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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.db;
  
  import org.junit.Test;
  
  import org.apache.cassandra.Util;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.cql3.UntypedResultSet;
  import org.apache.cassandra.io.filesystem.ListenableFileSystem;
  import org.apache.cassandra.io.sstable.CorruptSSTableException;
  import org.apache.cassandra.io.sstable.Descriptor;
  import org.apache.cassandra.io.sstable.format.big.BigFormat;
  import org.apache.cassandra.io.sstable.format.bti.BtiFormat;
  import org.apache.cassandra.io.util.File;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  
  public class CorruptPrimaryIndexTest extends CQLTester.InMemory
  {
      protected ListenableFileSystem.PathFilter isCurrentTableIndexFile(String keyspace, String endsWith)
      {
          return path -> {
              if (!path.getFileName().toString().endsWith(endsWith))
                  return false;
              Descriptor desc = Descriptor.fromFile(new File(path));
              if (!desc.ksname.equals(keyspace) || !desc.cfname.equals(currentTable()))
                  return false;
              return true;
          };
      }
  
      @Test
      public void bigPrimaryIndexDoesNotDetectDiskCorruption()
      {
          // Set listener early, before the file is opened; mmap access can not be listened to, so need to observe the open, which happens on flush
          if (BigFormat.isSelected())
          {
              fs.onPostRead(isCurrentTableIndexFile(keyspace(), "Index.db"), (path, channel, position, dst, read) -> {
                  // Reading the Primary index for the test!
                  // format
                  // 2 bytes: length of bytes for PK
                  // 4 bytes: pk as an int32
                  // variable bytes (see org.apache.cassandra.io.sstable.format.big.RowIndexEntry.IndexSerializer.deserialize(org.apache.cassandra.io.util.FileDataInput))
                  assertThat(position).describedAs("Unexpected access, should start read from start of file").isEqualTo(0);
  
                  // simulate bit rot by having 1 byte change... but make sure it's the pk!
                  dst.put(2, Byte.MAX_VALUE);
              });
          }
          else if (BtiFormat.isSelected())
          {
              fs.onPostRead(isCurrentTableIndexFile(keyspace(), "Partitions.db"), (path, channel, position, dst, read) -> {
                  // simulate bit rot by having 1 byte change...
                  // first read should be in the footer -- give it an invalid root position
                  // TODO: Change this to modify something in a more undetectable position in the file when checksumming is implemented
                  dst.put(2, Byte.MAX_VALUE);
              });
          }
          else
              throw Util.testMustBeImplementedForSSTableFormat();
  
          createTable("CREATE TABLE %s (id int PRIMARY KEY, value int)");
          execute("INSERT INTO %s (id, value) VALUES (?, ?)", 0, 0);
          flush();
  
          if (BigFormat.isSelected())
          {
              UntypedResultSet rs = execute("SELECT * FROM %s WHERE id=?", 0);
              // this assert check is here to get the test to be green... if the format is fixed and this data loss is not
              // happening anymore, then this check should be updated
              assertThatThrownBy(() -> assertRows(rs, row(0, 0))).hasMessage("Got less rows than expected. Expected 1 but got 0");
          }
          else
          {
              assertThatThrownBy(() -> execute("SELECT * FROM %s WHERE id=?", 0)).isInstanceOf(CorruptSSTableException.class);
          }
      }
  }
  