++ oak-run/src/main/java/org/apache/jackrabbit/oak/run/SegmentTarUtils.java	(date 1510610028000)
@@ -179,6 +179,7 @@
                 .withPath(directory)
                 .withMmap(mmap)
                 .withForce(force)
+                .withSegmentCacheSize(TAR_SEGMENT_CACHE_SIZE)
                 .build()
                 .run();
     }
Index: oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/tool/Compact.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/tool/Compact.java	(date 1510607945000)
+++ oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/tool/Compact.java	(date 1510610028000)
@@ -18,6 +18,7 @@
 package org.apache.jackrabbit.oak.segment.tool;
 
 import static com.google.common.base.Preconditions.checkNotNull;
+import static org.apache.jackrabbit.oak.segment.SegmentCache.DEFAULT_SEGMENT_CACHE_MB;
 import static org.apache.jackrabbit.oak.segment.compaction.SegmentGCOptions.defaultGCOptions;
 import static org.apache.jackrabbit.oak.segment.file.FileStoreBuilder.fileStoreBuilder;
 
@@ -60,6 +61,8 @@
 
         private boolean force;
 
+        private int segmentCacheSize = DEFAULT_SEGMENT_CACHE_MB;
+
         private Builder() {
             // Prevent external instantiation.
         }
@@ -97,6 +100,11 @@
             return this;
         }
 
+        public Builder withSegmentCacheSize(int segmentCacheSize) {
+            this.segmentCacheSize = segmentCacheSize;
+            return this;
+        }
+
         /**
          * Create an executable version of the {@link Compact} command.
          *
@@ -114,11 +122,14 @@
     @CheckForNull
     private final Boolean mmap;
 
+    private final int segmentCacheSize;
+
     private final boolean strictVersionCheck;
 
     private Compact(Builder builder) {
         this.path = builder.path;
         this.mmap = builder.mmap;
+        this.segmentCacheSize = builder.segmentCacheSize;
         this.strictVersionCheck = !builder.force;
     }
 
@@ -157,6 +168,7 @@
     private FileStore newFileStore() throws IOException, InvalidFileStoreVersionException {
         FileStoreBuilder fileStoreBuilder = fileStoreBuilder(path.getAbsoluteFile())
                 .withStrictVersionCheck(strictVersionCheck)
+                .withSegmentCacheSize(segmentCacheSize)
                 .withGCOptions(defaultGCOptions()
                     .setOffline()
                     .setGCLogInterval(logAt));