close
Warning:
Can't synchronize with repository "(default)" (Unsupported version control system "svn": /usr/lib/python2.7/dist-packages/libsvn/_repos.so: failed to map segment from shared object: Cannot allocate memory). Look in the Trac log for more information.
2009-08-10
- [提案] 民生節能計畫：國科會線上作業重新上傳與確認
- [論文] E2GC2 論文實驗補強
- [成大實習生]
- Google Chart API 簡報
- ZigBee 簡報
- Hadoop JSP 機制追蹤
Hadoop
- Cascading - a feature rich API for defining and executing complex, scale-free, and fault tolerant data processing workflows on a Hadoop cluster.
- File Appends in HDFS - Tom White 寫的簡介，說明 HDFS 上的檔案擴增(Append)
## 早期的 HDFS 不支援 Append，檔案只有當 close 時才寫入。
Early versions of HDFS had no support for an append operation.
Once a file was closed, it was immutable and could only be changed by writing a new copy with a different filename.
A file didn’t exist until it had been successfully closed (by calling FSDataOutputStream’s close() method).
## 0.19.0 版有支援 HDFS Append File
in July 2008, the append operation was committed in time for the 0.19.0 release of Hadoop Core.
## 0.19.1 版預設關閉 HDFS Append File, 0.20.0 將 dfs.support.append 預設為不支援
append support was disabled in the 0.19.1 release of Hadoop Core,
and in the first release of the 0.20 branch 0.20.0.
Configuration parameter dfs.support.append, which is false by default
Cloud Computing
File System
HPC
- hpcc- HPC Challenge Benchmark
Web Service : OpenID
商業策略
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