org.apache.hadoop.hbase.ipc

Class NettyRpcServerChannelWritabilityHandler

java.lang.Object

org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerAdapter

org.apache.hbase.thirdparty.io.netty.channel.ChannelInboundHandlerAdapter

org.apache.hbase.thirdparty.io.netty.channel.ChannelDuplexHandler

org.apache.hadoop.hbase.ipc.NettyRpcServerChannelWritabilityHandler

All Implemented Interfaces:

org.apache.hbase.thirdparty.io.netty.channel.ChannelHandler, org.apache.hbase.thirdparty.io.netty.channel.ChannelInboundHandler, org.apache.hbase.thirdparty.io.netty.channel.ChannelOutboundHandler

@InterfaceAudience.Private
public class NettyRpcServerChannelWritabilityHandler
extends org.apache.hbase.thirdparty.io.netty.channel.ChannelDuplexHandler

Handler to enforce writability protections on our server channels:
- Responds to channel writability events, which are triggered when the total pending bytes for a channel passes configured high and low watermarks. When high watermark is exceeded, the channel is setAutoRead(false). This way, we won't accept new requests from the client until some pending outbound bytes are successfully received by the client.
- Pre-processes any channel write requests. If the total pending outbound bytes exceeds a fatal threshold, the channel is forcefully closed and the write is set to failed. This handler should be the last handler in the pipeline so that it's the first handler to receive any messages sent to channel.write() or channel.writeAndFlush().

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hbase.thirdparty.io.netty.channel.ChannelHandler

org.apache.hbase.thirdparty.io.netty.channel.ChannelHandler.Sharable

Method Summary

Modifier and Type	Method and Description
void	channelWritabilityChanged(org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext ctx)
void	write(org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext ctx, Object msg, org.apache.hbase.thirdparty.io.netty.channel.ChannelPromise promise)

Methods inherited from class org.apache.hbase.thirdparty.io.netty.channel.ChannelDuplexHandler

bind, close, connect, deregister, disconnect, flush, read

Methods inherited from class org.apache.hbase.thirdparty.io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelRead, channelReadComplete, channelRegistered, channelUnregistered, exceptionCaught, userEventTriggered

Methods inherited from class org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hbase.thirdparty.io.netty.channel.ChannelHandler

exceptionCaught, handlerAdded, handlerRemoved

Method Detail

write

public void write(org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext ctx,
                  Object msg,
                  org.apache.hbase.thirdparty.io.netty.channel.ChannelPromise promise)
           throws Exception

Specified by:

write in interface org.apache.hbase.thirdparty.io.netty.channel.ChannelOutboundHandler

Overrides:

write in class org.apache.hbase.thirdparty.io.netty.channel.ChannelDuplexHandler

Throws:

Exception

channelWritabilityChanged

public void channelWritabilityChanged(org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext ctx)
                               throws Exception

Specified by:

channelWritabilityChanged in interface org.apache.hbase.thirdparty.io.netty.channel.ChannelInboundHandler

Overrides:

channelWritabilityChanged in class org.apache.hbase.thirdparty.io.netty.channel.ChannelInboundHandlerAdapter

Throws:

Exception