實時流式計算框架Storm 0.9.0發佈通知(中文版)

Storm0.9.0發佈通知中文翻譯版(2013/12/10 by 富士通邵賢軍 有錯誤必定告訴我 shaoxianjun@hotmail.com^_^html

  咱們很高興宣佈Storm 0.9.0已經成功發佈,你能夠從the downloads page下載. 本次發佈對茁壯成長的Storm來講是一次巨大的進步。java

  咱們追加了一些新特性,你會在下面看到詳細的介紹, 此外此次發佈的另外一個着重點是修復了大量跟穩定性相關的 bug. 雖然不少用戶已經在本身的環境中把0.9.x版本的Storm成功運行起來,但咱們不保證那些版本的穩定性。0.9.0是目前最穩定的版本,咱們強烈推薦各位使用,特別是0.8.x的用戶們。git

特性1:Netty作消息傳輸層

  第一個重大的特色是新的傳輸層。咱們引入了使用純Java語言編寫的Netty做爲咱們的傳輸層,這個工做是由好基友Yahoo! Engineering完成的。關於Storm的核心消息傳輸層能以插拔形式更換這一點,我想你們都知道了,只惋惜原來只有ZeroMQ,而如今Storm提供了兩種消息傳輸層實現,分別是原來的ZeroMQ和新的Netty。github

  在之前的版本里,Storm只能依賴ZeroMQ作消息的傳輸,但它其實並很差,我也不曉得Nathan爲何頭腦熱使用了ZeroMQ。爲何ZeroMQ很差呢?這是因爲:算法

1.ZeroMQ是一個本地化的消息庫,它過分依賴操做系統環境;瀏覽器

2.安裝起來比較麻煩;安全

3.ZeroMQ的穩定性在不一樣版本之間差別巨大,而且目前只有2.1.7版本的ZeroMQ能與Storm協調的工做。app

  咱們引入Netty的緣由是:運維

1.平臺隔離,Netty是一個純Java實現的消息隊列,能夠幫助Storm實現更好的跨平臺特性,同時基於JVM的實現可讓咱們對消息有更好的控制;ssh

2.高性能,Netty的性能要比ZeroMQ快兩倍左右,這裏有一篇文章this blog post 專門比較了ZeroMQ和Netty的性能(待翻譯)。

3. 安全性認證,使得咱們未來要作的 worker 進程之間的認證受權機制成爲可能。

  若是要在Storm裏使用Netty作傳輸層,只須要簡單的把下面的內容加入到storm.yaml中,並根據你的實際狀況調整參數便可:

storm.messaging.transport: "backtype.storm.messaging.netty.Context"
storm.messaging.netty.server_worker_threads: 1
storm.messaging.netty.client_worker_threads: 1
storm.messaging.netty.buffer_size: 5242880
storm.messaging.netty.max_retries: 100
storm.messaging.netty.max_wait_ms: 1000
storm.messaging.netty.min_wait_ms: 100

  若是你不喜歡ZeroMQ或者Netty,你也能夠經過實現backtype.storm.messaging.IContextinterface來用本身的消息傳輸層,可是要知足幾個條件,這裏就很少說了。

特性2:日誌查看UI

  新版本的Storm增長了一個很給力的特性用來調試和監視topology——logviewer進程。在早期的版本里,查看Worker節點的日誌決定於Worker節點的位置(host/port),典型的是經過Storm UI,而後用ssh鏈接那個主機查看該主機上worker的日誌文件。在最新的日誌查看機制裏,如今能夠很容易的去訪問一個指定worker節點的日誌,你只須要在瀏覽器中的StormUI裏點擊worker的port就能夠了。

新的logviewer進程與supervisor是相對獨立的進程,若是要在新的Storm裏啓動它,你只須要在集羣的supervisor節點執行以下命令:

    $ storm logviewer

特性3:跨平臺

  在之前的版本里,若是想在Windows平臺上運行Storm,你須要安裝ZeroMQ,修改Storm的源碼,追加一些Windows平臺特定的腳本。而在新的版本里,由於用netty替換了ZeroMQ,因爲netty用純java實現,所以使得Storm具備更好的跨平臺特性,如今要在Windows上運行Storm比之前容易不少。

特性4:安全

  安全,認證,受權這些一直是很是重要的領域,咱們在後續會持續追加相關的特性,Storm0.9.0提供了API用來實現可插拔的Tuple序列化,而且有一個基於BlowFish的加密算法來用於加密Tuple的實現。

特性5:API 兼容性和升級

  對大多數的Storm開發者來講,更新到0.9.0只是簡單的更新它的依賴包而已,Storm的核心API自從0.8.2以來變動不多。而在生產環境中的開發運維方面,若是要更新最新的Storm,最好在升級以前把已經存在的狀態信息給清空,好比ZooKeeper上的信息和storm.local.dir配置的信息。

特性6:日誌方式變動

  另外一個很是大的變化是對日誌的改變,Storm裏面大量使用slf4j 的API,而有些Storm的依賴庫或Storm的使用者則依賴於log4j的API。因此如今Storm改成依賴於log4j-over-slf4j,它能夠在log4j與slf4j之間架起一座橋樑。這些改變會涉及到已經使用log4jAPI的拓撲和拓撲組件。總之,若是能夠的話,仍是儘量的使用slf4j的API來作日誌記錄吧!

鳴謝

  最後特別感謝那些爲Storm的貢獻的小夥伴們,不論是貢獻代碼、文檔、提BUG或者在郵件列表裏爲其餘人提供幫助的人,大家都功不可沒,Nathan愛大家,Storm小組愛大家。

0.9.0變動日誌

  • Update build configuration to force compatibility with Java 1.6
  • Fixed a netty client issue where sleep times for reconnection could be negative (thanks brndnmtthws)
  • Fixed an issue that would cause storm-netty unit tests to fail
  • Added configuration to limit ShellBolt internal _pendingWrites queue length (thanks xiaokang)
  • Fixed a a netty client issue where sleep times for reconnection could be negative (thanks brndnmtthws)
  • Fixed a display issue with system stats in Storm UI (thanks d2r)
  • Nimbus now does worker heartbeat timeout checks as soon as heartbeats are updated (thanks d2r)
  • The logviewer now determines log file location by examining the logback configuration (thanks strongh)
  • Allow tick tuples to work with the system bolt (thanks xumingming)
  • Add default configuration values for the netty transport and the ability to configure the number of worker threads (thanks revans2)
  • Added timeout to unit tests to prevent a situation where tests would hang indefinitely (thanks d2r)
  • Fixed an issue in the system bolt where local mode would not be detected accurately (thanks miofthena)
  • Fixed storm jar command to work properly when STORM_JAR_JVM_OPTS is not specified (thanks roadkill001)
  • All logging now done with slf4j
  • Replaced log4j logging system with logback
  • Logs are now limited to 1GB per worker (configurable via logging configuration file)
  • Build upgraded to leiningen 2.0
  • Revamped Trident spout interfaces to support more dynamic spouts, such as a spout who reads from a changing set of brokers
  • How tuples are serialized is now pluggable (thanks anfeng)
  • Added blowfish encryption based tuple serialization (thanks anfeng)
  • Have storm fall back to installed storm.yaml (thanks revans2)
  • Improve error message when Storm detects bundled storm.yaml to show the URL's for offending resources (thanks revans2)
  • Nimbus throws NotAliveException instead of FileNotFoundException from various query methods when topology is no longer alive (thanks revans2)
  • Escape HTML and Javascript appropriately in Storm UI (thanks d2r)
  • Storm's Zookeeper client now uses bounded exponential backoff strategy on failures
  • Automatically drain and log error stream of multilang subprocesses
  • Append component name to thread name of running executors so that logs are easier to read
  • Messaging system used for passing messages between workers is now pluggable (thanks anfeng)
  • Netty implementation of messaging (thanks anfeng)
  • Include topology id, worker port, and worker id in properties for worker processes, useful for logging (thanks d2r)
  • Tick tuples can now be scheduled using floating point seconds (thanks tscurtu)
  • Added log viewer daemon and links from UI to logviewers (thanks xiaokang)
  • DRPC server childopts now configurable (thanks strongh)
  • Default number of ackers to number of workers, instead of just one (thanks lyogavin)
  • Validate that Storm configs are of proper types/format/structure (thanks d2r)
  • FixedBatchSpout will now replay batches appropriately on batch failure (thanks ptgoetz)
  • Can set JAR_JVM_OPTS env variable to add jvm options when calling 'storm jar' (thanks srmelody)
  • Throw error if batch id for transaction is behind the batch id in the opaque value (thanks mrflip)
  • Sort topologies by name in UI (thanks jaked)
  • Added LoggingMetricsConsumer to log all metrics to a file, by default not enabled (thanks mrflip)
  • Add prepare(Map conf) method to TopologyValidator (thanks ankitoshniwal)
  • Bug fix: Supervisor provides full path to workers to logging config rather than relative path (thanks revans2)
  • Bug fix: Call ReducerAggregator#init properly when used within persistentAggregate (thanks lorcan)
  • Bug fix: Set component-specific configs correctly for Trident spouts

原文地址:http://storm-project.net/2013/12/08/storm090-released.html

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