Examples of org.apache.hadoop.hdfs.server.datanode.FSDataset.unlinkBlock()

Package org.apache.hadoop.hdfs.server.datanode

Class org.apache.hadoop.hdfs.server.datanode.FSDataset

Examples of org.apache.hadoop.hdfs.server.datanode.FSDataset.unlinkBlock()

org.apache.hadoop.hdfs.server.datanode.FSDataset.unlinkBlock()
Make a copy of the block if this block is linked to an existing snapshot. This ensures that modifying this block does not modify data in any existing snapshots. @param block Block @param numLinks Unlink if the number of links exceed this value @throws IOException @return - true if the specified block was unlinked or the blockis not in any snapshot.

      //
      for (int i = 0; i < blocks.size(); i++) {
        Block b = blocks.get(i).getBlock();
        System.out.println("testCopyOnWrite detaching block " + b);
        assertTrue("Detaching block " + b + " should have returned true",
            dataset.unlinkBlock(b, 1));
      }


      // Since the blocks were already detached earlier, these calls should
      // return false
      //

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      //
      for (int i = 0; i < blocks.size(); i++) {
        Block b = blocks.get(i).getBlock();
        System.out.println("testCopyOnWrite detaching block " + b);
        assertTrue("Detaching block " + b + " should have returned false",
            !dataset.unlinkBlock(b, 1));
      }


    } finally {
      fs.close();
      cluster.shutdown();

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      //
      for (int i = 0; i < blocks.size(); i++) {
        ExtendedBlock b = blocks.get(i).getBlock();
        System.out.println("testCopyOnWrite detaching block " + b);
        assertTrue("Detaching block " + b + " should have returned true",
            dataset.unlinkBlock(b, 1));
      }


      // Since the blocks were already detached earlier, these calls should
      // return false
      //

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      //
      for (int i = 0; i < blocks.size(); i++) {
        ExtendedBlock b = blocks.get(i).getBlock();
        System.out.println("testCopyOnWrite detaching block " + b);
        assertTrue("Detaching block " + b + " should have returned false",
            !dataset.unlinkBlock(b, 1));
      }


    } finally {
      fs.close();
      cluster.shutdown();

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      //
      for (int i = 0; i < blocks.size(); i++) {
        Block b = blocks.get(i).getBlock();
        System.out.println("testCopyOnWrite detaching block " + b);
        assertTrue("Detaching block " + b + " should have returned true",
            dataset.unlinkBlock(b, 1));
      }


      // Since the blocks were already detached earlier, these calls should
      // return false
      //

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      //
      for (int i = 0; i < blocks.size(); i++) {
        Block b = blocks.get(i).getBlock();
        System.out.println("testCopyOnWrite detaching block " + b);
        assertTrue("Detaching block " + b + " should have returned false",
            !dataset.unlinkBlock(b, 1));
      }


    } finally {
      fs.close();
      cluster.shutdown();

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