cassandra-2.0 Questions
2
Solved
I am new to Cassandra, in this example i am using a cluster with 1 DC and 5 nodes and a NetworkTopologyStrategy with replication factor as 3.
Keyspace: activityfeed
Read Count: 0
Read Latency: ...
Calpe asked 15/1, 2015 at 12:53
1
I was importing about 4 million rows from CSV using COPY. 90 minutes into the process, I got the following error which suggests some problem in waiting for replica nodes. The Keyspace is setup with...
Fell asked 18/10, 2015 at 6:4
4
Solved
I would like learn more on cassandra stress tool , like how I can do the stress test and study the result. When cassandra-stress is executed from the cmd where is the keyspace made ,How to view the...
Weep asked 12/3, 2014 at 6:33
1
Solved
How to read the cassandra nodetool histograms percentile and other coulmns?
Percentile SSTables Write Latency Read Latency Partition Size Cell Count
(micros) (micros) (bytes)
50% 1.00 14.24 4055...
Trammel asked 8/1, 2016 at 23:58
1
I'm run Cassandra docker container:
docker pull cassandra
run --name cassandra -p 9042:9042 -p 9160:9160 -d cassandra
The netstat -tpln is:
Proto Recv-Q Send-Q Local Address Foreign Address St...
Smorgasbord asked 7/1, 2016 at 1:21
1
Solved
According to this issue, Cassandra's storage format was updated in 3.0.
If previously I could use cassandra-cli to see how the SSTable is built, to get something like this:
[default@test] list ph...
Shack asked 2/1, 2016 at 20:25
1
Solved
The documentation for nodetool compact says:
This command starts the compaction process on tables that use the
SizeTieredCompactionStrategy and DateTieredCompactionStrategy. You can
specify a ...
Stinking asked 29/12, 2015 at 14:3
2
Solved
I'm new in Cassandra and I've read that Cassandra encourages denormalization and duplication of data. This leaves me a little confused.
Let us imagine the following scenario:
I have a keyspace wit...
Peterpeterborough asked 11/12, 2015 at 20:8
2
I am trying to start Cassandra with SSL. My yam file has
server_encryption_options:
internode_encryption: all
keystore_password: changeme
truststore_password: changeme
truststore: /opt/certs/c...
Ludivinaludlew asked 12/6, 2014 at 22:38
4
Solved
I am trying to spin up a new node using cassandra 2.0.7. Both nodes are at Digital Ocean. The seed node is up and running and I can telnet to port 7000 on that host from the node I'm trying to star...
Chevet asked 26/5, 2014 at 16:15
2
Solved
This behavior in Cassandra seems counter-intuitive and I want to know why this is happening, and possibly work around this.
Imagine I have a table with three columns: pk, the primary key, a text...
Witchcraft asked 3/12, 2014 at 19:50
2
Solved
We're running a copy command in CQLShell on Windows 7. At first, we ran into an "IMPROPER COPY COMMAND":
COPY ourdata(data_time, data_ID, dataBlob)
FROM 'TestData.csv'
WITH HEADER = true;
We lat...
Warhead asked 3/6, 2015 at 17:55
1
I am trying to insert records into Cassandra using a multi threaded Python program. I am running this program simultaneously on 3 machines. For some time being records are getting inserted, but lat...
Glyceric asked 20/11, 2015 at 20:23
1
I am not able to do queries against the Cassandra Node. I am able to make the connection to the cluster and connect. However while doing the the query, it fails
Caused by: com.datastax.driver.core...
Disloyal asked 12/11, 2015 at 0:33
1
I have a 1 node - 1 cluster Cassandra running on my local machine. I want to see how Cassandra scales up, when I simply add the second node to the same cluster. The second node that I am adding wil...
Gujral asked 4/11, 2015 at 1:21
4
We're currently using Hazelcast (http://hazelcast.org/) as a distributed in-memory data grid. That's been working sort-of-well for us, but going solely in-memory has exhausted its path in our use c...
Pianette asked 3/1, 2015 at 10:39
1
Solved
Which is the best python ORM based on Flask framework for Apache Cassandra 2.x?
The ORM you are sugesting, should have best features, like that of pycassa or even more. It will be most useful, if ...
Telford asked 10/9, 2015 at 14:41
2
Solved
Suppose I have a column family:
CREATE TABLE update_audit (
scopeid bigint,
formid bigint,
time timestamp,
record_link_id bigint,
ipaddress text,
user_zuid bigint,
value text,
PRIMARY KEY (...
Alberic asked 17/4, 2015 at 7:19
2
Solved
I was thinking, instead of creating Cassandra table with uuid column if I create a text column , at the end I am going to insert in it Java.util.uuid.random string. So what will be the difference p...
Subjoinder asked 3/9, 2015 at 1:3
3
How can atomic batches guarantee that either all statements in a single batch will be executed or none?
Shelled asked 5/2, 2015 at 16:10
1
I have designed following table to store server alarms:
create table IF NOT EXISTS host_alerts(
unique_key text,
host_id text,
occur_time timestamp,
clear_time timestamp,
last_occur timestamp...
Continence asked 8/8, 2015 at 10:50
3
I'm looking for the best way to de-duplicate events using Cassandra.
I have many clients receiving event id's (thousands per second). I need to ensure that each event id is processed once and only...
Polymer asked 29/7, 2015 at 15:4
3
Solved
I've read quite a few articles and a lot of question/answers on SO about Cassandra but I still can't figure out how Cassandra decides which node(s) to go to when it's reading the data.
First, some...
Bonsai asked 28/7, 2015 at 7:29
1
I have a cassandra cluster with ~20 nodes in multiple datacenters. I want to back up the cassandra database. I want it to be possible to restore the backup to a new cluster even if every node in th...
Nineveh asked 15/7, 2015 at 17:40
4
I am trying to migrate my database from MySQL to Cassasndra. The problem I am facing is with one of the column type defined as Enum (enum('GP','NGP','PGP','PAGP')). Cassandra does not support Enum ...
Highminded asked 8/5, 2014 at 7:15
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