Hi, All,
I'm new to Cassandra. I want to know how to add a DC to existing Cassandra
cluster (all running Cassandra 2.x).
I found a related document at
http://www.datastax.com/docs/1.1/cluster_management
Is it still valid for Cassandra 2.x?
Thanks
Boying
Thanks a lot :)
From: Robert Coli [mailto:rc...@eventbrite.com]
Sent: 2014年1月24日 4:54
To: user@cassandra.apache.org
Subject: Re: How to add a new DC to cluster in Cassandra 2.x
On Tue, Jan 21, 2014 at 7:16 AM, Tupshin Harper
tups...@tupshin.commailto:tups...@tupshin.com wrote:
This should be
Hi, All,
When I read the codes of OutboundTcpConnection.expireMessages(), I found the
following snippet in a loop:
if (qm.timestamp = System.currentTimeMillis() - qm.message.getTimeout())
return;
My understanding is that this method is to remove all the expired messages
Hi, All,
I'm using Netflix/Astyanax as a java cassandra client to access Cassandra DB.
I need to paginate through all columns in a row and I found the document at
https://github.com/Netflix/astyanax/wiki/Reading-Data
about how to do that.
But my requirement is a little different. I don't want
this is a bit
different but I hope this shows you the general idea.
T#
On Thu, Feb 27, 2014 at 11:36 AM, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Hi, All,
I’m using Netflix/Astyanax as a java cassandra client to access Cassandra DB.
I need to paginate through all columns in a row
Hi, All,
I need to paginate all columns in a row. but can not to use
RowQuery.autoPaginate() method to do this
due to some requirements.
All columns are composite column and I need to get next 'page' by a separated
query.
Here is my pseudo codes (page size =3):
ColumListC result =
Hi, All,
Does anyone know how many Datacenters Cassandra supports?
Thanks
Boying
Hi, experts,
I need to query all columns of a row in a column family that meet some
conditions (see below). The column is composite column and has following
format:
component1component2compoment3... where componentN has String type.
What I want to do is to find out all columns that meet
Hi, experts,
Since the Cassandra 2.x supports DB that across multiple DCs, my question is
how many DCs can Cassandra support in practice?
Thanks
Boying
:26 AM, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Hi, experts,
Since the Cassandra 2.x supports DB that across multiple DCs, my question is
how many DCs can Cassandra support in practice?
Thanks
Boying
Hi, All,
I wonder if I can change the seeds list at runtime. i.e. without change the
yaml file and restart DB service?
Thanks
Boying
Hi, All,
I need to add a Cassandra (running on a three nodes) fresh installed in a
datacenter say DC3 to existing Cassandra datacenters say DC1 and DC2.
I read the document about it at
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html
But I
Hi, All,
I use the astyanax 1.56.48 + Cassandra 2.0.6 in my test codes and do some query
like this:
query = keyspace.prepareQuery(..).getKey(...)
.autoPaginate(true)
.withColumnRange(new RangeBuilder().setLimit(pageSize).build());
ColumnListIndexColumnName result;
result=
Hi, All,
I need to remove a Cassandra data center from a set of connected Cassandra data
centers (I use Cassandra 2.0.7).
I found a related document at
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_decomission_dc_t.html
But I need to do these in my Java programs.
Hi, All,
I need to make a Cassandra keyspace to be read-only.
Does anyone know how to do that?
Thanks
Boying
?
Boying
From: Vivek Mishra [mailto:mishra.v...@gmail.com]
Sent: 2014年7月17日 18:35
To: user@cassandra.apache.org
Subject: Re: How to prevent writing to a Keyspace?
Think about managing it via authorization and authentication support
On Thu, Jul 17, 2014 at 4:00 PM, Lu, Boying
boying
. That way user cannot modify data in
specific keyspace or column family.
http://www.datastax.com/documentation/cql/3.0/cql/cql_reference/grant_r.html
-Vivek
On Mon, Jul 21, 2014 at 7:57 AM, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Thanks a lot ☺
But I think authorization
Hi, All,
I want to run 'update keyspace with strategy_options={dc1:3, dc2:3}' from
cassandra-cli to update the strategy options of some keyspace
in a multi-DC environment.
When the command returns successfully, does it mean that the strategy options
have been updated successfully or I need to
To: user
Subject: Re: A question about using 'update keyspace with strategyoptions'
command
Try the show keyspaces command and look for Options under each keyspace.
Thanks
Rahul
On Tue, Aug 5, 2014 at 2:01 PM, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Hi, All,
I want to run
Changing the strategy options, and in particular the replication factor, does
not perform any data replication by itself. You need to run a repair to ensure
data is replicated following the new replication.
On Tue, Aug 5, 2014 at 10:52 AM, Lu, Boying
boying...@emc.commailto:boying...@emc.com
...@datastax.com wrote:
On Tue, Aug 5, 2014 at 11:40 AM, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
What I want to know is “are the strategy changed ?’ after the ‘udpate keyspace
with strategy_options…’ command returns successfully
Like all schema changes, not necessarily on all nodes
Hi, All,
We are using Cassandra 2.0.7 in a multi DCs environments. If a connected DC is
powered off, we use the 'nodetool removenode' command to remove it from the
connected DCs.
But we found that once the disconnected DC is powered on, it will connect to
other DCs automatically.
How can we
:
http://www.datastax.com/documentation/cassandra/1.2/cassandra/configuration/configCassandra_yaml_r.html
-- artur
On 14/08/14 06:48, Lu, Boying wrote:
Hi, All,
We are using Cassandra 2.0.7 in a multi DCs environments. If a connected DC is
powered off, we use the ‘nodetool removenode’ command
Hi, All,
We have a Cassandra 2.0.7 running in three connected DCs, say DC1, DC2 and DC3.
DC3 is powered off, so we run 'nodetool removenode' command on DC1 to remove
all nodes of DC3.
Do we need to run the same command on DC2?
Thanks
Boying
then remove all nodes in DC3 via nodetool
removenode from a node in DC1, all nodes in both DC1 and DC2 will be informed
of the nodes removal so no need to run it from a node in DC2.
Mark
On Thu, Aug 14, 2014 at 10:20 AM, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Hi, All,
We have
Hi, All,
I use the following configuration (in yaml file) to enable the client-to-node
encryption:
client_encryption_options:
enabled: true
keystore: path-to-keystore-file
keystore_password: some-password
truststore: path-to-truststore-file
truststore_password: some-password
But
-download-432124.html
Bulat
On Sep 26, 2014, at 7:58, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Hi, All,
I use the following configuration (in yaml file) to enable the client-to-node
encryption:
client_encryption_options:
enabled: true
keystore: path-to-keystore-file
Hi, All,
I want to enable client-to-node encrypt communication, I read some related
documents.
I need to set the following changes in the server side (in yaml):
client_encryption_opitons:
enabled : true
keystore: conf/.keystore
keystore_password: some-password
truststore:
Hi, All,
I'm trying to enable client-to-node encrypt communication in Cassandra (2.0.7)
with Astyanax client library (version=1.56.48)
I found the links about how to enable this feature:
http://www.datastax.com/documentation/cassandra/2.0/cassandra/security/secureSSLClientToNode_t.html
But this
Hi, all,
I read the document about how to adding a new data center to existing clusters
posted at
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html
But I have a question: Are all those steps executed only at the new adding
cluster or on
Step 6 - New DC
Step 7 - New DC
Step 8 - New DC
Mark
On 21 November 2014 03:27, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Hi, all,
I read the document about how to adding a new data center to existing clusters
posted at
http://www.datastax.com/documentation/cassandra/2.0
or on the new datacenter:
Step 1 - Current DC
Step 2 - New DC
Step 3 - Depending on the snitch you may need to make changes on both the
current and new DCs
Step 4 - Client config
Step 5 - Client config
Step 6 - New DC
Step 7 - New DC
Step 8 - New DC
Mark
On 21 November 2014 03:27, Lu, Boying
boying
.
References:
How cqlsh picks up ssl
optionshttps://github.com/apache/cassandra/blob/cassandra-2.1/pylib/cqlshlib/sslhandling.py
Example cqlshrc
filehttps://github.com/apache/cassandra/blob/cassandra-2.1/conf/cqlshrc.sample
Adam Holmberg
On Wed, Jan 28, 2015 at 1:08 AM, Lu, Boying
boying
:15 AM, Lu, Boying
boying...@emc.commailto:boying...@emc.com wrote:
Hi, Holmberg,
I tried your suggestion and run the following command:
keytool –exportcert –keystore path-to-my-keystore-file –storepass
my-keystore-password –storetype JKS –file path-to-outptfile and
I got following error:
keytool
Hi, All,
Does anyone know the answer?
Thanks a lot
Boying
From: Lu, Boying
Sent: 2015年1月6日 11:21
To: user@cassandra.apache.org
Subject: How to use cqlsh to access Cassandra DB if the
client_encryption_options is enabled
Hi, All,
I turned on the dbclient_encryption_options like
.
References:
How cqlsh picks up ssl
optionshttps://github.com/apache/cassandra/blob/cassandra-2.1/pylib/cqlshlib/sslhandling.py
Example cqlshrc
filehttps://github.com/apache/cassandra/blob/cassandra-2.1/conf/cqlshrc.sample
Adam Holmberg
On Wed, Jan 28, 2015 at 1:08 AM, Lu, Boying
boying
Hi, All,
I turned on the dbclient_encryption_options like this:
client_encryption_options:
enabled: true
keystore: path-to-my-keystore-file
keystore_password: my-keystore-password
truststore: path-to-my-truststore-file
truststore_password: my-truststore-password
...
I can use following
Hi, All,
Does anyone know the roadmap of Cassandra 3.0?
Thanks
Boying
Thanks a lot :)
From: Yoshi Kimoto [mailto:yy.kim...@gmail.com]
Sent: 2015年6月24日 12:12
To: user@cassandra.apache.org
Subject: Re: Is there any roadmap of Cassandra 3.0?
Looking for this? Or something else?
http://planetcassandra.org/blog/cassandra-2-2-3-0-and-beyond/
On 2015/06/24 12:42, Lu
Hi, All,
We plan to upgrade Cassandra from 2.0.17 to 2.1.11 (the latest stable release
recommended to be used in the product environment) in our product.
Currently we are using Astyanax 1.56.49 as Java client, I found there are many
new Astyanax at https://github.com/Netflix/astyanax/releases
Hi, All,
Can anyone give some suggestions about the
https://issues.apache.org/jira/browse/CASSANDRA-10420 ?
We are waiting for a solution of it.
Thanks
Boying
Hi, All,
We have an Cassandra environment with two connected DCs and our consistency
level of writing operation is EACH_QUORUM.
So if one DC is down, the write will be failed and we get
TokenRangeOfflineException on the client side (we use netfilix java client
libraries).
We want to give more
Hi, All,
The latest stable release of Cassandra is 2.2.1 and I notice the following line
in the "Requirements" section of README.asc comes with the source codes:
Java >=1.7 (OpenJDK and Oracle JVMS have been tested)
Does this mean that Cassandra 2.2.1 (binary release) can work with Java 7?
Hi, All,
We plan to upgrade Cassandra from 2.0.17 to the latest release 2.2.3 in our
product.
We use:
/**
* Same as forceRepairAsync, but handles a specified range
*/
public int forceRepairRangeAsync(String beginToken, String endToken, final
String keyspaceName, boolean isSequential,
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'
attribute which prevent us from
using some new features provided by CQL such as secondary index.
://issues.apache.org/jira/browse/CASSANDRA-10857
Note that secondary indexes don't scale. Be aware of their limitations.
If you want to change the data model of a CF, a Spark job can do the trick.
Best,
Romain
Le Mardi 7 juin 2016 10h51, "Lu, Boying"
<boying...@emc.com<mailto:boying...@emc.com
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 investigating, I found
but then we'll need to update the binary
protocol. Just create a JIRA and ask for this feature
On Tue, May 10, 2016 at 5:00 AM, Lu, Boying
<boying...@emc.com<mailto:boying...@emc.com>> wrote:
Thanks very much.
I understand that the data needs to be read from the DB to get the next
dHi, All,
We are considering to use DataStax java driver in our codes. One important
feature provided by the driver we want to use is 'paging'.
But according to the
https://datastax.github.io/java-driver/3.0.0/manual/paging/, it seems that we
can't jump between pages.
Is it possible to just
d the paging states for page
1, 2 and 3. Since there are concurrent inserts on the cluster at the same time,
when you re-use the paging state 2 for example, you may not get the same
results as the previous read.
And it is inevitable in an eventual consistent distributed DB world
On Mon, May 9, 2
月18日 18:44
To: user@cassandra.apache.org
Subject: Re: A question to updatesstables
Replies inline
Carlos Alonso | Software Engineer | @calonso<https://twitter.com/calonso>
On 18 August 2016 at 11:56, Lu, Boying
<boying...@emc.com<mailto:boying...@emc.com>> wrote:
Hi, All,
2016 11h32, "Lu, Boying"
<boying...@emc.com<mailto:boying...@emc.com>> a écrit :
Here is the error message in our log file:
java.lang.RuntimeException: Incompatible SSTable found. Current version ka is
unable to read file:
/data/db/1/data/StorageOS/RemoteD
have one time seen an issue with commit log archiving preventing a
startup during upgrade. Usually there is something else broken and the version
mismatch is a false signal.
Regards,
Ryan Svihla
On Aug 18, 2016, at 10:18 PM, Lu, Boying
<boying...@emc.com<mailto:boying...@emc.com>> w
Hi, All,
We use Cassandra 2.1.11 in our product and I tried its sstable2json to dump
some sstable file like this:
sstable2json full-path-to-sstable-file (e.g. xxx-Data.db).
But I got an assert error at "assert initialized ||
keyspaceName.equals(SYSTEM_KS);" (Keyspace.java:97).
The
Hi, All,
We use Cassandra in our product. I our early release we use Cassandra 1.2.10
whose SSTable is 'ic' format.
We upgrade Cassandra to 2.0.10 in our product release. But the Cassandra server
failed to start due to the
incompatible SSTable format and the log message told us to use 'nodetool
Hi, All,
Will the Cassandra generates a new tombstone when updating a column by using
CQL update statement?
And is there any way to get the number of tombstones of a column family since
we want to void generating
too many tombstones within gc_grace_period?
Thanks
Boying
Thanks a lot for your help.
We are using STCS strategy and not using TTL
Is there any API that we can use to query the current number of tombstones in a
CF?
From: Anuj Wadehra [mailto:anujw_2...@yahoo.co.in]
Sent: 2016年11月14日 22:20
To: user@cassandra.apache.org
Subject: Re: Some questions to
m,scope=,type=ColumnFamily
Max/Count/99thPercentile/Mean
2016-11-15 10:05 GMT+01:00 Lu, Boying
<boying...@dell.com<mailto:boying...@dell.com>>:
Thanks a lot for your help.
We are using STCS strategy and not using TTL
Is there any API that we can use to query the current number
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