diff --git a/server/base/src/main/java/org/apache/accumulo/server/compaction/CompactionPluginUtils.java b/server/base/src/main/java/org/apache/accumulo/server/compaction/CompactionPluginUtils.java
index 6f7529948fe..7978d3c2e5f 100644
--- a/server/base/src/main/java/org/apache/accumulo/server/compaction/CompactionPluginUtils.java
+++ b/server/base/src/main/java/org/apache/accumulo/server/compaction/CompactionPluginUtils.java
@@ -18,6 +18,8 @@
  */
 package org.apache.accumulo.server.compaction;
 
+import java.io.IOException;
+import java.io.UncheckedIOException;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
@@ -34,6 +36,7 @@
 import org.apache.accumulo.core.client.admin.compaction.CompactableFile;
 import org.apache.accumulo.core.client.admin.compaction.CompactionConfigurer;
 import org.apache.accumulo.core.client.admin.compaction.CompactionSelector;
+import org.apache.accumulo.core.client.rfile.RFileSource;
 import org.apache.accumulo.core.client.sample.SamplerConfiguration;
 import org.apache.accumulo.core.client.summary.SummarizerConfiguration;
 import org.apache.accumulo.core.client.summary.Summary;
@@ -47,14 +50,23 @@
 import org.apache.accumulo.core.data.Value;
 import org.apache.accumulo.core.dataImpl.KeyExtent;
 import org.apache.accumulo.core.dataImpl.TabletIdImpl;
+import org.apache.accumulo.core.file.FileOperations;
 import org.apache.accumulo.core.iterators.SortedKeyValueIterator;
 import org.apache.accumulo.core.metadata.CompactableFileImpl;
 import org.apache.accumulo.core.metadata.StoredTabletFile;
 import org.apache.accumulo.core.metadata.schema.DataFileValue;
+import org.apache.accumulo.core.sample.impl.SamplerConfigurationImpl;
 import org.apache.accumulo.core.spi.common.ServiceEnvironment;
 import org.apache.accumulo.core.spi.compaction.CompactionDispatcher;
+import org.apache.accumulo.core.summary.Gatherer;
+import org.apache.accumulo.core.summary.SummarizerFactory;
+import org.apache.accumulo.core.summary.SummaryCollection;
+import org.apache.accumulo.core.summary.SummaryReader;
 import org.apache.accumulo.server.ServerContext;
 import org.apache.accumulo.server.ServiceEnvironmentImpl;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FileSystem;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -127,7 +139,32 @@ public Collection<CompactableFile> getAvailableFiles() {
           public Collection<Summary> getSummaries(Collection<CompactableFile> files,
               Predicate<SummarizerConfiguration> summarySelector) {
 
-            throw new UnsupportedOperationException();
+            // ELASTICITY_TODO this may open files for user tables in the manager, need to avoid
+            // this. See #3526
+
+            try {
+              var tableConf = context.getTableConfiguration(extent.tableId());
+
+              SummaryCollection sc = new SummaryCollection();
+              SummarizerFactory factory = new SummarizerFactory(tableConf);
+              for (CompactableFile cf : files) {
+                var file = CompactableFileImpl.toStoredTabletFile(cf);
+                FileSystem fs = context.getVolumeManager().getFileSystemByPath(file.getPath());
+                Configuration conf = context.getHadoopConf();
+                RFileSource source = new RFileSource(new FSDataInputStream(fs.open(file.getPath())),
+                    fs.getFileStatus(file.getPath()).getLen(), file.getRange());
+
+                SummaryCollection fsc = SummaryReader
+                    .load(conf, source, file.getFileName(), summarySelector, factory,
+                        tableConf.getCryptoService())
+                    .getSummaries(Collections.singletonList(new Gatherer.RowRange(extent)));
+
+                sc.merge(fsc, factory);
+              }
+              return sc.getSummaries();
+            } catch (IOException ioe) {
+              throw new UncheckedIOException(ioe);
+            }
           }
 
           @Override
@@ -141,9 +178,30 @@ public TabletId getTabletId() {
           }
 
           @Override
-          public Optional<SortedKeyValueIterator<Key,Value>> getSample(CompactableFile file,
+          public Optional<SortedKeyValueIterator<Key,Value>> getSample(CompactableFile cf,
               SamplerConfiguration sc) {
-            throw new UnsupportedOperationException();
+
+            // ELASTICITY_TODO this may open files for user tables in the manager, need to avoid
+            // this. See #3526
+
+            try {
+              var file = CompactableFileImpl.toStoredTabletFile(cf);
+              FileSystem fs = context.getVolumeManager().getFileSystemByPath(file.getPath());
+              Configuration conf = context.getHadoopConf();
+              var tableConf = context.getTableConfiguration(extent.tableId());
+              var iter = FileOperations.getInstance().newReaderBuilder()
+                  .forFile(file, fs, conf, tableConf.getCryptoService())
+                  .withTableConfiguration(tableConf).seekToBeginning().build();
+              var sampleIter = iter.getSample(new SamplerConfigurationImpl(sc));
+              if (sampleIter == null) {
+                iter.close();
+                return Optional.empty();
+              }
+
+              return Optional.of(sampleIter);
+            } catch (IOException ioe) {
+              throw new UncheckedIOException(ioe);
+            }
           }
         });