问题
Recently I've started working on Grails integration with Cassandra using the Java driver for cassandra(cassandra-driver-core-2.0.2). So I was curious to know how we can find out how much size our table is taking to store the data in cassandra DB.
I have created a keyspace with name Customkeyspace and a column family called Movie in it. So I was curious to know which tool/Command I have to use to know the size of the keyspace/Column family ?
回答1:
To get statistics regarding column families in Cassandra, you can simply run the command:
nodetool cfstats
It reports statistics about tables which include the live data size as well as on disk.
The documentation about this utility for Cassandra 2.1 is available here.
回答2:
To get the statistics regarding column families in Cassandra with respect to keyspaces or tables, you can simply run the below command:
nodetool cfstats
Result: This will return the complete statistics related to available keyspaces.
But, in case you want to find out the statistics of specific keyspaces or tables, run below command:
For Keyspace(s) :
nodetool cfstats <keyspace_name>
OR
nodetool cfstats -H <keyspace_name>
For Table(s) :
nodetool tablestats <keyspace_name>.<table_name>
OR
nodetool tablestats -H <keyspace_name>.<table_name>
Note: -H denotes Human Readable format
For more details please refer, nodetool cfstats
Findings:
You might see
SSTable count
as 0Space used (live)
andSpace used (total)
as 0 bytes
To know WHY(s) of the above two findings please refer: Reason of why SSTable count shown as 0
来源:https://stackoverflow.com/questions/27011886/how-to-know-the-size-of-a-keyspace-and-column-family-in-cassandra