user@cassandra.apache.org discussions

2	Cassandra Start script not working

Hi, I downloaded Cassandra 3.6/3.7 and on my OSX machine having Java 1.8.0_45, I can't launch whenever I try to launch it using "bin/cassandra -f" it gives me error "Error: Could not find or load ...

Ali
Jun 18, 2016 at 1:31 am
Jun 18, 2016 at 9:30 am

8	Understanding when Cassandra drops expired time series data

Hello! Recently I have been trying to familiarize myself with Cassandra but don't quite understand when data is removed from disk after it has been deleted. The use case I'm particularly interested ...

Jerome
Jun 17, 2016 at 6:52 pm
Jun 17, 2016 at 8:47 pm

4	Multi-DC Cluster w/ non-replicated Keyspace

Hi Guys, We have a 2 DC cluster where the keyspaces are replicated between the 2. Is it possible to add a keyspace to one of the DCs that won't be replicated to the other? Whenever we add a new ...

Jason J. W. Williams
Jun 17, 2016 at 1:48 am
Jun 17, 2016 at 2:09 am

7	Backup strategy

Hi , I'm from relational world recently started working on Cassandra. I'm just wondering what is backup best practices for DB around 100 Tb with multi DC setup. Thanks, Vasu

Vasu Nosql
Jun 16, 2016 at 10:33 pm
Jun 16, 2016 at 11:41 pm

2	StreamCoordinator.ConnectionsPerHost set to 1

Hello, I noticed that StreamCoordinator.ConnectionsPerHost is always set to 1 (Cassandra 2.1.13). If I am reading the code correctly, this means there will always be just one socket (well, 2 ...

Anubhav Kale
Jun 16, 2016 at 5:44 pm
Jun 17, 2016 at 5:35 pm

0	Are you using Cassandra to record user analytics?

I'm interested in hearing how you may be using Cassandra to capture user analytics and some design choices you've made. At a high level, I'm considering the following: web application - kafka - ...

Richard L. Burton III
Jun 15, 2016 at 7:32 pm
Jun 15, 2016 at 7:32 pm

5	how to force cassandra-stress to actually generate enough data

Hi, The cassandra-stress is not helping really to populate the disk sufficiently. I tried several table structures, providing cluster: UNIFORM(1..10000000000) on clustering parts of the PK. Partition ...

Peter Kovgan
Jun 15, 2016 at 12:25 pm
Jun 17, 2016 at 7:22 am

1	Cqlsh Questions

Couple of Cqlsh questions: 1) Why when I run the DESCRIBE CLUSTER command no snitch information is required? Is this because my Cassandra cluster is a single node? 2) When I run the HELP ...

Steve Anderson
Jun 15, 2016 at 11:28 am
Jun 15, 2016 at 1:18 pm

4	Reason for Trace Message Drop

Hi all, Can anyone tell me that what are all possible reasons for below log:- *"INFO [ScheduledTasks:1] 2016-06-14 06:27:39,498 MessagingService.java:929 - _TRACE messages were dropped in last 5000 ...

Varun Barala
Jun 15, 2016 at 9:23 am
Jun 17, 2016 at 3:57 am

6	Data lost in Cassandra 3.5 single instance via Erlang driver

Hi, I use Erlang driver to send data to Cassandra, do testing at local environment meet data lost issue. I have no idea what step is wrong. *Environment:* 1. Ubuntu 12.04 LTS x64bit 2. Cassandra 3.5 ...

Linbo liao
Jun 15, 2016 at 2:55 am
Jun 15, 2016 at 1:14 pm

9	Cassandra monitoring

What are the options for a very small and nimble startup to do keep a cassandra cluster running well oiled. We are on AWS. We are interested in a monitoring tool and potentially also cluster ...

Arun Ramakrishnan
Jun 14, 2016 at 7:10 pm
Jun 15, 2016 at 1:33 pm

0	[RELEASE] Apache Cassandra 3.0.7 released

The Cassandra team is pleased to announce the release of Apache Cassandra version 3.0.7. Apache Cassandra is a fully distributed database. It is the right choice when you need scalability and high ...

Jake Luciani
Jun 14, 2016 at 2:15 pm
Jun 14, 2016 at 2:15 pm

0	[RELEASE] Apache Cassandra 3.7 released

The Cassandra team is pleased to announce the release of Apache Cassandra version 3.7. Apache Cassandra is a fully distributed database. It is the right choice when you need scalability and high ...

Jake Luciani
Jun 14, 2016 at 2:15 pm
Jun 14, 2016 at 2:15 pm

11	Spark Memory Error - Not enough space to cache broadcast

Hi, I'm using spark 1.5.1 version. I am reading data from Kafka into Spark and writing it into Cassandra after processing it. Spark job starts fine and runs all good for some time until I start ...

Cassa L
Jun 13, 2016 at 9:56 pm
Jun 16, 2016 at 9:25 pm

2	How to print out the metrics information, like compaction and garbage collection?

Hi there, I've deployed 6 node in Amazon EC2. I'm trying to monitor some metrics for each node and print them out when I write/read data into Cassandra. Specifically I want to print out the ...

Jun Wu
Jun 13, 2016 at 9:18 pm
Jun 14, 2016 at 7:25 pm

1	Tick Tock version numbers

I have a small, 3 machine, cluster with 3.2.1 Can I upgrade them to 3.6 from 3.2? Or is it advisable to upgrade to each intermediary version? Based on what I have gather seems like it is matter of ...

Francisco Reyes
Jun 13, 2016 at 4:59 pm
Jun 14, 2016 at 4:22 pm

10	Why there is no native shutdown command in cassandra

Hi All Why we dont have native shutdown command in Cassandra ? Every software provides graceful shutdown command. Regards, Anshu

Anshu Vajpayee
Jun 13, 2016 at 4:28 pm
Jun 13, 2016 at 7:28 pm

4	Installing Cassandra from Tarball

I am trying out Cassandra and have installed it on a single Amazon Linux AMI instance (. I downloaded the Cassandra 3.6 tarball. However when I run Cassandra I notice there are the following ...

Steve Anderson
Jun 13, 2016 at 4:16 pm
Jun 14, 2016 at 5:37 pm

17	select query on entire primary key returning more than one row in result

Hi, We are facing this issue on production, We upgraded our cassandra from 3.0.3 to 3.5 When we ran a query with partition key and clustering column(entire primary key specified), we get 16 rows in ...

Siddharth Verma
Jun 13, 2016 at 12:39 pm
Jun 15, 2016 at 4:17 am

4	Streaming from 1 node only when adding a new DC

Hello, We've tested adding a new DC from an existing DC having 3 nodes and RF=3 (ie all nodes have all data). During the rebuild process, only one node of the first DC streamed data to the 3 nodes of ...

Fabien Rousseau
Jun 13, 2016 at 9:02 am
Jun 16, 2016 at 9:19 am

1	sstabledump failing for system keyspace tables

I have been trying to obtain json dump of batches table using sstabledump but I get this exception: $ sstabledump /sstable/data/system/batches-919a4bc57a333573b03e13fc3f68b465/ma-277-big-Data.db ...

Bhuvan Rawal
Jun 11, 2016 at 8:00 pm
Jun 11, 2016 at 8:58 pm

5	java.lang.OutOfMemoryError: Java heap space

Hi, I've been googling various parts of this all day but none of the suggestions seem to fit. I have 2 nodes, one of which is a seed. I'm trying to add a third node but, after a few minutes in the UJ ...

Tobin Landricombe
Jun 10, 2016 at 3:11 pm
Jun 13, 2016 at 5:58 pm

2	Empty snapshot created

Hi, I am facing an issue when taking snapshots. The details of the setup are as follows 1. Cassandra Version 3.5 2. I have a keyspace named *other_map* with '*NetworkTopologyStrategy*' and ...

Mradul Maheshwari
Jun 10, 2016 at 4:17 am
Jun 10, 2016 at 4:41 am

5	Interesting use case

We have a use case where we are storing event data for a given system and only want to retain the last N values. Storing extra values for some time, as long as it isn’t too long, is fine but never ...

John Thomas
Jun 8, 2016 at 7:03 pm
Jun 10, 2016 at 2:54 pm

4	Nodetool repair inconsistencies

I am running a 3 node cluster of 3.0.6 instances and encountered an error when running nodetool compact. I then ran nodetool repair. No errors were returned. I then attempted to run nodetool compact ...

Jason Kania
Jun 8, 2016 at 1:34 am
Jun 8, 2016 at 5:12 pm

1	Cassandra 3.6: Compaction/Write Requests fail with org.xerial.snappy.SnappyError: [NOT_A_DIRECT_BUFFER] destination is not a direct buffer

Has anyone seen this issue since upgrading to 3.6? I don't have a good idea what is going on yet, as my logs have just been spewing the following error. WARN [SharedPool-Worker-174] 2016-06-07 ...

Nimi Wariboko Jr
Jun 7, 2016 at 11:58 pm
Jun 8, 2016 at 12:31 am

0	Can you enable Thrift on a node and still connect remotely to it using CQL/port 9042?

Hello, I have a question. I have changed the Cassandra driver (3.0.0) so we can connect to and query two nodes (Cassandra 3.2.1), the local one and a remote node, using the driver's native protocol ...

Carolina Simoes Gomes
Jun 7, 2016 at 11:33 pm
Jun 7, 2016 at 11:33 pm

3	Lightweight Transactions during datacenter outage

Hi, I have a cluster spreaded among 2 datacenters (DC1 and DC2), two server on each DC and I have a keyspace with NetworkTopologyStrategy (DC1:2 and DC2:2) with the following table: CREATE TABLE test ...

Jeronimo de A. Barros
Jun 7, 2016 at 5:26 pm
Jun 8, 2016 at 4:46 pm

6	Change authorization from AllowAllAuthorizer to CassandraAuthorizer

Hi guys, I have a Cassandra 2.1.8 Community cluster running with AllowAllAuthorizer and have to change it, so I can implement permissions in different users. As I've checked in the docs, seems like a ...

Felipe Esteves
Jun 7, 2016 at 4:06 pm
Jun 8, 2016 at 6:21 pm

2	Unable to use native library in C* trigger

Hi, all, I am attempting write a trigger that depends on a native library. The library is successfully loaded by the JVM (so the java.library.path should not be the issue - I just have the jnilib in ...

Brian Kelly
Jun 7, 2016 at 3:07 pm
Jun 8, 2016 at 5:51 pm

2	How to remove 'compact storage' attribute?

Hi, All, Since the Astyanax client has been EOL, we are considering to migrate to Datastax java client in our product. One thing I notice is that the CFs created by Astyanax have 'compact storage' ...

Lu, Boying
Jun 7, 2016 at 8:51 am
Jun 12, 2016 at 8:05 am

0	Gossip Behavioral Difference between C* 2.0 and C* 2.1

Hi, We recently discovered that there are some differences in gossip behavior between C* 2.0 and C* 2.1. In some cases of network instability or a node reboot, we can observe some behavioral ...

Michael Fong
Jun 7, 2016 at 2:58 am
Jun 7, 2016 at 2:58 am

0	[RELEASE] Apache Cassandra 3.6 released

The Cassandra team is pleased to announce the release of Apache Cassandra version 3.6. Apache Cassandra is a fully distributed database. It is the right choice when you need scalability and high ...

Jake Luciani
Jun 6, 2016 at 8:21 pm
Jun 6, 2016 at 8:21 pm

0	Cassandra SSTables' metadata and corruption

Hello C*-users community, I have a question about Cassandra data files corruption. In one of our test clusters (which runs *C* 2.1*), we observed that when we run the tool *'sstablemetada'* on one of ...

Rajath Subramanyam
Jun 6, 2016 at 8:06 pm
Jun 6, 2016 at 8:06 pm

0	Help regarding cassandra node networking..

I'm creating a cassandra cluster. I've three node with centos 7 and cassandra 3.4 installed. Node0 interfaces: eth0 169.254.169.xx1 (Public IP) eth1 192.168.56.101(Private IP) Node1 interfaces: eth0 ...

Sahriar rahman supto
Jun 6, 2016 at 7:27 am
Jun 6, 2016 at 7:27 am

3	Subscribe to Cassandra Commit Log

Hi All, I am around with a use case to extract/fetch the Cassandra specific Insert/update events, had been through a project on github( https://github.com/carloscm/cassandra-commitlog-extract) but I ...

Vineet Mishra
Jun 5, 2016 at 4:34 pm
Jun 7, 2016 at 3:35 pm

1	Wireshark and CQL

Hi List, I am from ScyllaDB and took some time to iterate on the wireshark CQL dissector that was previously written by Aaron Ten Clay. The result is that wireshark upstream now have a fully working ...

Benoît Canet
Jun 5, 2016 at 10:46 am
Jun 7, 2016 at 3:49 am

2	how long does "nodetool upgradesstables" take?

I just upgrade C* from 2.2.4 to 2.2.6. I ran "nodetool upgradesstables" and it returned within a few seconds. Does this sound right? A few questions: 1. is it possible that sstable formats are the ...

Kai Wang
Jun 4, 2016 at 4:36 pm
Jun 4, 2016 at 9:51 pm

1	How to include all dependencies on cassandra driver jar?

Hello, I am using Cassandra 3.2.1 and the 3.0.0 driver. I need to build the driver but with all its dependencies included in the jar (uber jar), using maven, such that there are no external ...

Carolina Simoes Gomes
Jun 4, 2016 at 1:08 am
Jun 4, 2016 at 1:09 am

0	ANNOUNCE: Hecate 3.0.0.Beta1 Available...

Fellow Cassandra Users, We have been using a library we call "Hecate" to do Cassandra ORM-type mapping for our clients for quite some time with tremendous success. We have recently released a ...

James Carman
Jun 3, 2016 at 4:22 pm
Jun 3, 2016 at 4:22 pm

1	Blob or columns

Hi Everyone, We have a unique situation at my workplace while storing data. We are using Cassandra as a write through cache where we keep real time data in Cassandra for around 10 - 20 days and rest ...

Abhinav Solan
Jun 3, 2016 at 3:43 pm
Jun 3, 2016 at 9:55 pm

1	Incorrect progress percentage while repairing

Hi, While running incremental (parallel) repairs on the first partition range (-pr), I rarely see the progress percentage going over 20%/25%. 2016-06-02 14:12:23,207] Repair session ...

Stefano Ortolani
Jun 2, 2016 at 2:55 pm
Jun 2, 2016 at 3:38 pm

0	Upgredesstables doing 4K reads

Hi, I've got a 6 node C* cluster (all nodes are equal both in OS and HW setup, they are DL380 Gen9 with Smart Array RAID 50,3 on SAS 15K HDDs) which has been recently updated from 2.2.5 to 3.5. As ...

Jacek Luczak
Jun 2, 2016 at 11:43 am
Jun 2, 2016 at 11:43 am

1	Library/utility announcements?

Some user lists allow it. Does the Cassandra community mind folks announcing their super cool Cassandra libraries on this list? Is there a page for us to list them?

James Carman
Jun 1, 2016 at 11:48 pm
Jun 2, 2016 at 3:24 pm

2	Token Ring Question

Hello, I recently learnt that regardless of number of Data Centers, there is really only one token ring across all nodes. (I was under the impression that there is one per DC like how Datastax Ops ...

Anubhav Kale
Jun 1, 2016 at 7:41 pm
Jun 3, 2016 at 10:17 pm

0	Timeout while waiting for workers when flushing pool

We have a 4 nodes, two dc's test cluster. All of them have datastax enterprise installed and running. One dc is the Cassandra dc, and the other is the Solr dc. We first used sstableloader to stream 1 ...

Zhang, Charles
Jun 1, 2016 at 2:55 pm
Jun 1, 2016 at 2:55 pm

0	Does sstableloader still use gossip?

Hi, in the docs it still says that the sstableloader still uses gossip ( https://docs.datastax.com/en/cassandra/2.1/cassandra/tools/toolsBulkloader_t.html ...

Matthias Niehoff
May 31, 2016 at 3:02 pm
May 31, 2016 at 3:02 pm

1	a question to Stratio's Cassandra Lucene Index

Hi, All, We are considering to support more flexible searching on data in the Cassandra DB (used in our product). For example, full-text search and query data based on different columns. After some ...

Lu, Boying
May 31, 2016 at 9:27 am
May 31, 2016 at 10:20 am

9	Cassandra 2.1: Snapshot data changing while transferring

Hi there, i am sometimes running in very strange errors while backing up snapshots from a cassandra cluster. Cassandra version: 2.1.11 What i basically do: 1. nodetool snapshot 2. tar all snapshot ...

Paul Dunkler
May 31, 2016 at 9:03 am
Jun 7, 2016 at 9:28 am

1	Time series data with only inserts

Let us assume that there is a table which gets only inserts and under normal circumstances no reads on it. If we assume TTL to be 7 days, what event will trigger a compaction/purge of old data if the ...

Rakesh Kumar
May 30, 2016 at 10:55 pm
May 31, 2016 at 4:26 am

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