Apache Traffic Server 6.0.0 发布
欢迎加入运维网交流群:263444886Apache Traffic Server 6.0.0 发布，此版本现已提供下载：
http://trafficserver.apache.org/downloads
当从 5.x 升级至 6.0 版本时，需要重新编译用户编写的插件。如果从 3.2.0+ 版本升级至 v6.0.0，清闲保存好缓存，详细升级指导请看：https://cwiki.apache.org/confluence/display/TS/Upgrading+to+v6.0
这是第二个支持 HTTP/2 的版本，现在已经趋于稳定。此版本不再支持 RHEL5。
主要改进如下：
日志记录组件
[*] 应用协议 (HTTP/2, HTTP/1, SPDY/3.1), with %.
[*] Milestones/state times of a transactions to get a better understanding of where time for responses is spent.
[*] SSL session 攻击或者丢失
[*] 连接复用或者请求新连接
Wiretracing TLS
[*] Ability to wire trace and log TLS connections. See "New Configuration Options" below.
PCRE Jit
[*] Addedsupport for PCRE Jit for regex_map. Automatically used when compiled on a system that supports it. There is a speed improvement over normal PCRE matching.
将废弃的特性
[*]
traffic_line command line program will be removed in the 7.0.0>
[*]
SPDY support will be removed in the 7.0.0>
新配置选项
[*] proxy.config.cop.init_sleep_time
[*] proxy.config.http.websocket.max_number_of_connections
[*] proxy.config.net.max_connections_active_in
[*] proxy.config.http.max_post_size
[*] proxy.config.http.cache.generation
[*] proxy.config.http.cache.open_write_fail_action
[*] proxy.config.net.inactivity_check_frequency
[*] proxy.config.net.event_period
[*] proxy.config.net.accept_period
[*] proxy.config.net.retry_delay
[*] proxy.config.net.throttle_delay
[*] proxy.config.cache.read_while_writer.max_retries
[*] proxy.config.cache.read_while_writer_retry.delay
[*] proxy.config.log.periodic_tasks_interval
[*] proxy.config.ssl.handshake_timeout_in
[*] proxy.config.ssl.wire_trace_enabled
[*] proxy.config.ssl.wire_trace_addrproxy.config.ssl.wire_trace_percentage
[*] proxy.config.ssl.wire_trace_server_name
[*] proxy.config.http2.accept_no_activity_timeout
[*] proxy.config.http2.no_activity_timeout_in
[*] proxy.config.allocator.hugepages
新指标
[*] HTTP/2 Metrics
[*] proxy.process.http2.total_client_streams
[*] proxy.process.http2.total_transactions_time
[*] proxy.process.http2.total_client_connections
[*] proxy.process.http2.connection_errors
[*] proxy.process.http2.stream_errors
[*] proxy.process.http2.current_client_sessions
[*] proxy.process.http2.current_client_streams
新插件（实验性）
[*] stream_editor - Plugins for modifying the content of a response using a string or regular expression substitution
[*] mp4 - Allows for starting at the offset of a mp4 video stream
[*] cache_promote - Give better granularity on when an object is allowed to be written into the cache.
更多改进内容请看：https://cwiki.apache.org/confluence/display/TS/What%27s+New+in+v6.0.x
JIRAs：https://issues.apache.org/jira/secure/ReleaseNote.jspa?version=12324897&styleName=&projectId=12310963
Traffic Server 是一套快速、模块化的兼容 HTTP/1.1 的反向代理服务器，与 Nginx 和 Squid 类似，目前该项目已经转到 Apache 基金会。
Traffic Server设计的思想是将一个大系统划分为若干个小的子系统，每个子系统负责专门的任务或应用。比如，Event子系统负责提供任务调度服务，Net子系统负责提供网络服务。每个子系统抽象为一个Processor，如图1所示。这种高内聚低耦合的设计原则使系统具有更好的重用性，维护性和扩展性。例如，如果hostDBProcessor需要进行DNS解析，可以直接调用dnsProcessor的相关函数，而无需关注DNS解析的细 节；dnsProcessor也只需封装DNS请求和解析DNS应答，和网络相关的功能可以调用netProcessor来完成。
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