cassandra-cli

来源： https://stackoverflow.com/questions/30316137/what-are-the-maximum-number-of-columns-allowed-in-cassandra

问题 [root@SudeepMangu bin]# ./cassandra -f xss = -ea -javaagent:/home/sudeep/apache-cassandra-1.2.5-src/lib/jamm-0.2.5.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms930M -Xmx930M -Xmn200M -XX:+HeapDumpOnOutOfMemoryError -Xss160k Exception in thread "main" java.lang.NoClassDefFoundError: * org/apache/cassandra/service/CassandraDaemon * Caused by: java.lang.ClassNotFoundException: org.apache.cassandra.service.CassandraDaemon at java.net.URLClassLoader$1.run(URLClassLoader.java:202)

问题 I am trying to run Cassandra. But, I am getting this error: [root@SudeepMangu bin]# ./cassandra -f xss = -ea -javaagent:/home/sudeep/apache-cassandra-1.2.5-src/lib/jamm-0.2.5.jar- XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms930M -Xmx930M -Xmn200M - XX:+HeapDumpOnOutOfMemoryError -Xss160k Error occurred during initialization of VM Could not reserve enough space for object heap I have tried setting JAVA_OPTS to max size with no effect. 回答1: See my answer here, https://stackoverflow

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I am working in mobile chat application using ejabberd as server and mysql as main database to store user's details. I want to store chat messages in NoSQL database for fast retrieval and avoid traffic.Each conversation should be in single key.There are different NoSQl databases like Hbase, Cassandra, Riak

问题 I want to select specific fields of a table in cassandra and insert them into another table. I do this in sql server like this: INSERT INTO Users(name,family) SELECT name,family FROM Users How to to this in cassandra-cli or cqlsh? 回答1: COPY keyspace.columnfamily1 (column1, column2,...) TO 'temp.csv'; COPY keyspace.columnfamily2 (column1, column2,...) FROM 'temp.csv'; here give your keyspace(schema-name) and instead of columnfamilyname1 use the table to which you want to copy and in

问题 I am newbie to cassandra . I need to copy data from one columnFamily to another columnFamily in same keyspace in cassandra .Say for ex we have a A1 columnFamily in keyspace K1 , so now i need to create columnFamily A2 in the same keyspace K1 .Here i need to copy data from columnFamily A1 to A2 .A1 and A2 have the same schema .I read online docs where in we can use sstable loader to copy data from one cassandra cluster to another . But here i need to copy data from one columnFamily to another

问题 How to get Last 6 Month data comparing with timestamp column using cassandra query? I need to get all account statement which belongs to last 3/6 months comparing with updatedTime(TimeStamp column) and CurrentTime . For example in SQL we are using DateAdd() function tor this to get. i dont know how to proceed this in cassandra. If anyone know,reply.Thanks in Advance. 回答1: Cassandra 2.2 and later allows users to define functions (UDT) that can be applied to data stored in a table as part of a

问题 i want to use php for my project with phpcassa which doesn't support cql, so if I understood right I have to code cassandra commands like I would with cassandra-cli. My question is how can I create a Composite-keyed Table or Dynamic Column Families like in this website, though not with cql but with cassandra-cli and where can I find more information about this language. 回答1: create column family myColumnFamily with key_validation_class = 'CompositeType(UUIDType,UTF8Type)' and comparator =

问题 I am trying to get familiar with Apache Cassandra, for a particular PoC work. After going through various articles on the net, trying out various libraries/clients available, a particular question pops up in my mind. The initial reason why we thought of Cassandra, is because we wanted a 'truly' distributed datastore. From my understanding of 'distribution', it ultimately boils down to some sort of 'key-value' and some sort of 'consistent hashing', if I am able to express myself in a super

问题 I have a cluster of 3 Cassandra 2.0 nodes. My application I wrote a test which tries to write and read some data into/from Cassandra. In general this works fine. The curiosity is that after I restarted my computer, this test will fail, because after writting I read the same value I´ve write before and there I get null instead of the value, but the was no exception while writing. If I manually truncate the used column family, the test will pass. After that I can execute this test how often I