org.apache.hadoop.hbase.mob

Class MobCell

java.lang.Object

org.apache.hadoop.hbase.mob.MobCell

All Implemented Interfaces:

Closeable, AutoCloseable

@InterfaceAudience.Private
public class MobCell
extends Object
implements Closeable

The MobCell will maintain a Cell and a StoreFileScanner inside. Now, the mob cell is backend by NIO ByteBuffers which are allocated from ByteBuffAllocator, so we cannot just read the cell and close the MOB file scanner because the MOB file scanner closing will deallocate the NIO ByteBuffers, which resulting memory leak.

Actually, the right solution is:
1. Read the normal cell;
2. Parse the value of normal cell and get MOB fileName,offset,length;
3. Open scanner to read the mob value;
4. Construct the response cell whose key is from the normal cell and value is from the mob cell.
5. Ship the response cell to HBase client.
6. Release both normal cell's block and mob cell's block.

For mob cell, the block releasing just means closing the the mob scanner, so here we need to keep the StoreFileScanner inside and close only when we're ensure that the MobCell has been shipped to RPC client.

Constructor Summary

Constructors

Constructor and Description
MobCell(Cell cell)
MobCell(Cell cell, StoreFileScanner sfScanner)

Method Summary

Modifier and Type	Method and Description
void	close()
Cell	getCell()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MobCell

public MobCell(Cell cell)

MobCell

public MobCell(Cell cell,
               StoreFileScanner sfScanner)

Method Detail

getCell

public Cell getCell()

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException