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dhuo pushed a commit to branch persistence-poc
in repository https://gitbox.apache.org/repos/asf/polaris.git

commit 54b762e985bc805200da0317de50aad51747279c
Author: Dennis Huo <[email protected]>
AuthorDate: Tue Feb 25 03:44:40 2025 +0000

    Remove all "entitiesDropped" members; these were vestigial from trying to 
implement UNDROP
    but for now are entirely unused. We can reintroduce it with a better design 
against multiple
    backends when/if we want to implement UNDROP.
---
 .../PolarisEclipseLinkMetaStoreSessionImpl.java    |  16 --
 .../impl/eclipselink/PolarisEclipseLinkStore.java  |  38 -----
 .../polaris/jpa/models/ModelEntityDropped.java     | 164 ---------------------
 .../persistence/PolarisMetaStoreManagerImpl.java   | 110 ++++++--------
 .../core/persistence/PolarisMetaStoreSession.java  |  20 ---
 .../PolarisTreeMapMetaStoreSessionImpl.java        |  18 ---
 .../core/persistence/PolarisTreeMapStore.java      |  49 +-----
 7 files changed, 46 insertions(+), 369 deletions(-)

diff --git 
a/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkMetaStoreSessionImpl.java
 
b/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkMetaStoreSessionImpl.java
index 04787d51..621993e7 100644
--- 
a/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkMetaStoreSessionImpl.java
+++ 
b/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkMetaStoreSessionImpl.java
@@ -271,14 +271,6 @@ public class PolarisEclipseLinkMetaStoreSessionImpl 
implements PolarisMetaStoreS
     this.store.writeToEntitiesActive(localSession.get(), entity);
   }
 
-  /** {@inheritDoc} */
-  @Override
-  public void writeToEntitiesDropped(
-      @Nonnull PolarisCallContext callCtx, @Nonnull PolarisBaseEntity entity) {
-    // write it
-    this.store.writeToEntitiesDropped(localSession.get(), entity);
-  }
-
   /** {@inheritDoc} */
   @Override
   public void writeToEntitiesChangeTracking(
@@ -312,14 +304,6 @@ public class PolarisEclipseLinkMetaStoreSessionImpl 
implements PolarisMetaStoreS
     this.store.deleteFromEntitiesActive(localSession.get(), new 
PolarisEntitiesActiveKey(entity));
   }
 
-  /** {@inheritDoc} */
-  @Override
-  public void deleteFromEntitiesDropped(
-      @Nonnull PolarisCallContext callCtx, @Nonnull PolarisBaseEntity entity) {
-    // delete it
-    this.store.deleteFromEntitiesDropped(localSession.get(), 
entity.getCatalogId(), entity.getId());
-  }
-
   /**
    * {@inheritDoc}
    *
diff --git 
a/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkStore.java
 
b/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkStore.java
index 8216bef9..59ac63f6 100644
--- 
a/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkStore.java
+++ 
b/extension/persistence/eclipselink/src/main/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisEclipseLinkStore.java
@@ -38,7 +38,6 @@ import org.apache.polaris.core.entity.PolarisPrincipalSecrets;
 import org.apache.polaris.jpa.models.ModelEntity;
 import org.apache.polaris.jpa.models.ModelEntityActive;
 import org.apache.polaris.jpa.models.ModelEntityChangeTracking;
-import org.apache.polaris.jpa.models.ModelEntityDropped;
 import org.apache.polaris.jpa.models.ModelGrantRecord;
 import org.apache.polaris.jpa.models.ModelPrincipalSecrets;
 import org.slf4j.Logger;
@@ -104,17 +103,6 @@ public class PolarisEclipseLinkStore {
     }
   }
 
-  void writeToEntitiesDropped(EntityManager session, PolarisBaseEntity entity) 
{
-    diagnosticServices.check(session != null, "session_is_null");
-    checkInitialized();
-
-    ModelEntityDropped entityDropped =
-        lookupEntityDropped(session, entity.getCatalogId(), entity.getId());
-    if (entityDropped == null) {
-      session.persist(ModelEntityDropped.fromEntity(entity));
-    }
-  }
-
   void writeToEntitiesChangeTracking(EntityManager session, PolarisBaseEntity 
entity) {
     diagnosticServices.check(session != null, "session_is_null");
     checkInitialized();
@@ -158,16 +146,6 @@ public class PolarisEclipseLinkStore {
     session.remove(entity);
   }
 
-  void deleteFromEntitiesDropped(EntityManager session, long catalogId, long 
entityId) {
-    diagnosticServices.check(session != null, "session_is_null");
-    checkInitialized();
-
-    ModelEntityDropped entity = lookupEntityDropped(session, catalogId, 
entityId);
-    diagnosticServices.check(entity != null, "dropped_entity_not_found");
-
-    session.remove(entity);
-  }
-
   void deleteFromEntitiesChangeTracking(EntityManager session, 
PolarisEntityCore entity) {
     diagnosticServices.check(session != null, "session_is_null");
     checkInitialized();
@@ -216,7 +194,6 @@ public class PolarisEclipseLinkStore {
 
     session.createQuery("DELETE from ModelEntity").executeUpdate();
     session.createQuery("DELETE from ModelEntityActive").executeUpdate();
-    session.createQuery("DELETE from ModelEntityDropped").executeUpdate();
     session.createQuery("DELETE from 
ModelEntityChangeTracking").executeUpdate();
     session.createQuery("DELETE from ModelGrantRecord").executeUpdate();
     session.createQuery("DELETE from ModelPrincipalSecrets").executeUpdate();
@@ -319,21 +296,6 @@ public class PolarisEclipseLinkStore {
     return query.getResultList();
   }
 
-  ModelEntityDropped lookupEntityDropped(EntityManager session, long 
catalogId, long entityId) {
-    diagnosticServices.check(session != null, "session_is_null");
-    checkInitialized();
-
-    return session
-        .createQuery(
-            "SELECT m from ModelEntityDropped m where m.catalogId=:catalogId 
and m.id=:id",
-            ModelEntityDropped.class)
-        .setParameter("catalogId", catalogId)
-        .setParameter("id", entityId)
-        .getResultStream()
-        .findFirst()
-        .orElse(null);
-  }
-
   ModelEntityChangeTracking lookupEntityChangeTracking(
       EntityManager session, long catalogId, long entityId) {
     diagnosticServices.check(session != null, "session_is_null");
diff --git 
a/extension/persistence/jpa-model/src/main/java/org/apache/polaris/jpa/models/ModelEntityDropped.java
 
b/extension/persistence/jpa-model/src/main/java/org/apache/polaris/jpa/models/ModelEntityDropped.java
deleted file mode 100644
index 97986e79..00000000
--- 
a/extension/persistence/jpa-model/src/main/java/org/apache/polaris/jpa/models/ModelEntityDropped.java
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.polaris.jpa.models;
-
-import jakarta.persistence.Entity;
-import jakarta.persistence.Id;
-import jakarta.persistence.Table;
-import jakarta.persistence.Version;
-import org.apache.polaris.core.entity.PolarisBaseEntity;
-
-/**
- * EntityDropped model representing some attributes of a Polaris Entity. This 
is used to exchange
- * entity information with ENTITIES_DROPPED table
- */
-@Entity
-@Table(name = "ENTITIES_DROPPED")
-public class ModelEntityDropped {
-  // the id of the catalog associated to that entity. NULL_ID if this entity 
is top-level like
-  // a catalog
-  @Id private long catalogId;
-
-  // the id of the entity which was resolved
-  private long id;
-
-  // the id of the parent of this entity, use 0 for a top-level entity whose 
parent is the account
-  @Id private long parentId;
-
-  // the type of the entity when it was resolved
-  @Id private int typeCode;
-
-  // the name that this entity had when it was resolved
-  @Id private String name;
-
-  // the type of the entity when it was resolved
-  @Id private int subTypeCode;
-
-  // when this entity was dropped. Null if was never dropped
-  @Id private long dropTimestamp;
-
-  // when should we start purging this entity
-  private long toPurgeTimestamp;
-
-  // Used for Optimistic Locking to handle concurrent reads and updates
-  @Version private long version;
-
-  public long getCatalogId() {
-    return catalogId;
-  }
-
-  public long getId() {
-    return id;
-  }
-
-  public long getParentId() {
-    return parentId;
-  }
-
-  public int getTypeCode() {
-    return typeCode;
-  }
-
-  public String getName() {
-    return name;
-  }
-
-  public int getSubTypeCode() {
-    return subTypeCode;
-  }
-
-  public long getDropTimestamp() {
-    return dropTimestamp;
-  }
-
-  public long getToPurgeTimestamp() {
-    return toPurgeTimestamp;
-  }
-
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  public static final class Builder {
-    private final ModelEntityDropped entity;
-
-    private Builder() {
-      entity = new ModelEntityDropped();
-    }
-
-    public Builder catalogId(long catalogId) {
-      entity.catalogId = catalogId;
-      return this;
-    }
-
-    public Builder id(long id) {
-      entity.id = id;
-      return this;
-    }
-
-    public Builder parentId(long parentId) {
-      entity.parentId = parentId;
-      return this;
-    }
-
-    public Builder typeCode(int typeCode) {
-      entity.typeCode = typeCode;
-      return this;
-    }
-
-    public Builder name(String name) {
-      entity.name = name;
-      return this;
-    }
-
-    public Builder subTypeCode(int subTypeCode) {
-      entity.subTypeCode = subTypeCode;
-      return this;
-    }
-
-    public Builder dropTimestamp(long dropTimestamp) {
-      entity.dropTimestamp = dropTimestamp;
-      return this;
-    }
-
-    public Builder toPurgeTimestamp(long toPurgeTimestamp) {
-      entity.toPurgeTimestamp = toPurgeTimestamp;
-      return this;
-    }
-
-    public ModelEntityDropped build() {
-      return entity;
-    }
-  }
-
-  public static ModelEntityDropped fromEntity(PolarisBaseEntity entity) {
-    if (entity == null) return null;
-
-    return ModelEntityDropped.builder()
-        .catalogId(entity.getCatalogId())
-        .id(entity.getId())
-        .parentId(entity.getParentId())
-        .typeCode(entity.getTypeCode())
-        .name(entity.getName())
-        .subTypeCode(entity.getSubTypeCode())
-        .dropTimestamp(entity.getDropTimestamp())
-        .toPurgeTimestamp(entity.getToPurgeTimestamp())
-        .build();
-  }
-}
diff --git 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreManagerImpl.java
 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreManagerImpl.java
index 6214d0f0..3eb32d07 100644
--- 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreManagerImpl.java
+++ 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreManagerImpl.java
@@ -69,9 +69,6 @@ public class PolarisMetaStoreManagerImpl extends 
BaseMetaStoreManager {
   /** mapper, allows to serialize/deserialize properties to/from JSON */
   private static final ObjectMapper MAPPER = new ObjectMapper();
 
-  /** use synchronous drop for entities */
-  private static final boolean USE_SYNCHRONOUS_DROP = true;
-
   /**
    * Lookup an entity by its name
    *
@@ -280,74 +277,53 @@ public class PolarisMetaStoreManagerImpl extends 
BaseMetaStoreManager {
     // delete it from active slice
     ms.deleteFromEntitiesActive(callCtx, entity);
 
-    // for now drop all entities synchronously
-    if (USE_SYNCHRONOUS_DROP) {
-      // use synchronous drop
-
-      // delete ALL grant records to (if the entity is a grantee) and from 
that entity
-      final List<PolarisGrantRecord> grantsOnGrantee =
-          (entity.getType().isGrantee())
-              ? ms.loadAllGrantRecordsOnGrantee(callCtx, 
entity.getCatalogId(), entity.getId())
-              : List.of();
-      final List<PolarisGrantRecord> grantsOnSecurable =
-          ms.loadAllGrantRecordsOnSecurable(callCtx, entity.getCatalogId(), 
entity.getId());
-      ms.deleteAllEntityGrantRecords(callCtx, entity, grantsOnGrantee, 
grantsOnSecurable);
-
-      // Now determine the set of entities on the other side of the grants we 
just removed. Grants
-      // from/to these entities has been removed, hence we need to update the 
grant version of
-      // each entity. Collect the id of each.
-      Set<PolarisEntityId> entityIdsGrantChanged = new HashSet<>();
-      grantsOnGrantee.forEach(
-          gr ->
-              entityIdsGrantChanged.add(
-                  new PolarisEntityId(gr.getSecurableCatalogId(), 
gr.getSecurableId())));
-      grantsOnSecurable.forEach(
-          gr ->
-              entityIdsGrantChanged.add(
-                  new PolarisEntityId(gr.getGranteeCatalogId(), 
gr.getGranteeId())));
-
-      // Bump up the grant version of these entities
-      List<PolarisBaseEntity> entities =
-          ms.lookupEntities(callCtx, new ArrayList<>(entityIdsGrantChanged));
-      for (PolarisBaseEntity entityGrantChanged : entities) {
-        
entityGrantChanged.setGrantRecordsVersion(entityGrantChanged.getGrantRecordsVersion()
 + 1);
-        ms.writeToEntities(callCtx, entityGrantChanged);
-        ms.writeToEntitiesChangeTracking(callCtx, entityGrantChanged);
-      }
-
-      // remove the entity being dropped now
-      ms.deleteFromEntities(callCtx, entity);
-      ms.deleteFromEntitiesChangeTracking(callCtx, entity);
-
-      // if it is a principal, we also need to drop the secrets
-      if (entity.getType() == PolarisEntityType.PRINCIPAL) {
-        // get internal properties
-        Map<String, String> properties =
-            this.deserializeProperties(callCtx, 
entity.getInternalProperties());
-
-        // get client_id
-        String clientId = 
properties.get(PolarisEntityConstants.getClientIdPropertyName());
-
-        // delete it from the secret slice
-        ms.deletePrincipalSecrets(callCtx, clientId, entity.getId());
-      }
-    } else {
+    // for now drop all associated grants, etc. synchronously
+    // delete ALL grant records to (if the entity is a grantee) and from that 
entity
+    final List<PolarisGrantRecord> grantsOnGrantee =
+        (entity.getType().isGrantee())
+            ? ms.loadAllGrantRecordsOnGrantee(callCtx, entity.getCatalogId(), 
entity.getId())
+            : List.of();
+    final List<PolarisGrantRecord> grantsOnSecurable =
+        ms.loadAllGrantRecordsOnSecurable(callCtx, entity.getCatalogId(), 
entity.getId());
+    ms.deleteAllEntityGrantRecords(callCtx, entity, grantsOnGrantee, 
grantsOnSecurable);
+
+    // Now determine the set of entities on the other side of the grants we 
just removed. Grants
+    // from/to these entities has been removed, hence we need to update the 
grant version of
+    // each entity. Collect the id of each.
+    Set<PolarisEntityId> entityIdsGrantChanged = new HashSet<>();
+    grantsOnGrantee.forEach(
+        gr ->
+            entityIdsGrantChanged.add(
+                new PolarisEntityId(gr.getSecurableCatalogId(), 
gr.getSecurableId())));
+    grantsOnSecurable.forEach(
+        gr ->
+            entityIdsGrantChanged.add(
+                new PolarisEntityId(gr.getGranteeCatalogId(), 
gr.getGranteeId())));
+
+    // Bump up the grant version of these entities
+    List<PolarisBaseEntity> entities =
+        ms.lookupEntities(callCtx, new ArrayList<>(entityIdsGrantChanged));
+    for (PolarisBaseEntity entityGrantChanged : entities) {
+      
entityGrantChanged.setGrantRecordsVersion(entityGrantChanged.getGrantRecordsVersion()
 + 1);
+      ms.writeToEntities(callCtx, entityGrantChanged);
+      ms.writeToEntitiesChangeTracking(callCtx, entityGrantChanged);
+    }
 
-      // update the entity to indicate it has been dropped
-      final long now = System.currentTimeMillis();
-      entity.setDropTimestamp(now);
-      entity.setLastUpdateTimestamp(now);
+    // remove the entity being dropped now
+    ms.deleteFromEntities(callCtx, entity);
+    ms.deleteFromEntitiesChangeTracking(callCtx, entity);
 
-      // schedule purge
-      entity.setToPurgeTimestamp(now + 
PolarisEntityConstants.getRetentionTimeInMs());
+    // if it is a principal, we also need to drop the secrets
+    if (entity.getType() == PolarisEntityType.PRINCIPAL) {
+      // get internal properties
+      Map<String, String> properties =
+          this.deserializeProperties(callCtx, entity.getInternalProperties());
 
-      // increment version
-      entity.setEntityVersion(entity.getEntityVersion() + 1);
+      // get client_id
+      String clientId = 
properties.get(PolarisEntityConstants.getClientIdPropertyName());
 
-      // write to the dropped slice and to purge slice
-      ms.writeToEntities(callCtx, entity);
-      ms.writeToEntitiesDropped(callCtx, entity);
-      ms.writeToEntitiesChangeTracking(callCtx, entity);
+      // delete it from the secret slice
+      ms.deletePrincipalSecrets(callCtx, clientId, entity.getId());
     }
   }
 
diff --git 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreSession.java
 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreSession.java
index 124ec1d7..ee1d4f19 100644
--- 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreSession.java
+++ 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisMetaStoreSession.java
@@ -122,17 +122,6 @@ public interface PolarisMetaStoreSession {
   void writeToEntitiesActive(
       @Nonnull PolarisCallContext callCtx, @Nonnull PolarisBaseEntity entity);
 
-  /**
-   * Write the base entity to the entities_dropped table. If there is a 
conflict (existing record
-   * with the same PK), all attributes of the new record will replace the 
existing one.
-   *
-   * @param callCtx call context
-   * @param entity entity record to write, potentially replacing an existing 
entity record with the
-   *     same key
-   */
-  void writeToEntitiesDropped(
-      @Nonnull PolarisCallContext callCtx, @Nonnull PolarisBaseEntity entity);
-
   /**
    * Write the base entity to the entities change tracking table. If there is 
a conflict (existing
    * record with the same id), all attributes of the new record will replace 
the existing one.
@@ -172,15 +161,6 @@ public interface PolarisMetaStoreSession {
   void deleteFromEntitiesActive(
       @Nonnull PolarisCallContext callCtx, @Nonnull PolarisEntityCore entity);
 
-  /**
-   * Delete the base entity to the entities_dropped table
-   *
-   * @param callCtx call context
-   * @param entity entity record to delete
-   */
-  void deleteFromEntitiesDropped(
-      @Nonnull PolarisCallContext callCtx, @Nonnull PolarisBaseEntity entity);
-
   /**
    * Delete the base entity from the entities change tracking table
    *
diff --git 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapMetaStoreSessionImpl.java
 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapMetaStoreSessionImpl.java
index 6516b7b7..536e81c7 100644
--- 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapMetaStoreSessionImpl.java
+++ 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapMetaStoreSessionImpl.java
@@ -126,15 +126,6 @@ public class PolarisTreeMapMetaStoreSessionImpl implements 
PolarisMetaStoreSessi
     this.store.getSliceEntitiesActive().write(entity);
   }
 
-  /** {@inheritDoc} */
-  @Override
-  public void writeToEntitiesDropped(
-      @Nonnull PolarisCallContext callCtx, @Nonnull PolarisBaseEntity entity) {
-    // write it
-    this.store.getSliceEntitiesDropped().write(entity);
-    this.store.getSliceEntitiesDroppedToPurge().write(entity);
-  }
-
   /** {@inheritDoc} */
   @Override
   public void writeToEntitiesChangeTracking(
@@ -169,15 +160,6 @@ public class PolarisTreeMapMetaStoreSessionImpl implements 
PolarisMetaStoreSessi
     
this.store.getSliceEntitiesActive().delete(this.store.buildEntitiesActiveKey(entity));
   }
 
-  /** {@inheritDoc} */
-  @Override
-  public void deleteFromEntitiesDropped(
-      @Nonnull PolarisCallContext callCtx, @Nonnull PolarisBaseEntity entity) {
-    // delete it
-    this.store.getSliceEntitiesDropped().delete(entity);
-    this.store.getSliceEntitiesDroppedToPurge().delete(entity);
-  }
-
   /**
    * {@inheritDoc}
    *
diff --git 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapStore.java
 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapStore.java
index 544bcf0f..3d5f3d7f 100644
--- 
a/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapStore.java
+++ 
b/polaris-core/src/main/java/org/apache/polaris/core/persistence/PolarisTreeMapStore.java
@@ -194,16 +194,10 @@ public class PolarisTreeMapStore {
   // all entities
   private final Slice<PolarisBaseEntity> sliceEntities;
 
-  // all entities
+  // all entities by-name
   private final Slice<PolarisBaseEntity> sliceEntitiesActive;
 
-  // all entities dropped
-  private final Slice<PolarisBaseEntity> sliceEntitiesDropped;
-
-  // all entities dropped
-  private final Slice<PolarisBaseEntity> sliceEntitiesDroppedToPurge;
-
-  // all entities dropped
+  // all entities just holding their entityVersions and grantVersions
   private final Slice<PolarisBaseEntity> sliceEntitiesChangeTracking;
 
   // all grant records indexed by securable
@@ -231,32 +225,9 @@ public class PolarisTreeMapStore {
             entity -> String.format("%d::%d", entity.getCatalogId(), 
entity.getId()),
             PolarisBaseEntity::new);
 
-    // the entities active slice
+    // the entities active slice; simply acts as a name-based index into the 
entities slice
     this.sliceEntitiesActive = new Slice<>(this::buildEntitiesActiveKey, 
PolarisBaseEntity::new);
 
-    // the entities active slice
-    this.sliceEntitiesDropped =
-        new Slice<>(
-            entity ->
-                String.format(
-                    "%d::%d::%s::%d::%d::%d",
-                    entity.getCatalogId(),
-                    entity.getParentId(),
-                    entity.getName(),
-                    entity.getTypeCode(),
-                    entity.getSubTypeCode(),
-                    entity.getDropTimestamp()),
-            PolarisBaseEntity::new);
-
-    // the entities active slice
-    this.sliceEntitiesDroppedToPurge =
-        new Slice<>(
-            entity ->
-                String.format(
-                    "%d::%d::%s",
-                    entity.getToPurgeTimestamp(), entity.getCatalogId(), 
entity.getId()),
-            PolarisBaseEntity::new);
-
     // change tracking
     this.sliceEntitiesChangeTracking =
         new Slice<>(
@@ -370,8 +341,6 @@ public class PolarisTreeMapStore {
     this.tr = new Transaction(true);
     this.sliceEntities.startWriteTransaction();
     this.sliceEntitiesActive.startWriteTransaction();
-    this.sliceEntitiesDropped.startWriteTransaction();
-    this.sliceEntitiesDroppedToPurge.startWriteTransaction();
     this.sliceEntitiesChangeTracking.startWriteTransaction();
     this.sliceGrantRecords.startWriteTransaction();
     this.sliceGrantRecordsByGrantee.startWriteTransaction();
@@ -382,8 +351,6 @@ public class PolarisTreeMapStore {
   void rollback() {
     this.sliceEntities.rollback();
     this.sliceEntitiesActive.rollback();
-    this.sliceEntitiesDropped.rollback();
-    this.sliceEntitiesDroppedToPurge.rollback();
     this.sliceEntitiesChangeTracking.rollback();
     this.sliceGrantRecords.rollback();
     this.sliceGrantRecordsByGrantee.rollback();
@@ -510,14 +477,6 @@ public class PolarisTreeMapStore {
     return sliceEntitiesActive;
   }
 
-  public Slice<PolarisBaseEntity> getSliceEntitiesDropped() {
-    return sliceEntitiesDropped;
-  }
-
-  public Slice<PolarisBaseEntity> getSliceEntitiesDroppedToPurge() {
-    return sliceEntitiesDroppedToPurge;
-  }
-
   public Slice<PolarisBaseEntity> getSliceEntitiesChangeTracking() {
     return sliceEntitiesChangeTracking;
   }
@@ -548,8 +507,6 @@ public class PolarisTreeMapStore {
     this.ensureReadWriteTr();
     this.sliceEntities.deleteAll();
     this.sliceEntitiesActive.deleteAll();
-    this.sliceEntitiesDropped.deleteAll();
-    this.sliceEntitiesDroppedToPurge.deleteAll();
     this.sliceEntitiesChangeTracking.deleteAll();
     this.sliceGrantRecordsByGrantee.deleteAll();
     this.sliceGrantRecords.deleteAll();

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