saintstack commented on a change in pull request #14: HBASE-22843 [HBCK2] Fix 
HBCK2 after HBASE-22777 & HBASE-22758
URL: 
https://github.com/apache/hbase-operator-tools/pull/14#discussion_r314440327
 
 

 ##########
 File path: 
hbase-hbck2/src/main/java/org/apache/hbase/HBCKMetaTableAccessor.java
 ##########
 @@ -0,0 +1,133 @@
+/*
+ * 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.hbase;
+
+import org.apache.hadoop.hbase.Cell;
+import org.apache.hadoop.hbase.CellUtil;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.Connection;
+import org.apache.hadoop.hbase.client.Delete;
+import org.apache.hadoop.hbase.client.RegionInfo;
+import org.apache.hadoop.hbase.client.Table;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * hbck's local version of the MetaTableAccessor from the hbase repo
+ */
+@InterfaceAudience.Private
+public class HBCKMetaTableAccessor {
+
+  private static final Logger LOG = LoggerFactory.getLogger(
+      HBCKMetaTableAccessor.class);
+
+  // Constants
+  private static final byte[] MERGE_QUALIFIER_PREFIX = Bytes.toBytes("merge");
+
+  public static List<RegionInfo> getMergeRegions(Cell[] cells) {
+    if (cells == null) {
+      return null;
+    }
+    List<RegionInfo> regionsToMerge = null;
+    for (Cell cell : cells) {
+      if (!isMergeQualifierPrefix(cell)) {
+        continue;
+      }
+      // Ok. This cell is that of a info:merge* column.
+      RegionInfo ri = RegionInfo
+          .parseFromOrNull(cell.getValueArray(), cell.getValueOffset(), 
cell.getValueLength());
+      if (ri != null) {
+        if (regionsToMerge == null) {
+          regionsToMerge = new ArrayList<>();
+        }
+        regionsToMerge.add(ri);
+      }
+    }
+    return regionsToMerge;
+  }
+
+  /**
+   * Delete the passed <code>RegionInfo</code> from the 
<code>hbase:meta</code> table.
+   *
+   * @param connection connection we're using
+   * @param regionInfo the regionInfo to delete from the meta table
+   * @throws IOException
+   */
+  public static void deleteRegionInfo(Connection connection, RegionInfo 
regionInfo)
+      throws IOException {
+    Delete delete = new Delete(regionInfo.getRegionName());
+    delete.addFamily(HConstants.CATALOG_FAMILY, HConstants.LATEST_TIMESTAMP);
+    deleteFromMetaTable(connection, delete);
+    LOG.info("Deleted {}", regionInfo.getRegionNameAsString());
+  }
+
+  // Private helper methods
+
+  // COPIED from MetaTableAccessor.isMergeQualifierPrefix()
+  private static boolean isMergeQualifierPrefix(Cell cell) {
+    // Check to see if has family and that qualifier starts with the 
MERGE_QUALIFIER_PREFIX
+    return CellUtil.matchingFamily(cell, HConstants.CATALOG_FAMILY) && 
qualifierStartsWith(cell,
+        MERGE_QUALIFIER_PREFIX);
+  }
+
+  /**
+   * Finds if the start of the qualifier part of the Cell matches 'startsWith'
+   *
+   * COPIED from PrivateCellUtil.qualifierStartsWith()
+   * @param left       the cell with which we need to match the qualifier
+   * @param startsWith the serialized keyvalue format byte[]
+   * @return true if the qualifier have same staring characters, false 
otherwise
+   */
+  private static boolean qualifierStartsWith(final Cell left, final byte[] 
startsWith) {
+    if (startsWith == null || startsWith.length == 0) {
+      throw new IllegalArgumentException("Cannot pass an empty startsWith");
+    }
+    return Bytes
+        .equals(left.getQualifierArray(), left.getQualifierOffset(), 
startsWith.length, startsWith,
 
 Review comment:
   This does copy if ByteBuffer backed? Just wondering.

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