Do you also store events in Cassandra? If yes, why not to add "processed" flag
to existing table(s), and fetch non-processed events with single SELECT?
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On Fri, 24 Feb 2017 06:24:09 -0500 Vincent Ri
Yes, you can. It's just hardlinks to tables files, so if some file is still
active it will remain intact.
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On Mon, 27 Feb 2017 09:27:50 -0500 Kunal Gangakhedkar
kgangakhed...@gmail.com wrote
Hi all
as well (look at the end of cassandra-env.sh).
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On Wed, 05 Oct 2016 01:46:33 -0400 Mehdi Bada
mehdi.b...@dbi-services.com wrote
Be sure, it's for. Test
or not, etc. Can you give more detail about your network environment?
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On Tue, 04 Oct 2016 14:03:42 -0400 Mehdi Bada
mehdi.b...@dbi-services.com wrote
Thanks
not demand.
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On Tue, 04 Oct 2016 14:51:59 -0400 Benjamin Roth
benjamin.r...@jaumo.com wrote
Of course, just add aliases to your interfaces (like eth0:0
Each table has unique id (suffix). If you drop and then recreate table with the
same name it gets new id.
Try
SELECT keyspace_name, table_name, id FROM system_schema.tables ;
to determinate actual ID.
You can limit request to specific keyspace or table.
Best regards, Vladimir Yudovin
Page cache is data pending flush to disk and data cached from disk.
Do you mean file cache?
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On Sat, 08 Oct 2016 13:40:19 -0400 Ariel Weisberg
ar...@weisberg.ws
Yes, look at this example. But you need to add 'fake' partition with the same
value for all rows, that will cause them to be stored on the same nodes.
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On Sat, 08
Probably those without suffix were created by previous Cassandra version
(somewhere in 2.x series)
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On Sun, 09 Oct 2016 01:58:07 -0400 Jason Kania
jason.ka
: code=2200 [Invalid query] message="Partition
key parts: id2 must be restricted as other parts are"
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On Sun, 09 Oct 2016 00:27:12 -0400 Graham Sandersongra..
-a-development-tool-for-creating-local-cassandra-clusters
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On Tue, 04 Oct 2016 15:36:23 -0400 Mehdi Bada
mehdi.b...@dbi-services.com wrote
I want to run
Actually the main port is 9042 - for client (CQL) connections and 7000 (7001 if
SSL enabled) for inter node communications.
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On Tue, 04 Oct 2016 11:36:04 -0400
Hi Benjamin!
we now use CS 3.x and have been advised that 3.x is still not considered
really production ready.
Did you consider using of 3.0.9? Actually it's 3.0 with almost an year fixes.
Best regards, Vladimir Yudovin,
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Would you consider 3.0.x to be more stable than 3.x?
I guess yes, but there are some discussion on this list:
(C)* stable version after 3.5
Upgrade from 3.0.6 to 3.7.
It seems to be eternal topic till tick-tock approach stabilizes.
Best regards, Vladimir Yudovin,
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?
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Hi Josh,
Running with increased heap size would reduce GC frequency, at the cost of
page cache.
Actually it's recommended to run C* without virtual memory enabled. So if there
is no enough memory JVM fails instead of blocking
Best regards, Vladimir Yudovin,
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Hi,
did this high memory usage caused the problems? OOM crashes, GC pauses?
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On Wed, 26 Oct 2016 21:51:26 -0400Daniel Kleviansky
dan...@kleviansky.com wrote
Before anyone
Yes, as doc says "Expired data is marked with a tombstone" but you save
communication with host and processing of DELETE operator.
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On Tue, 08 Nov 2016 09:32:16 -0500
entry:
UPDATE recent SET review = review - [(1234,12345)] WHERE user_name='some user'
AND video_id='great video';
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On Mon, 07 Nov 2016 21:54:08 -0500ben ben diamond@outlook.com
(user_name text PRIMARY KEY, play_list
LISTfrozenplay);
You can easily retrieve play list for specific user by his ID. Instead of LIST
you can use MAP, I don't think that for ten entries it matters.
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ire creating 1 table per
type of mapint, counter that i need?
But you don't need to create separate table per each counter, just use one row
per counter:
CREATE TABLE cnt (id int PRIMARY KEY , value counter);
Best regards, Vladimir Yudovin,
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s it will be changed, if not - created set to
initial value.
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On Wed, 09 Nov 2016 07:52:29 -0500Ali Akhtar ali.rac...@gmail.com
wrote
The only issue with the last 2 soluti
Hi,
you can change log level with nodetool setlogginglevel command
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On Wed, 09 Nov 2016 10:17:37 -0500Benjamin Roth
benjamin.r...@jaumo.com wrote
Hi!
Is there a way
The deletes will be done at a scheduled time, probably at the end of the
day, each day.
Probably you can use TTL?
http://docs.datastax.com/en/cql/3.1/cql/cql_using/use_expire_c.html
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own table for each device can be
quite heavy solution.
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On Sun, 06 Nov 2016 19:23:20 -0500sat sathish.al...@gmail.com
wrote
Hi,
We are new to Cassandra. For our POC, we
Hi,
can you elaborate a little your data model?
Would you like to create 100 rows for each product and then remove one row and
add this row to customer?
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On Mon, 07 Nov 2016 14:51
For memory usage you can use small command line tool
https://github.com/patric-r/jvmtop
Also there are number of GUI tools that connect to JMX port, like jvisualvm
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On Mon, 07 Nov
) are caused by memory flushes?
Shalom Sagges
DBA
T: +972-74-700-4035
We Create Meaningful Connections
On Thu, Nov 10, 2016 at 11:02 AM, Vladimir Yudovin vla...@winguzone.com
wrote:
This message may contain confidential and/or privileged information
Hi Shalom,
so not sure, but probably excessive memory consumption by this SELECT causes C*
to flush tables to free memory.
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On Thu, 10 Nov 2016 03:36:59 -0500Shalom Sagges
shal
Do you mean the oldest one should be removed when a new play is added?
Sure. As you described the issue "the last ten items may be adequate for the
business"
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On Wed, 09 N
com/dev/blog/dynamic-snitching-in-cassandra-past-present-and-future
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On Wed, 19 Oct 2016 06:14:27 -0400Kant Kodali k...@peernova.com
wrote
can Cassandra cluster direct or load bal
Hi,
what does it exactly mean 'empty timeuuid'? UUID takes 16 bytes for storage,
so it should be either null, or some value. Do you mean 'zero' UUID?
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On Wed, 19 Oct 2016 09:16:29
(or opposite,
heading.speed) and save column storage overhead.
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On Thu, 20 Oct 2016 03:29:16 -0400wxn...@zjqunshuo.com wrote
Hi All,
I'm trying to migrate my time series data
Did you try the same quires with Java driver without using prepared statements?
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On Fri, 14 Oct 2016 15:13:38 -0400Aoi Kadoya cadyan@gmail.com
wrote
pulled from under our
feet without warning.
Yes, in case of planned event. But in case of some hardware failure it can
happen. And it shouldn't be some catastrophe affecting the whole availability
zone. Just failure of singe blade.
Best regards, Vladimir Yudovin,
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Probably used Python driver can't restart failed operation with connection to
other node. Do you provide all three IPs to Python driver for connecting?
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On Mon, 24 Oct 2016 07:48:05
, adding an element
at a particular position results in greater latency than appending or prefixing
an element to a list.
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On Sat, 12 Nov 2016 07:57:36 -0500Ali Akhtar ali.rac...@gmail.com
Hi Boying,
UPDATE write new value with new time stamp. Old value is not tombstone, but
remains until compaction. gc_grace_period is not related to this.
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On Mon, 14 Nov 2016 03:02
Hi Shalom,
there are a lot of discussion on this topic, but it seems that for know we can
call 3.0.xx line as most stable. If you don't need specific feature from 3.x
line take 3.0.10.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Wed, 23 Nov 2016 03
I have 1Cr records in my Java ArrayList and yes I am writing in sync mode.
Is your Java program single threaded?
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On Wed, 23 Nov 2016 03:09:29 -0500Abhishek Kumar Maheshwari
abhishek.maheshw
Hi Ahmed,
obviously, 20-30 sec. pause is unacceptable.
I suppose check the following:
- disable swapping completely
- check Java version, v8. is desirable (depending on Cassandra version)
- use multiprocessor machine (it allows concurrent GC)
Best regards, Vladimir Yudovin,
Winguzone
connection pool (with
TokenAwarePolicy each) and then pass each item to separate thread.
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On Wed, 23 Nov 2016 04:23:13 -0500Abhishek Kumar Maheshwari
abhishek.maheshw...@timesinternet.in wrote
Hi Siddharth
session.execute is coming from Session session = cluster.connect(); I guess?
So actually all threads work with the same TCP connection. It's worth to try
async API with Connection Pool.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Wed, 23 Nov 2016 04
So do you see speed write saturation at this number of thread? Does doubling to
200 bring increase?
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting, Zero production time
On Wed, 23 Nov 2016 03:31:32 -0500Abhishek Kumar Maheshwari
abhishek.maheshw
Try to build cluster with .withPoolingOptions
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On Wed, 23 Nov 2016 05:57:58 -0500Abhishek Kumar Maheshwari
abhishek.maheshw...@timesinternet.in wrote
Yes, i also try with async mode but I got max speed
;
INSERT INTO ks.tb (id) VALUES ( 0);
SELECT * FROM ks.tb ;
id | str
+--
0 | null
(1 rows)
Best regards, Vladimir Yudovin,
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On Wed, 23 Nov 2016 11:59:51 -0500Andrew Cooper
andrew.coo...@nisc.coop wrote
What would
if I use the same certificate how does it helps?
This certificate will be recognized by all existing nodes, and no restart will
be needed.
Or, as Nate suggested, you can use trusted root certificate to issue nodes'
certificates.
Best regards, Vladimir Yudovin,
Winguzone - Hosted Cloud
this situation, may be with some sort of
file locking.
multinode Cassandra for Node B is not free
Sure, but besides higher reliability you also get increase in read queries
speed (with consistency ONE).
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting, Zero production time
Is Apache Cassandra community can update this documentation ?
I don't think so, it's hosted on DataStax website and it's not public Wiki.
Anyway you know what is right quorum calculation formula is ))).
Best regards, Vladimir Yudovin,
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.
Is there any guidance on single instance failover?
I never saw one, the main Casandra idea that you build multinode cluster.
Any specific reason why can't you use two nodes as single cluster?
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting, zero production time
Hi,
Is DROP whole keyspace an option?
Best regards, Vladimir Yudovin,
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On Thu, 24 Nov 2016 03:00:40 -0500joseph gao
gaojf.bok...@gmail.com wrote
Hi, all
I've had a very bad system design before. This caused about 1 tables
You can use cassandra stress-tool.
It has options to set different load patterns.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Thu, 24 Nov 2016 13:27:59 -0500Vikas Jaiman
er.vikasjai...@gmail.com wrote
Hi all,
I want to generate two different
rpc_address: 0.0.0.0 , broadcast_address: 1.2.3.4
Did you try set rpc_address to node IP and not to 0.0.0.0 ?
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Winguzone - Cloud Cassandra Hosting
On Thu, 24 Nov 2016 04:50:08 -0500Jeff Jirsa
jeff.ji...@crowdstrike.com wrote
Did you
Actually you shouldn't drop tables prior to dropping keyspace. Just drop
keyspace with all its tables.
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On Thu, 24 Nov 2016 05:38:36 -0500joseph gao
gaojf.bok...@gmail.com wrote
Hi，Vladimir,
I have
Hi Jai,
so do you generate separate certificate for each node? Why not use one
certificate for all nodes?
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On Mon, 21 Nov 2016 17:25:11 -0500Jai Bheemsen Rao Dhanwada
jaibheem
release, see https://issues.apache.org/jira/browse/CASSANDRA-9472 for
details
on Cassandra start.
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On Thu, 17 Nov 2016 06:02:15 -0500Oleksandr Shulgin
oleksandr.shul...@zalando.de
My question was about a different option named "offheap_objects".
Sorry.
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On Thu, 17 Nov 2016 07:56:10 -0500Oleksandr Shulgin
oleksandr.shul...@zalando.de wrote
O
Try to set broadcast_rpc_address on each node to its real external IP address.
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On Mon, 21 Nov 2016 05:47:00 -0500techpyaasa .
techpya...@gmail.com wrote
Following exception
Did you try any value in the range 8-20 (e.g. 60-70% of physical memory).
Also how many tables do you have across all keyspaces? Each table can consume
minimum 1M of Java heap.
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Not broadcast_address, but broadcast_rpc_address (you gave this
example:rpc_address: 0.0.0.0 , broadcast_rpc_address: 1.2.3.4)
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On Mon, 21 Nov 2016 08:14:38 -0500techpyaasa
to listen for clients on
rpc_port: 9160
So probably rpc_address: 0.0.0.0 is a problem. Also do you have native port
9042 open in firewall (if there is one).
Can you connect to cluster with cqlsh?
Best regards, Vladimir Yudovin,
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Hi,
as I mentioned about rpc_address: 0.0.0.0 YAML says
it is allowed to specify 0.0.0.0 ... but that will break clients that rely on
node auto-discovery.
Try set rpc_address: external_ip
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Hi,
Centos 7 has Java 8 available, so there shouldn't be any problem to run
Casandra.
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On Sun, 20 Nov 2016 11:14:07 -0500Shalom Sagges
shal...@liveperson.com wrote
Hi Guys
with data, then
added third. When did you change replication factor for existing keyspace? Or
it was created with factor three?
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On Mon, 21 Nov 2016 01:28:54 -0500Shalom Sagges
shal...@live
try SELECT for some undoubtedly old data with consistency ALL
It's worth to turn trace on for this query.
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On Mon, 21 Nov 2016 02:05:35 -0500Vladimir Yudovin
vla...@winguzone.com
, Vladimir Yudovin,
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On Sat, 12 Nov 2016 05:34:24 -0500Ali Akhtar ali.rac...@gmail.com
wrote
I have a table where each record contains a liststring of labels.
I have an endpoint which responds to new labels
= '2013-01-01 00:00:00+0200' WHERE id = '1' IF
last_due_at '2013-01-01 00:00:00+0200'
Sure, it's less effective then OR condition. Probably you can use IF NOT EXISTS
in first request (depending on your application logic), may be it will be
slightly faster (not sure).
Best regards, Vladimir
Hi,
probably you can try to start new node with auto_bootstrap: false and then
repair keypaces or even tables one by one with nodetool repair
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On Wed, 02 Nov 2016 10:35:45
Hi,
size of a particular partition key
Can you please elucidate this? Key can be just number, or string, or several
values.
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On Thu, 27 Oct 2016 11:45:47 -0400Pranay akula
either add nodes certificate to their truststore or
disable validation (each Cassandra driver does this in its own way).
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On Thu, 27 Oct 2016 16:45:48 -0400Jacob Shadix
jacobsha...@gmail.com
Both nodes can be seeds.
Probably I misunderstood Raimund as setting each node as the only seed. If he
set both IP on both nodes it's OK.
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On Sun, 30 Oct 2016 14:48:00 -0400Jonathan
, Vladimir Yudovin,
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On Sun, 30 Oct 2016 15:37:50 -0400Raimund Klein
chessra...@gmail.com wrote
Hi guys,
Thank you for your responses. Let me try to address them:
I just tried cqlsh directly with the IP, no change
sh refuses to connect
Can you please give output of
nodetool status
and
netstat -lptn | grep java
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On Sun, 30 Oct 2016 14:11:55 -0400Raimund Klein
chessra...@gmail.com wrote
H
locations) with relative low
latency 1-1.5 ms. or purchase another VLAN in different pod for $25 per month
in the same DC.
We provide Cassandra cluster on all provider in many worldwide locations.
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Hi,
it's not only performance issue. In case of network problem writer tread can be
blocked, also in case of failure loss of data can occur.
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On Tue, 01 Nov 2016 14:10:10 -0400John
her-suites"
You see ssl and keystore options.
The same in 2.0.17, the only SSL option is:
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=false"
Though this config file fo version 2.0 doesn't contain keystore options I think
it's worth to try to add them in v2.0. en
because it says 0 replicas available
Probably you can also use SimpleStrategy (depending on system configuration and
needs)
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On Mon, 10 Oct 2016 16:30:49 -0400Ali
/1476165047920
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On Mon, 10 Oct 2016 17:00:03 -0400Nicolas Douillet
nicolas.douil...@gmail.com wrote
Hi Json,
I'm not familiar enough with Cassandra 3
approach - each node keeps more or less
the same amount of date. If you add new node to cluster it should get the same
data volume that is stored on any other node.
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On Wed, 12 Oct 2016 23:54:58 -0400sudheer k
sudheer.hdp...@gmail.com wrote
Hi All,
I faced issue with triggers today. Below is the clear description of the issue:
1
by 'b'
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On Wed, 12 Oct 2016 23:58:23 -0400Aoi Kadoya cadyan@gmail.com
wrote
yes, that's what I thought. but, when I use these forms,
INSERT
Yes, pass this argument to bin/cassandra script:
bin/cassandra -Djava.io.tmpdir=/path/to/tmpdir
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On Thu, 13 Oct 2016 00:36:35 -0400sudheer k
sudheer.hdp
list.
>From here https://docs.datastax.com/en/cql/3.0/cql/cql_using/use_list_t.html :
These update operations are implemented internally without any
read-before-write. Appending and prepending a new element to the list writes
only the new element.
Best regards, Vladimir Yudo
Yes, Cassandra should keep percent of disk usage equal for all disk. Compaction
process and SSTable flushes will use new disk to distribute both new and
existing data.
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Hi,
you can take a look on
http://docs.datastax.com/en/landing_page/doc/landing_page/recommendedSettingsLinux.html
Regarding file system type I guess ext4 is good enough. (Though RedHat now use
XFS as default FS).
Best regards, Vladimir Yudovin,
Winguzone - Hosted Cloud Cassandra
It's extremely unreliable to use ephemeral (local) disks. Even if you don't
stop instance by yourself, it can be restarted on different server in case of
some hardware failure or AWS initiated update. So all node data will be lost.
Best regards, Vladimir Yudovin,
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But after such restart node should be joined to cluster again and restore data,
right?
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On Mon, 17 Oct 2016 14:55:49 -0400Jonathan Haddad
j...@jonhaddad.com
of
data.
Never insert more than 64K items in a collection.
If you insert more than 64K items into a collection, only 64K of them will be
queryable, resulting in data loss.
Best regards, Vladimir Yudovin,
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On Thu, 01 Dec 2016 12:17:23 -0500
You should also consider end of support term, as Cassandra page says:
Apache Cassandra 2.2 is supported until November 2016.
Apache Cassandra 2.1 is supported until November 2016 with critical fixes only
So 2.1 actually don't get any fixes, even critical.
Best regards, Vladimir Yudovin
. Make test on one-two
node cluster.
Question: What is the effect of below exception?
Is keyspaces created despite exception or no?
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On Mon, 19 Dec 2016 10:24:20 -0500 Saumitra S
saumitra.srivast...@gmail.com
Regarding schema agreement - try to increase time between CF creation.
Also stress-tool waits for schema, look on its code, probably it uses some
methods to ensure schema distribution.
Best regards, Vladimir Yudovin,
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On Mon, 19 Dec 2016 14:35
What is replication factor? Why not use CONSISTENCY QUORUM? It's faster and
safe enough.
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Winguzone - Cloud Cassandra Hosting
On Thu, 22 Dec 2016 10:14:14 -0500 Ali Akhtar ali.rac...@gmail.com
wrote
Is it possible to provide these options
me to the this 1MB per CF thingy, it would be great.
Look at http://www.mail-archive.com/user@cassandra.apache.org/msg46359.html,
CASSANDRA-5935, CASSANDRA-2252
In source look at SlabAllocator.REGION_SIZE definition.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
Hi Shalom,
I don't see any reason why it wouldn't work, but obviously, any resource
sharing affects performance. You can expect less degradation with SSD disks, I
guess.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Wed, 21 Dec 2016 13:31:22 -0500
As error message said "Altering of types is not allowed" is not allowed in
Cassandra. It's NO Sql, but still not schemaless database.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Wed, 22 Mar 2017 18:57:18 -0400 Ryan Flynn ry...@splunk.
Hi,
why not used SELECT JSON * FROM as described here
https://www.datastax.com/dev/blog/whats-new-in-cassandra-2-2-json-support ?
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Thu, 23 Mar 2017 13:08:30 -0400 S G sg.online.em...@gmail.com
wrote
Just wish that an error like: "Table x not found in keyspace y"
You are welcome to open JIRA with type Improvement.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Sun, 26 Mar 2017 13:31:33 -0400 S G sg.online.em...@gmail.com
wrote
T
Hi,
Why did the host ID change?
probably this node data folder (at least system keyspace) was erased. Or nodes
changed their IP, do you use dynamic IPs?
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Mon, 06 Mar 2017 22:44:50 -0500 Joe Olson
technol
Hi,
there is no such hard limit, but each table consume at least 1M memory, so 1000
tables takes at least 1G.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Sun, 05 Mar 2017 05:57:48 -0500 Lata Kannan
lata.kan...@oracle.com wrote
Hi
I just
>From source code and measurement.
Try to create a lot of tables with small write to each of them and monitor Java
heap. Each table takes some more then 1M.
Best regards, Vladimir Yudovin,
Winguzone - Cloud Cassandra Hosting
On Sun, 05 Mar 2017 14:40:42 -0500 benjamin roth
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