org.apache.hadoop.hbase.codec.prefixtree.encode
Class ThreadLocalEncoderPool

java.lang.Object
  org.apache.hadoop.hbase.codec.prefixtree.encode.ThreadLocalEncoderPool

All Implemented Interfaces:

EncoderPool

@InterfaceAudience.Private
public class ThreadLocalEncoderPool
extends Object
implements EncoderPool

Pool to enable reusing the Encoder objects which can consist of thousands of smaller objects and would be more garbage than the data in the block. A new encoder is needed for each block in a flush, compaction, RPC response, etc. It is not a pool in the traditional sense, but implements the semantics of a traditional pool via ThreadLocals to avoid sharing between threads. Sharing between threads would not be very expensive given that it's accessed per-block, but this is just as easy. This pool implementation assumes there is a one-to-one mapping between a single thread and a single flush or compaction.

Constructor Summary

ThreadLocalEncoderPool()

Method Summary

void	checkIn(PrefixTreeEncoder encoder)
PrefixTreeEncoder	checkOut(OutputStream os, boolean includeMvccVersion) Get the encoder attached to the current ThreadLocal, or create a new one and attach it to the current thread.

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadLocalEncoderPool

public ThreadLocalEncoderPool()

Method Detail

checkOut

public PrefixTreeEncoder checkOut(OutputStream os,
                                  boolean includeMvccVersion)

Get the encoder attached to the current ThreadLocal, or create a new one and attach it to the current thread.

Specified by:

checkOut in interface EncoderPool

checkIn

public void checkIn(PrefixTreeEncoder encoder)

Specified by:

checkIn in interface EncoderPool