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Posted to user@gora.apache.org by Henry JunYoung Kim <he...@gmail.com> on 2012/08/26 07:38:32 UTC
better idea to use byte[] as a keyClass
Hi,
I am new for Gora.
to define keyClass, currently I describe it as bytes like this.
{
"type": "record",
"name": "Twitter",
"namespace": "net.daum.drp.bifrost.storage.generated",
"fields" : [
{"name": "id", "type":"bytes"},
{"name": "url", "type": "string"},
{"name": "timestamp", "type": "long"},
{"name": "contents", "type": "string"}
]
}
and in an application, I created an instance to use Twitter class.
private DataStore<ByteBuffer, Twitter> dataStore;
but, this DataStore instance causes an error to use.
org.apache.gora.util.GoraException: java.lang.RuntimeException: java.lang.IllegalStateException: tableName is not specified
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:167)
at org.apache.gora.store.DataStoreFactory.getDataStore(DataStoreFactory.java:278)
at net.daum.drp.bifrost.storage.App.<init>(App.java:19)
at net.daum.drp.bifrost.storage.App.main(App.java:78)
Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: tableName is not specified
at org.apache.gora.hbase.store.HBaseStore.initialize(HBaseStore.java:125)
at org.apache.gora.store.DataStoreFactory.initializeDataStore(DataStoreFactory.java:102)
at org.apache.gora.store.DataStoreFactory.createDataStore(DataStoreFactory.java:161)
... 3 more
Caused by: java.lang.IllegalStateException: tableName is not specified
at org.apache.gora.hbase.store.HBaseMapping$HBaseMappingBuilder.build(HBaseMapping.java:166)
at org.apache.gora.hbase.store.HBaseStore.readMapping(HBaseStore.java:592)
at org.apache.gora.hbase.store.HBaseStore.initialize(HBaseStore.java:111)
... 5 more
in my guess, as a key type, ByteBuffer is not available.
so, is there any better ideas to use byte array type as a key.
ps) actually, in my needs, there is what I want to use a composite key.
this is is consists of Long, Long and unfixed String type data.
thanks for your readings.