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我建立了一个cassandra集群,并使用spring-cassandra框架1.53。 (http://docs.spring.io/spring-data/cassandra/docs/1.5.3.RELEASE/reference/html/)cassandra-spring ingest命令不起作用
我想将数百万数据集写入我的cassandra集群。 executeAsync的解决方案效果很好,但spring框架中的“摄取”命令听起来也很有趣。
摄取方法利用静态的PreparedStatements,这些静态PreparedStatements仅为性能准备一次。数据集中的每条记录都绑定到相同的PreparedStatement,然后异步执行以获得高性能。
我的代码:
List<List<?>> session_time_ingest = new ArrayList<List<?>>();
for (Long tokenid: listTokenID) {
List<Session_Time_Table> tempListSessionTimeTable = repo_session_time.listFetchAggregationResultMinMaxTime(tokenid);
session_time_ingest.add(tempListSessionTimeTable);
}
cassandraTemplate.ingest("INSERT into session_time (sessionid, username, eserviceid, contextroot," +
" application_type, min_processingtime, max_processingtime, min_requesttime, max_requesttime)" +
" VALUES(?,?,?,?,?,?,?,?,?)", session_time_ingest);
抛出异常:
`Exception in thread "main" com.datastax.driver.core.exceptions.CodecNotFoundException: Codec not found for requested operation: [varchar <-> ...tracking.Tables.Session_Time_Table]
at com.datastax.driver.core.CodecRegistry.notFound(CodecRegistry.java:679)
at com.datastax.driver.core.CodecRegistry.createCodec(CodecRegistry.java:540)
at com.datastax.driver.core.CodecRegistry.findCodec(CodecRegistry.java:520)
at com.datastax.driver.core.CodecRegistry.codecFor(CodecRegistry.java:470)
at com.datastax.driver.core.AbstractGettableByIndexData.codecFor(AbstractGettableByIndexData.java:77)
at com.datastax.driver.core.BoundStatement.bind(BoundStatement.java:201)
at com.datastax.driver.core.DefaultPreparedStatement.bind(DefaultPreparedStatement.java:126)
at org.springframework.cassandra.core.CqlTemplate.ingest(CqlTemplate.java:1057)
at org.springframework.cassandra.core.CqlTemplate.ingest(CqlTemplate.java:1077)
at org.springframework.cassandra.core.CqlTemplate.ingest(CqlTemplate.java:1068)
at ...tracking.SessionAggregationApplication.main(SessionAggregationApplication.java:68)`
我的编码完全一样的弹簧卡珊德拉数独..我不知道怎么的值映射我反对卡桑德拉期待的价值观?
谢谢!完美的作品 –