cassandra-2.0

问题 I am using java driver version: 2.1.4 Cassandra version: dsc-cassandra-2.1.10 Output from cql gives the following cqlsh 5.0.1 | Cassandra 2.1.10 | CQL spec 3.2.1 | Native protocol v3 I am protocol V3. But it throws an exception when I try to set it to more than 128 requests per connection. This seems to be a restriction in V2. Explained below: The following code block: PoolingOptions poolingOptions = new PoolingOptions(); poolingOptions.setCoreConnectionsPerHost(HostDistance.LOCAL, 8);

问题 I am using java driver version: 2.1.4 Cassandra version: dsc-cassandra-2.1.10 Output from cql gives the following cqlsh 5.0.1 | Cassandra 2.1.10 | CQL spec 3.2.1 | Native protocol v3 I am protocol V3. But it throws an exception when I try to set it to more than 128 requests per connection. This seems to be a restriction in V2. Explained below: The following code block: PoolingOptions poolingOptions = new PoolingOptions(); poolingOptions.setCoreConnectionsPerHost(HostDistance.LOCAL, 8);

问题 I am trying to run my first spark job (a Scala job that accesses Cassandra) which is failing and showing the following error : java.io.IOException: Failed to open native connection to Cassandra at {<ip>}:9042 at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:164) at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$2.apply(CassandraConnector.scala:150) at com.datastax.spark.connector

问题 I am trying to run my first spark job (a Scala job that accesses Cassandra) which is failing and showing the following error : java.io.IOException: Failed to open native connection to Cassandra at {<ip>}:9042 at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:164) at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$2.apply(CassandraConnector.scala:150) at com.datastax.spark.connector

问题 I've a cassandra table definition as following CREATE TABLE mytable ( colA text, colB text, timeCol timestamp, colC text, PRIMARY KEY ((colA, colB, timeCol), colC) ) WITH.... I want to know if number of tombstones would vary between following types of queries: 1. delete from mytable where colA = '...' AND colB = '...' and timeCol = 111 Above query affect multiple records, (multiple values of colC) 2. delete from mytable where colA = '...' AND colB = '...' and timeCol = 111 AND colC = '...'

问题 Lets assume I have a Column Family with following schema: CREATE TABLE users ( user_id timeuuid, name varchar, last_name varchar, children list, phone_numbers map, PRIMARY KEY(user_id) ); Then I insert a row into this CF with "USING TTL 60000". When I want to verify if any of these columns still has TTL set I get error: "Cannot use selection function ttl on collections". My question is: how to get TTL on elements of a column that is defined as collection ? Cheers! 回答1: I reproduced your

问题 We recently (this week) upgraded our java driver from 2.0.4 to 2.1.4 (we are running Cassandra version 2.0.12). We were using 2.0.4 for a long time (more than an year) in production and did not have this issue. But, after upgrading we starting seeing intermittent NoHostAvailableExceptions (that fail all the requests on client side): Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried) at com.datastax.driver.core

问题 We recently (this week) upgraded our java driver from 2.0.4 to 2.1.4 (we are running Cassandra version 2.0.12). We were using 2.0.4 for a long time (more than an year) in production and did not have this issue. But, after upgrading we starting seeing intermittent NoHostAvailableExceptions (that fail all the requests on client side): Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried) at com.datastax.driver.core

问题 We recently (this week) upgraded our java driver from 2.0.4 to 2.1.4 (we are running Cassandra version 2.0.12). We were using 2.0.4 for a long time (more than an year) in production and did not have this issue. But, after upgrading we starting seeing intermittent NoHostAvailableExceptions (that fail all the requests on client side): Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried) at com.datastax.driver.core

问题 How to set Cassandra (>2.0) JVM heap size of 8GB? When I type in free -m it gives me the following. How can I set the Cassandra JVM heap size to 8GB? total used free shared buffers cached Mem: 16047 11336 4711 0 81 5814 -/+ buffers/cache: 5441 10606 Swap: 0 0 0 回答1: As stated in the Tuning Java resources section of the documentation: If you decide to change the Java heap sizing, both MAX_HEAP_SIZE and HEAP_NEWSIZE should should be set together in conf/cassandra-env.sh. Inside cassandra-env.sh