11. Cassandra Reference Information¶
In this section, reference information about Cassandra will be introduced.
11.1. cassandra.yaml Major Items List¶
| Item Name | Initial Value | Description |
| cluster_name | Test Cluster | Cluster Name |
| initial_token | <no statement> | If you specify Token and have it participate in the cluster, statement
is made here. If it is null, Token will be allocated to the range
which is covered by the node with the highest load. It will be randomly
allocated, if there is no load information such as completely new node.
|
| hinted_handoff_enabled | true | Please refer to Cassandra official wiki hinted handoff for details. |
| authenticator | org.apache.cassandra.auth.AllowAllAuthenticator | This setting item is for the authentication for accessing Cassandra.
Initial setting is no use of authentication.
Please refer to [Cassandra Connection Authentication Setting] for details.
|
| authority | org.apache.cassandra.auth.AllowAllAuthority | This setting item is for the user approval for accessing Cassandra.
Initial setting is all connections are permitted.
Please refer to [Cassandra Connection Authentication Setting] for details.
|
| partitioner | org.apache.cassandra.dht.RandomPartitioner | It sets how to place the data in the node within the cluster. |
| data_file_directories | /var/lib/cassandra/data | Location for storing real data. |
| commitlog_directory | /var/lib/cassandra/commitlog | Location for storing CommitLog. |
| saved_caches_directory | /var/lib/cassandra/saved_caches | Location for storing cache data. |
| commitlog_sync | periodic | It sets the method of storing CommitLog. Selection is to be made from
[periodic/batch].
|
| commitlog_sync_period_in_ms | 10000 | CommitLog is written with a specified interval of milliseconds. |
| seeds | 127.0.0.1 | If the nodes participate in the cluster, it specifies your own IP
and other node in the cluster.
|
| disk_access_mode | auto | It sets the use of mmaped I/O. It is effective for 64bit JVM.
Use of initial value “auto” is recommended (up to Cassandra1.1.4).
|
| concurrent_reads | 32 | Number of read processes concurrently processed. 1CPU core numberx2 is recommended. |
| concurrent_writes | 32 | Number of read processes concurrently processed. |
| storage_port | 7000 | Port number for data exchange with other nodes is specified. |
| listen_address | localhost | Address to be used for inter-node communication.
It states the network side address of the node to be used
that participates in multiple networks.
|
| rpc_address | localhost | IP address which permits external connection by Thrift. |
| rpc_port | 9160 | Port number to be used for external communication by Thrift.
|
| rpc_keepalive | true | It selects if KeepAlive attribute is used in RPC connection. |
| thrift_framed_transport_size_in_mb | 15 | It specifies the size of frame buffer used by Thrift in MB. |
| snapshot_before_compaction | false | It specifies if snapshot is taken before Compaction. |
| in_memory_compaction_limit_in_mb | 64 | It limits the size of column compressed on memory.
Recommended value is 5% to 10% of available Java heap size.
|
| rpc_timeout_in_ms | 10000 | Timeout value before command error is returned. |
| dynamic_snitch | true | Data is loaded from the node other than the one on which response speed
has slowed down because of Compaction execution (until Cassandra1.1.4).
|
| request_scheduler | org.apache.cassandra.scheduler.NoScheduler | Algorithm to limit the number of request issuance time is specified. |
11.2. External Site¶
| Site Name | URL |
| Apache Cassandra | http://cassandra.apache.org/ (English) |
| Cassandra Wiki | http://wiki.apache.org/cassandra/ (English)
|
| Cassandra Hardware Sizing | |
| datastaxのApache Cassandra 1.1 Document | http://www.datastax.com/docs/1.1/index (English) |