hector

I'm using Cassandra, and I want to make a data browser which shows the contents of any column family. I need to get the column names to configure a UI grid. Is it possible to collect the names of columns in all rows? The best way, if you are using Cassandra 1.1: SELECT column_name FROM system.schema_columnfamilies WHERE keyspace_name = X AND columnfamily_name = Y See also http://www.datastax.com/dev/blog/schema-in-cassandra-1-1 There are several parts to this answer. First, to answer your specific question, you should use a sliceQuery to get all of the columns in a row. Pass an empty

I'm new to cassandra and hector so i'm trying to execute cql queries but the problem is that not all columns are of type string so how dow I execute the query "select * from users"? My column family looks like this: UPDATE COLUMN FAMILY users WITH comparator = UTF8Type AND key_validation_class=UTF8Type AND column_metadata = [ {column_name: full_name, validation_class: UTF8Type} {column_name: email, validation_class: UTF8Type} {column_name: state, validation_class: UTF8Type, index_type: KEYS} {column_name: gender, validation_class: UTF8Type} {column_name: birth_year, validation_class: LongType,

For operations monitoring of my application, I am looking for something similar to the commonly used "SQL connection validation" query SELECT 1; in Cassandra, using the Hector driver. I have tried things like looking at Cluster.getKnownPoolHosts() and .getConnectionManager().getActivePools(). But it seems that their status is not continuously updated, only when I actually try to access Cassandra with a query. I'd like my health check to be independent of any keyspaces or user CFs that need to exist, so just running a "dummy" query seems difficult (against what?). And of course it shouldn't

where can I find samples for this? Most of my code using ColumnFamilyTemplate to do CRUD on the data records, see below. Once I have the composite key defined, can I still use ColumnFamilyTemplate to access my data having composite keys? private static final ColumnFamilyTemplate<UUID, String> template = new ThriftColumnFamilyTemplate<UUID, String>( Bootstrap.keyspace, "User", UUIDSerializer.get(), StringSerializer.get(), HFactory.createMutator(Bootstrap.keyspace, UUIDSerializer.get())); It shouldn't matter which API you use to do the CRUD on the records; CompositeType (or DynamicCompositeType)

I'm currently experimenting around with Cassandra. On the client-side (with Hector) I look up a few keys like this: ColumnFamilyResult<String, String> result = template.queryColumns(Arrays.asList("key1","key2","key3")); Most of the time it seems to work. But other times I get a timeout exception on the client: Caused by: me.prettyprint.hector.api.exceptions.HTimedOutException: TimedOutException() at me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:35) at me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate$1.execute

I'm testing the connection to Cassandra Database over Hector. But when I run the Junit Tests I constanly get following message: java.lang.NoSuchFieldError: DEFAULT_MEMTABLE_THROUGHPUT_IN_MB Does somebody know what I do wrong? Thanks for your help, Chris ------------------------------------------------------------------------------- Test set: com.acolsolutions.trademaniac.CreateSchemaTest ------------------------------------------------------------------------------- Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.287 sec <<< FAILURE! testAddDropKeyspace(com.acolsolutions