copy from one table to another

Is there any way to copy some part of a table to another table in cassandra? A large amount of data should be copied so i don't want to fetch data to client and stream it back to cassandra using cql. Sent using Zoho Mail

Re: copy from one table to another

If it for testing and you don’t need any specific data, just copy a set of sstables with all files of that sequence and move to target tables directory and rename it. Restart target node or run nodetool refresh Sent from my iPhone > On Apr 8, 2018, at 4:15 AM, onmstester onmstester

Re: copy from one table to another

You can use the same procedure to restore a table from snapshot from datastax webpage https://docs.datastax.com/en/cassandra/2.1/cassandra/operations/ops_backup_snapshot_restore_t.html Just two modifications. after step 5, modify the name of the sstables to add the name of the table you want to

Re: copy from one table to another

You can copy hardlinks to ALL SSTables from old to new table and then delete part of data you do not need in a new one. On Sun, Apr 8, 2018 at 10:20 AM, Nitan Kainth wrote: > If it for testing and you don’t need any specific data, just copy a set of > sstables with all

Re: copy from one table to another

IMHO The best step by step description of what you need to do is here https://issues.apache.org/jira/browse/CASSANDRA-1585?focusedCommentId=13488959=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-13488959 The only difference is that you need to copy data from one

Re: copy from one table to another

Thank you all I need something like this: insert into table test2 select * from test1 where partition_key='SOME_KEYS'; The problem with copying sstable is that original table contains some billions of records and i only want some hundred millions of records from the table, so after

Re: copy from one table to another

If you need this kind of logic, you might want to consider using Spark. It's often used for data migration. You could load your list of partition_key in a Spark RDD, then use joinWithCassandraTable, and write the result back to your destination table. Just before the join, you could use