Operation Time Out Error in cqlsh console of cassandra

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I have a three nodes Cassandra Cluster and I have created one table which has more than 2,000,000 rows.

When I execute this (select count(*) from userdetails) query in cqlsh, I got this error:

OperationTimedOut: errors={}, last_host=192.168.1.2

When I run count function for less row or with limit 50,000 it works fine.

count(*) actually pages through all the data. So a select count(*) from userdetails without a limit would be expected to timeout with that many rows. Some details here: http://planetcassandra.org/blog/counting-key-in-cassandra/

You may want to consider maintaining the count yourself, using Spark, or if you just want a ball park number you can grab it from JMX.

To grab from JMX it can be a little tricky depending on your data model. To get the number of partitions grab the org.apache.cassandra.metrics:type=ColumnFamily,keyspace={{Keyspace}},scope={{Table​}},name=EstimatedColumnCountHistogram mbean and sum up all the 90 values (this is what nodetool cfstats outputs). It will only give you the number that exist in sstables so to make it more accurate you can do a flush or try to estimate number in memtables from the MemtableColumnsCount mbean

For a very basic ballpark number you can grab the estimated partition counts from system.size_estimates across all the ranges listed (note that this is only number on one node). Multiply that out by number of nodes, then divided by RF.

Operation Time Out Error in cqlsh console of cassandra, Operation Time Out Error in cqlsh console of cassandra, To change the client timeout limit in Apache Cassandra, there are two techniques: Technique 1:Modify � When I am using spark sql I get an error, below is the Apache Cassandra - cqlsh operation timeout cassandra,cqlsh I am trying to start cqlsh and this is what I get: /bin$ ./cqlsh Connection error: ('Unable to connect to any servers', {'127.0.0.1': OperationTimedOut('errors=None, last_host=None',)}) I tried removing ~/.cassandra, did not work

You can also increase timeout in the cqlsh command, e.g.:

cqlsh --request-timeout 120 myhost

Cassandra CQLSH OperationTimedOut error=Client request timeout , Customize the CQL shell configuration at start up from a properties file. The cqlsh console display and COPY TO date parsing settings. Default: false . timeout: Configures timeout in seconds when opening new number of child worker processes. maxattempts: Maximum number of attempts for errors. Best How To : Depending on your version and configuration, check the values specified for listen_address and/or rpc_address in your cassandra.yaml.If they are defined to anything other than localhost, you will need to provide that address when connecting with cqlsh.

To change the client timeout limit in Apache Cassandra, there are two techniques:

Technique 1:Modify the cqlshrc file.

Technique 2: Open the program cqlsh and modify the time specified using the client_timeout variable.

For details to accomplish please refer the link: https://playwithcassandra.wordpress.com/2015/11/05/cqlsh-increase-timeout-limit/

Configuring cqlsh from a file, A typical query in Cassandra can imply message exchanges across more than two machines. If the driver differentiates between read and write timeout here, this is Most operations are idempotent in Cassandra, but a few aren't: in interactive environments such as cqlsh or DataStax DevCenter. While Cassandra gives you many knobs to tune to get the right performance out of your system, it takes a lot of study, experience or both, to know just how to tune them for your specific hardware

if you use cqlsh: open the script in editor and find all words "timeout". Change default value from 10 to 60 and save the script.

Cassandra error handling done right, The Cassandra Query Language Shell (cqlsh) is an open-source for replica nodes' responses] message="Operation timed out - received� cqlsh is a command line shell for interacting with Cassandra through CQL (the Cassandra Query Language). It is shipped with every Cassandra package, and can be found in the bin/ directory alongside the cassandra executable. cqlsh utilizes the Python native protocol driver, and connects to the single node specified on the command line.

I'm using Cassandra 3.4 and cqlsh to get record counts. It appears that there has been a code change in 3.4. cqlsh just calls cqlsh.py. Inside of cqlsh.py there is a DEFAULT_REQUEST_TIMEOUT_SECONDS variable that defaults to 10 (seconds). I changed it to 3600 (1 hour) and now my SELECT count(*) queries work.

Loading data into Amazon Keyspaces with cqlsh, cqlsh --connect-timeout 10 cassandra.eu-north-1.amazonaws.com 9142 OperationTimedOut('errors=Timed out creating connection (10� cqlsh:tutorialspoint> expand off; Disabled Expanded output. Exit. This command is used to terminate the cql shell. Show. This command displays the details of current cqlsh session such as Cassandra version, host, or data type assumptions. Given below is the usage of this command. cqlsh:tutorialspoint> show host; Connected to Test Cluster at 127

Can't connect via cqlsh (Stockholm, cqlsh is a command line shell for interacting with Cassandra through CQL (the The performance of cqlsh's COPY operations can be improved by installing cython. --connect-timeout: Specify the connection timeout in seconds (defaults to 2s) Errors and output from cqlsh-only commands will still be shown in the cqlsh� The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data.

cqlsh: the CQL shell — Apache Cassandra Documentation v3.11.3, However, sometimes when testing out Cassandra configuration changes or changes to our the same data by querying Cassandra from the CQLSH console app from any node: message= "Operation timed out - received only 0 responses. Also in 1.2, Cassandra provides different timeouts for reads, writes, and other operations such as truncate. The coordinator is in the same situation the client was in during the single-server failure scenario: it doesn't know whether the request succeeded or failed, so all it can tell the client is that the request timed out.

Cassandra, cqlsh is a command line shell for interacting with Cassandra through CQL The performance of cqlsh's COPY operations can be improved by installing cython. --request-timeout: Specify the request timeout in seconds (defaults to 10s) Errors and output from cqlsh-only commands will still be shown in the cqlsh session. i have 3 nodes cassandra cluster , have created 1 table has more 2,000,000 rows.when execute (select count(*) userdetails) query in cqlsh, got error:operationtimedout: errors={}, last_host=192.168.1.2when run count function less row or limit 50,000 works fine. count(*) pages through data.

Comments
  • Please, Can you tell me in some detail to how to get it from JMX ?
  • +1 upvoted. Another alternative (to hold the count on the amount of records) would be to use Cassandra's neat distributed counters for that (in a seperate CF, simply increment it on every insert). You'll need to retrieve the current amount of rows (iterate through it in code for example) to provide the initial seed amount when setting this up.
  • Kinda old for update but after issues.apache.org/jira/browse/CASSANDRA-9107 you can use the org.apache.cassandra.metrics:type=ColumnFamily,keyspace={{Keyspace}},scope={{Table​}},name=EstimatedRowCount (EstimatedPartitionCount in newer versions) to include the number in memtables and will do a better job of getting an approx. row count.
  • how to do that, if your are not relating script to configuration file