I need to get a dump(with data) from remote Cassandra database. I was able to get database schema via following command.How can i get all data in the keyspace?
I'm using Cassandra 1.1.9
echo -e "connect localhost/9260;\r\n use PWC_Keyspace;\r\n show schema;\n" | bin/cassandra-cli -h localhost -port 9260 > dilshan.cdl
With Cassandra 1.1.9, I don't believe you have access to cqlsh with the copy-to command, so you'll be stuck with 2 options.
1) Export the data from the data files (sstables) on disk using sstable2json, or
2) Write a program to iterate over every row and copy/serialize it to a format you find easier to work with.
You MAY be able to use a more recent cqlsh (say, from 2.0, which still used thrift instead of the native interface), and point it at your 1.1.9 server and use 'COPY TO' to export each table to a csv. However, the COPY command in cqlsh for 2.0 doesn't use paging, and cassandra 1.1.19 doesn't support paging, so there's a very good chance it's simply going to time out and fail.
Related
Am trying to export a Cassandra Keyspace plus Data to a file. Is there a cqlsh command that allows the export of all tables + Data at once.?
I used this code to export the keyspace. Now I would like to export all the Data from all the tables into the file.
$ cqlsh -e "DESCRIBE KEYSPACE somekeyspace" > /path/to/somekeyspace.cql
Looking at the DataStax documentation, you should be able to do that using the COPY command as follows (for a single table):
COPY someKeySpace.someTable (someCol1, someCol2)
TO '/path/to/someTable_Col1Col2.csv' WITH HEADER = TRUE;
For all tables, probably you will need to write this code multiple times OR iterate through the tables. You might find this article also useful.
ps. I also found this GitHub repo that seems interesting, but I haven't used it yet myself, so I am suggesting it here for you to maybe give it a try :)
https://github.com/masumsoft/cassandra-exporter
I'm trying to connect to a Datastax Community Edition server 2.1.2 via JDBC but I keep getting the following error no matter what I try to do, even when issuing a very basic command like select * from system_traces.events;
InvalidRequestException(why:Keyspace 'keyspace1' does not exist)
Issuing that same command via cqlsh works properly, so it seems to be a JDBC issue.
InvalidRequestException(why:Keyspace 'keyspace1' does not exist)
at org.apache.cassandra.cql.jdbc.CassandraConnection.<init>(CassandraConnection.java:229):229
at org.apache.cassandra.cql.jdbc.CassandraDriver.connect(CassandraDriver.java:92):92
at java.sql.DriverManager.getConnection(DriverManager.java:664):664
at java.sql.DriverManager.getConnection(DriverManager.java:270):270
at railo.commons.db.DBUtil.getConnection(DBUtil.java:109):109
at railo.runtime.db.DatasourceConnectionPool.loadDatasourceConnection(DatasourceConnectionPool.java:89):89
at railo.runtime.db.DatasourceConnectionPool.getDatasourceConnection(DatasourceConnectionPool.java:81):81
at railo.runtime.db.DatasourceManagerImpl.getConnection(DatasourceManagerImpl.java:65):65
at railo.runtime.tag.Query.executeDatasoure(Query.java:696):696 ...
Any ideas? TIA!
InvalidRequestException(why:Keyspace 'keyspace1' does not exist)
This exception means you are trying to query for a keyspace (in this case "Keyspace1") that hasn't yet been added to Cassandra. Try creating the keyspace before querying it.
You're probably doing a select (SELECT * FROM "Keyspace1"."Standard1") that you're not seeing or passing initialisation parameters to JDBC telling it to connect to Keyspace1. Verify that your code isn't looking for the non-existent keyspace by searching through the queries you have, specifically looking for Keyspace1 (or "Keyspace1" since in this case the keyspace name is case-sensitive).
On a side-note, "Keyspace1"."Standard1" tend to be the standard ks.cf pair used for cassandra examples so it would be good to scan your code for them to make sure that they are created before they are queried.
I am trying to create a table using cqlsh with composite primary key but it doesn't return to the cqlsh prompt. The cqlsh and cassandra versions are cqlsh 3.1.7 | Cassandra 1.2.13.2. Can we not create composite primary key using cqlsh? Have tried Dbeaver but that also fails reporting mismatched input ',' expecting EOF. Are there any other clients that allow to create?
Any suggestions would be helpful.
I tried your CREATE TABLE command on the same version of Cassandra using cql 3 and it just worked. It failed using cql 2.
If you're still using cql 2, that's likely the source of your problem.
I have installed datastax ODBC driver for cassndra and also i have created keyspace and some tables using cql 3. But ODBC driver is not showing up those tables.
Also in odbc documentation i read that the driver does not currently support version 3.0 of the Cassandra Query Language (CQL3) and the driver will not recognize keyspaces and column families that are defined with CQL 3.
So in order to use cql 2 i am using following command which is suggested in driver documentation:
...\cqlsh” -2
But this is giving an error saying "cqlsh: error: no such option: -2"
Can anybody help me out with this?
cql2 is deprecated and was removed from cslqh in Cassandra 2.0. It will be removed from the server as well in 3.0.
I do not know when cql3 support will be added to the ODBC driver.
The documentation is not correct regarding how to start cqlsh using a previous spec/version...you need to use --cqlversion instead of -2 (see notes below). However, as mentioned in jbellis' answer cql2 support has been removed from later versions of cassandra.
CQL Shell for Apache Cassandra
Options:
--version show program's version number and exit
-h, --help show this help message and exit
-C, --color Always use color output
--no-color Never use color output
-u USERNAME, --username=USERNAME
Authenticate as user.
-p PASSWORD, --password=PASSWORD
Authenticate using password.
-k KEYSPACE, --keyspace=KEYSPACE
Authenticate to the given keyspace.
-f FILE, --file=FILE Execute commands from FILE, then exit
-t TRANSPORT_FACTORY, --transport-factory=TRANSPORT_FACTORY
Use the provided Thrift transport factory function.
--debug Show additional debugging information
--cqlversion=CQLVERSION
Specify a particular CQL version (default: 3.1.1).
Examples: "3.0.3", "3.1.0"
-e EXECUTE, --execute=EXECUTE
Execute the statement and quit.
I have a counter column family in cassandra. When i try to view the data from CQL i get an error even though there is data in the column family.
SELECT * from userstats;
Generates the following error:
'int' object has no attribute 'replace'
I can confirm that the data is in the column family and is working properly since I can view the data with the Datastax Opscenter data explorer.
It sounds like you're using an older version of cqlsh. Upgrading it (just copying the bin/cqlsh file from the Cassandra 1.1 branch head, along with everything under the pylib directory, into place) ought to solve this.
If it doesn't, running cqlsh with --debug would help a lot in diagnosing the problem.