diff --git a/core/src/main/java/org/apache/druid/timeline/DataSegmentUtils.java b/core/src/main/java/org/apache/druid/timeline/DataSegmentUtils.java
index 7966991a531..150e09b0854 100644
--- a/core/src/main/java/org/apache/druid/timeline/DataSegmentUtils.java
+++ b/core/src/main/java/org/apache/druid/timeline/DataSegmentUtils.java
@@ -28,7 +28,9 @@ import org.apache.druid.java.util.common.logger.Logger;
 import org.joda.time.DateTime;
 import org.joda.time.Interval;
 
+import java.util.Collection;
 import java.util.Objects;
+import java.util.stream.Collectors;
 
 @PublicApi
 public class DataSegmentUtils
@@ -108,6 +110,16 @@ public class DataSegmentUtils
     return segmentDesc.withInterval(newInterval).toString();
   }
 
+  /**
+   * Creates a comma delimited list of segment identifiers
+   * @param segments
+   * @return
+   */
+  public static String getIdentifiersString(Collection<DataSegment> segments)
+  {
+    return segments.stream().map(DataSegment::getIdentifier).collect(Collectors.joining(", "));
+  }
+
   public static class SegmentIdentifierParts
   {
     private final String dataSource;
diff --git a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentInsertAction.java b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentInsertAction.java
index 42f74e59737..68a30b679af 100644
--- a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentInsertAction.java
+++ b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentInsertAction.java
@@ -25,9 +25,9 @@ import com.fasterxml.jackson.core.type.TypeReference;
 import com.google.common.collect.ImmutableSet;
 import org.apache.druid.indexing.common.task.Task;
 import org.apache.druid.timeline.DataSegment;
+import org.apache.druid.timeline.DataSegmentUtils;
 
 import java.util.Set;
-import java.util.stream.Collectors;
 
 /**
  * Insert segments into metadata storage. The segment versions must all be less than or equal to a lock held by
@@ -84,7 +84,7 @@ public class SegmentInsertAction implements TaskAction<Set<DataSegment>>
   public String toString()
   {
     return "SegmentInsertAction{" +
-           "segments=" + segments.stream().map(DataSegment::getIdentifier).collect(Collectors.joining(",")) +
+           "segments=" + DataSegmentUtils.getIdentifiersString(segments) +
            '}';
   }
 }
diff --git a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentMetadataUpdateAction.java b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentMetadataUpdateAction.java
index 4bb70a533d8..761c7586a7a 100644
--- a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentMetadataUpdateAction.java
+++ b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentMetadataUpdateAction.java
@@ -31,6 +31,7 @@ import org.apache.druid.java.util.common.ISE;
 import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;
 import org.apache.druid.query.DruidMetrics;
 import org.apache.druid.timeline.DataSegment;
+import org.apache.druid.timeline.DataSegmentUtils;
 import org.joda.time.Interval;
 
 import java.util.List;
@@ -114,7 +115,7 @@ public class SegmentMetadataUpdateAction implements TaskAction<Void>
   public String toString()
   {
     return "SegmentMetadataUpdateAction{" +
-           "segments=" + segments.stream().map(DataSegment::getIdentifier).collect(Collectors.joining(",")) +
+           "segments=" + DataSegmentUtils.getIdentifiersString(segments) +
            '}';
   }
 }
diff --git a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentNukeAction.java b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentNukeAction.java
index db632a78507..31a65d0f357 100644
--- a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentNukeAction.java
+++ b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentNukeAction.java
@@ -31,6 +31,7 @@ import org.apache.druid.java.util.common.ISE;
 import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;
 import org.apache.druid.query.DruidMetrics;
 import org.apache.druid.timeline.DataSegment;
+import org.apache.druid.timeline.DataSegmentUtils;
 import org.joda.time.Interval;
 
 import java.util.List;
@@ -116,7 +117,7 @@ public class SegmentNukeAction implements TaskAction<Void>
   public String toString()
   {
     return "SegmentNukeAction{" +
-           "segments=" + segments.stream().map(DataSegment::getIdentifier).collect(Collectors.joining(",")) +
+           "segments=" + DataSegmentUtils.getIdentifiersString(segments) +
            '}';
   }
 }
diff --git a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentTransactionalInsertAction.java b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentTransactionalInsertAction.java
index 3d733f90eff..01e3db7e0f3 100644
--- a/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentTransactionalInsertAction.java
+++ b/indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentTransactionalInsertAction.java
@@ -31,6 +31,7 @@ import org.apache.druid.indexing.overlord.SegmentPublishResult;
 import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;
 import org.apache.druid.query.DruidMetrics;
 import org.apache.druid.timeline.DataSegment;
+import org.apache.druid.timeline.DataSegmentUtils;
 
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -154,7 +155,7 @@ public class SegmentTransactionalInsertAction implements TaskAction<SegmentPubli
   public String toString()
   {
     return "SegmentInsertAction{" +
-           "segments=" + segments.stream().map(DataSegment::getIdentifier).collect(Collectors.joining(",")) +
+           "segments=" + DataSegmentUtils.getIdentifiersString(segments) +
            ", startMetadata=" + startMetadata +
            ", endMetadata=" + endMetadata +
            '}';
diff --git a/processing/src/main/java/org/apache/druid/segment/IndexMerger.java b/processing/src/main/java/org/apache/druid/segment/IndexMerger.java
index 87466d255e3..2826b9d4725 100644
--- a/processing/src/main/java/org/apache/druid/segment/IndexMerger.java
+++ b/processing/src/main/java/org/apache/druid/segment/IndexMerger.java
@@ -493,7 +493,7 @@ public interface IndexMerger
         mergeBufferTotalSize += bufferAllocation.rhs;
         ByteBufferUtils.free(bufferAllocation.lhs);
       }
-      log.info("Freed [,%d] bytes of dictionary merging direct buffers", mergeBufferTotalSize);
+      log.info("Freed [%,d] bytes of dictionary merging direct buffers", mergeBufferTotalSize);
     }
   }
 }
diff --git a/server/src/main/java/org/apache/druid/server/coordinator/helper/DruidCoordinatorSegmentCompactor.java b/server/src/main/java/org/apache/druid/server/coordinator/helper/DruidCoordinatorSegmentCompactor.java
index 4067b3a7a5d..82be5c4458d 100644
--- a/server/src/main/java/org/apache/druid/server/coordinator/helper/DruidCoordinatorSegmentCompactor.java
+++ b/server/src/main/java/org/apache/druid/server/coordinator/helper/DruidCoordinatorSegmentCompactor.java
@@ -30,6 +30,7 @@ import org.apache.druid.server.coordinator.CoordinatorStats;
 import org.apache.druid.server.coordinator.DataSourceCompactionConfig;
 import org.apache.druid.server.coordinator.DruidCoordinatorRuntimeParams;
 import org.apache.druid.timeline.DataSegment;
+import org.apache.druid.timeline.DataSegmentUtils;
 import org.apache.druid.timeline.VersionedIntervalTimeline;
 
 import javax.annotation.Nullable;
@@ -163,7 +164,7 @@ public class DruidCoordinatorSegmentCompactor implements DruidCoordinatorHelper
         LOG.info(
             "Submitted a compactTask[%s] for segments[%s]",
             taskId,
-            segmentsToCompact.stream().map(DataSegment::getIdentifier).collect(Collectors.joining(","))
+            DataSegmentUtils.getIdentifiersString(segmentsToCompact)
         );
       } else if (segmentsToCompact.size() == 1) {
         throw new ISE("Found one segments[%s] to compact", segmentsToCompact);