Changes between Version 30 and Version 31 of HyperTable

Timestamp:

Jul 3, 2008, 3:31:57 PM (16 years ago)

Author:

sunny

Comment:

--

HyperTable

@@ -50 +50 @@
  * Hypertable 提供使用者可以透過存取群組機制來控制行資料如何實際地儲存在DFS裡。每一行家族屬於單一存取群組,所有再存取群組裡行家族的資料都實際地一起儲存在硬碟裡。這可以改善被存取頻繁的行家族之讀寫效能。以下舉個例子,一個table有100個行家族,但只有兩個行家族比較常被存取。如果這兩個行家族一起被儲存在他們自己的存取群組,那麼為了要存取它們,系統將作disk I/O只須針對這兩行。若沒有存取群組,即使只有兩行的資料要存取,這100行的資料都將實際地被讀寫。
 
-== 【Performance】 ==
+== 【效能】 ==
  * Performance Test: [http://code.google.com/p/hypertable/wiki/PerformanceTestAOLQueryLog AOL Query Log](from Google)
   * Machine Profile
@@ -61 +61 @@
 == 【How we use it】 ==
  * [http://trac.nchc.org.tw/cloud/wiki/HyperTable/BioInfo_Project 以陽明的病人屬性分類資料為範本來建立資料庫]
-== 【Similar Project】 ==
+== 【同質專案】 ==
  * [http://hadoop.apache.org/hbase/ HBase]: Bigtable-like structured storage for Hadoop HDFS
   * Hypertable is based very closely on the design of Bigtable, with a few modifications. Hypertable is designed for speed and is written in C++, while Hbase is in Java.
@@ -68 +68 @@
  * [http://diststore.com/ DistStore]
   * DistStore is a family of lightweight [http://developers.facebook.com/thrift Thrift] based web services which are extremely scalable in both throughput and dataset size. Its purpose is to offer a simple and flexible data storage solution that can grow with your project from inception to millions of users.
-== 【Reference】 ==
+== 【參考】 ==
  * [http://www.hypertable.org/ HyperTable 官方網站]
  * [http://my.donews.com/eraera/2006/09/26/swogzstwtqdnwlfrzgsljctkjsbrtuiumxzj/ 翻譯:Google BigTable] - [http://labs.google.com/papers/bigtable-osdi06.pdf 原文(PDF)]
@@ -80 +80 @@
  * [http://ieeexplore.ieee.org/iel3/4957/13637/00626582.pdf A Hypertabular Visualizer of Query Results]
  * [http://code.google.com/p/hypertable/wiki/ArchitecturalOverview Hypertable的架構說明]
-== 【Related News】 ==
+== 【相關新聞】 ==
  * [http://news.sina.com.tw/tech/sinacn/cn/2008-02-19/154038229686.shtml 微軟收購雅虎存在諸多障礙]
  * [http://www.linuxworld.com/news/2008/020608-hypertable.html Zvents releases open-source cluster database]
  * [http://reddit.com/r/programming/info/67zfd/comments/ 關於Hypertable資料寫入檔案系統的問題]
-== 【Technology】 ==
+== 【技術文章】 ==
  * Hypertable Installation Guide: [http://trac.nchc.org.tw/cloud/wiki/HyperTable/HowToInstall How to install]
  * Hypertable Documentation Tree: [http://140.110.138.176/hypertable/html/inherits.html Source Code Documentation Tree](Doxygen)
  * Hypertable Query Language(HQL) Guide: [http://trac.nchc.org.tw/cloud/wiki/HyperTable/HQLTutorial HQL Hwo To]
 
-== 【Discussion】 ==
+== 【網路上的討論新聞】 ==
 
  * 關聯式資料庫的優勢逐漸消失??
@@ -96 +96 @@
    * [http://www.infoq.com/cn/news/2008/01/mapreduce-rdbms MapReduce是倒退：拿它與關係數據庫比較公平嗎？]
    * [http://almaer.com/blog/the-new-attack-on-the-rdbms The new attack on the RDBMS]
+== 【常見問題】 ==
+ 1. Hypertable資料庫系統在執行關閉伺服器指令後，再重新啟動時裡面的資料表都會遺失? [[BR]]
+   Ans: 在Hypertable裡所有的系統設定都包含在conf目錄下的hypertable.cfg檔案裡，裡面有一個DfsBroker.Local.Root設定值可以指定要使用的檔案系統路徑，預設的系統路徑是Hypertable工作目錄的fs/local路徑裡，以fs/local目錄建立在本機磁碟機為例，啟動後所建立的表格都會登錄在fs/local/hypertable/tables目錄裡，一旦停止服務後這些資料表資料又會遺失，因此上網路討論區找到了一些資料來佐證目前alpha版的hypertable是不支援永續儲存資料庫功能。[http://groups.google.com/group/hypertable-user/browse_thread/thread/0f37be8c24328e05 討論區]原文如下：
+{{{
+問題：
+what is the clean way to shut down a local instance of
+Hypertable?  If I just use bin/kill-servers.sh (which as far as I see
+just sends a SIGKILL which does not look like a good way to shut down
+a database), I do not see any tables next time I start servers with
+bin/start-all-servers.sh local. 
+Hypertable的作者Doug回覆：
+As far as clean shutdown goes, there currently isn't one.  This is why we
+released the software as "alpha".  We're currently working on recovery and
+as soon as it's in place, we'll move from "alpha" to "beta".
+}}}
+　　輔充說明：HBase支援永續儲存資料庫功能