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Thursday, 27 May 2010
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Release: Kyoto Cabinet 1.0.0

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Kyoto Cabinet, the successor of Tokyo Cabinet has reached the first stable release: 1.0. The ☞ announcement is pretty reach in details and provides code samples fot all currently supported bindings (C, C++, Java, Python, Ruby, Perl).

Kyoto architecture looks quite interesting and is depicted below:

Mikio Hirabayashi, lead developer, speaking about Kyoto Cabinet vs Tokyo Cabinet:

Kyoto Cabinet has the following features. Especially, Windows support is remarkable.

  • time efficiency: Throughput of updating is more than 100 millions query-per-second.
  • space efficiency: Footprint for each record is 8-16 bytes in the hash DB, 2-4 bytes in the tree DB. concurrency: The hash DB uses read-write lock for each record. The tree DB uses read-write lock for each page.
  • usability: Generic operations of database by interface like the “Visitor” pattern are provided.
  • robustness: Manual transaction, auto transaction, and auto recovery are provided.
  • portability: UNIX-like systems (Linux, FreeBSD, Solaris, Mac OS X) and Windows (VC++) are supported. language bindings: C++, C, Java, Python, Ruby, and Perl are supported.

Compared with Tokyo Cabinet, KC is superior in concurrency, usability, and portability. Although time efficiency for single-thread is better in TC, I recommend KC from now on because multi-core/many-core CPU has been popular. However, I will keep on maintaining TC and fix bugs if they are found.

While Kyoto Cabinet sounds really interesting, I cannot stop asking myself if is this the time to move away from Tokyo Cabinet?