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The "FAQ_JP" page has been changed by shot6. http://wiki.apache.org/cassandra/FAQ_JP?action=diff&rev1=52&rev2=53 -------------------------------------------------- [CassandraHardware]を参照してください. <<Anchor(architecture)>> - == What are SSTables and Memtables? == + == SSTablesとMemtablesって何ですか? == - See [[MemtableSSTable]] and [[MemtableThresholds]]. + [[MemtableSSTable]] と [[MemtableThresholds]]を見てください. <<Anchor(working_with_timeuuid_in_java)>> - == Why is it so hard to work with TimeUUIDType in Java? == + == Javaで何故TimeUUIDTypeを使うのが難しいのでしょうか? == - TimeUUID's are difficult to use from java clients because java.util.UUID does not support generating version 1 (time-based) UUIDs. Here is one way to work with them and Cassandra: + TimeUUIDはJavaから使うのは困難です．なぜなら、java.util.UUIDがversion 1 (time-based) UUIDしかサポートしていなからです． + しかし、Javaでも以下のようにすれば使うことは可能です． - Use the UUID generator from: http://johannburkard.de/software/uuid/ + まず、[[http://johannburkard.de/software/uuid/|このUUID generator]]を使います． + 以下の3つのメソッドはCassandraでUUIDを使う際に大変便利です． - Below are three methods that are quite useful in working with the uuids as they come in and - out of Cassandra. - Generate a new UUID to use in a TimeUUIDType sorted column family. + TimeUUIDTypeでソートされるカラムファミリでUUIDを生成する. {{{ /** @@ -130, +130 @@ } }}} + java.util.UUIDが簡単にbyte[]からTimeUUIDに変換する方法を持っていないため、com.eaio.uuid.UUIDにそのまま渡して処理してもらいましょう． - When you read out of cassandra your getting a byte[] that needs to be converted into a TimeUUID - and since the java.util.UUID doesn't seem to have a simple way of doing this, pass it through - the eaio uuid dealio again. {{{ /** @@ -158, +156 @@ } }}} - When you want to actually place the UUID into the Column then you'll want to convert it like this. - This method is often used in conjuntion with the getTimeUUID() mentioned above. + 仮にカラムの中にUUIDを入れたい場合は、以下のようにします． + このメソッドは上で示したgetTimeUUID()との結合部分になります． {{{ /**
