I already had this kind of trouble while repairing a month ago. I have
problems that I am the only one to have. I guess I have something
wrong either in the configuration of my nodes or in my data that makes
them wrong after a restart/repair.
I am planning to try deploying an EC2 cluster with data
Doe's Cassandra support data versioning?
I'm trying to find it in many places but I'm not quite sure about it.
Regards,
Felipe Mathias Schmidt
(Computer Science UFRGS, RS, Brazil)
> 1) ok, I can schedule snapshots using cron (snapshot's name will be ganarated
> from current date)
> how can I remove snapshots older than a week ?
Delete the directory on disk.
> 2) ok, I can enable increment backups. How can I remove incremental SSTables
> older than 1 week ?
> it's more
Hi Felipe,
There recently was a thread about (
http://www.mail-archive.com/user@cassandra.apache.org/msg22298.html ). The
answer in short: no. However you can build your own data model to support
it.
Cheers!
2012/5/24 Felipe Schmidt
> Doe's Cassandra support data versioning?
>
> I'm trying to
This is partly historical. NTS (as it is now) has not always existed and was
not always the default. In days gone by used to be a fella could run a mighty
fine key-value store using just a Simple Replication Strategy.
A different way to visualise it is a single ring with a Z axis for the DC's.
Ok... it's really strange to me that Cassandra doesn't support data
versioning cause all of other key-value databases support it (at least
those who I know).
I have one remaining question:
-in the case that I have more than 1 SSTable in the disk for the same
column but with different data versions
I'm not sure what those log messages are from. But….
> UnknownException: [host=192.168.2.13(192.168.2.13):9160, latency=11(31),
> attempts=1] SchemaDisagreementException()
Sounds a bit like.
http://wiki.apache.org/cassandra/FAQ#schema_disagreement
Cheers
-
Aaron Morton
Freel
ReadRepair means including all UP replicas in the request, waiting
asynchronously after the read has completed, resolving and repairing
differences. If you read at QUOURM with RR running, ALL (replace) nodes will
perform a read.
At any CL > ONE the responses from CL nodes are reconciled and di
Your experience is when using CL ONE the Dynamic Snitch is moving local reads
off to other nodes and this is causing spikes in read latency ?
Did you notice what was happening on the node for the DS to think it was so
slow ? Was compaction or repair going on ?
Have you played with the badnes
Dropped read messages occur when the node could not process a read task within
rpc_timeout. It generally means the cluster has been overwhelmed at some point:
too many requests, to much GC, compaction hurting, etc.
Check the server side logs for errors but I doubt it is related to the call
st
> Ok... it's really strange to me that Cassandra doesn't support data
> versioning cause all of other key-value databases support it (at least
> those who I know).
You can design it into your data model if you need it.
> I have one remaining question:
> -in the case that I have more than 1 SSTabl
All data is in the page cache. No repairs. Compactions not hitting disk for
read. CPU <50%. ParNew GC <100 ms in average.
After one compaction completes, new sstable is not in page cache, there may be
a disk usage spike before data is cached, so local reads gets slower for a
moment, comparing w
Hi,
We have defined a CF with a composite row key that sounds like (folder id, doc
id).
For our app, one very common pattern is accessing, through one ui action, some
bunch of data with the following row keys: (id, id_1), (id, id_2), (id, id_3)...
So, multiple rows are accessed, but all row key
You should read multiple "batches" specifying last key received from
previous batch as first key for next one.
For large databases I'd recommend you to use statistical approach (if it's
feasible). With random parittioner it works well.
Don't read the whole db. Knowing whole keyspace you can read pa
Can you attach the cassandra logs? How was it restored? Priam chunks and
compresses before uploading it to S3 and when you restore you have to go
thought Priam to restore...
Regards,
On Thu, May 24, 2012 at 3:58 AM, Jose Flexa wrote:
> Hi all,
>
> Having issues with cassandra 1.0.8 on AWS EC
Hey everyone,
We're trying to migrate a cassandra cluster from a bunch of Windows
machines to a bunch of (newer and more powerful) Linux machines.
Our initial plan was to simply bootstrap the Linux servers into the cluster
one by one, and then decommission the old servers one by one. However, whe
Suppose I have a table in CQL3 with a 2 part composite, and I do a select
that specifies just the second part of the key (not the partition key),
will this result in a full table scan, or is the second part of the key
indexed?
Example:
cqlsh:"Keyspace1"> CREATE TABLE test_table (part1 text, part2
Hey, we thought a bit about it and came up with another solution:
We shut down Cassandra on one of the windows servers, copy over the data
directory to one of the Linux servers, delete the LocationInfo files from
the system keyspace, and start it up.
It should read the saved token from the datafi
On Thu, May 24, 2012 at 12:41 PM, Henrik Schröder wrote:
> We're running version 1.0.8. Is this fixed in a later release? Will this be
> fixed in a later release?
No, mixed-OS clusters are unsupported.
> Are there any other ways of doing the migration? What happens if we join the
> new servers w
Hi all
I am running Cassandra 1.0.10 installed from the apache debs on ubuntu
11.10 on a 7 node cluster.
I moved some tokens around my cluster and now have one node compacting a
large Leveled compaction column family. It has done about 5k out of 10k
outstanding compactions today. The other nodes
On Thu, May 24, 2012 at 8:07 PM, Brandon Williams wrote:
> > Are there any other ways of doing the migration? What happens if we join
> the
> > new servers without bootstrapping and run repair? Are there any other
> ugly
> > hacks or workaround we can do? We're not looking to run a mixed cluster,
On Thu, May 24, 2012 at 1:50 PM, Henrik Schröder wrote:
> Ok. It's important for us to not have any downtime, so how about this
> solution:
>
> We startup the Linux cluster independently.
> We configure our application to send all Cassandra writes to both clusters,
> but only read from the Windows
It also seems like a dark deployment of your new cluster is a great method
for testing the Linux-based systems *before* switching your mision critical
traffic over. Monitor them for a while with real traffic and you can have
confidence that they'll function correctly when you perform the switchover
On Thu, May 24, 2012 at 9:28 PM, Brandon Williams wrote:
>
> That sounds fine, with the caveat that you can't run sstableloader
> from a machine running Cassandra before 1.1, so copying the sstables
> manually (assuming both clusters are the same size and have the same
> tokens) might be better.
On Thu, May 24, 2012 at 3:36 PM, Henrik Schröder wrote:
>> That sounds fine, with the caveat that you can't run sstableloader
>> from a machine running Cassandra before 1.1, so copying the sstables
>> manually (assuming both clusters are the same size and have the same
>> tokens) might be better.
On Thu, May 24, 2012 at 12:44 PM, Steve Neely wrote:
> It also seems like a dark deployment of your new cluster is a great method
> for testing the Linux-based systems before switching your mision critical
> traffic over. Monitor them for a while with real traffic and you can have
> confidence tha
Also it does not sound like you have run anti entropy repair. You should do
that when upping rf.
On Monday, May 21, 2012, Radim Kolar wrote:
> Dne 26.3.2012 19:17, aaron morton napsal(a):
>>
>> Can you describe the situations where counter updates are lost or go
backwards ?
>>
>> Do you ever get T
i'm not sure if using framed transport is an option with hector.
what should i be in the logs looking for to find the cause of these
dropped reads?
thanks,
On 5/24/2012 3:04 AM, aaron morton wrote:
Dropped read messages occur when the node could not process a read
task within rpc_timeout. It
Hi, all.
I'm designing data api service(like cassandra.io but not using dedicated
server for each user) on cassandra 1.1 on which users can do DML/DDL
method like cql.
Followings are api which users can use( almost same to cassandra api).
- create/read/delete ColumnFamilies/Rows/Columns
Now
I have the following schema setup in cassandra 1.1 with cql 3:
CREATE TABLE testCol (
my_id varchar,
time_id TimeUUIDType,
my_value int,
PRIMARY KEY (my_id, time_id)
);
and the following data already inserted:
my_id| time_id |
my_valu
This is a known issue, see
https://issues.apache.org/jira/browse/CASSANDRA-4193.
In the meantime, a workaround is to specify all the column names to be
deleted. I.e.,
delete my_value from testCol where my_id='1_71548' and
time_id=2fc39fa0-1dd5-11b2-9b6a-395f35722afe;
should work.
(I had the s
Thanks for the info Roland! I guess I missed that bug report in my google
searching.
Stephen
On Fri, May 25, 2012 at 12:26 AM, Roland Mechler wrote:
> This is a known issue, see
> https://issues.apache.org/jira/browse/CASSANDRA-4193.
>
> In the meantime, a workaround is to specify all the colum
I have a multiDC ring with 6 nodes in each DC.
I have a single node which runs some jobs (including Hadoop Map-Reduce with
PIG) every 15minutes.
Lately there has been high CPU load and memory issues on this node.
What I could see from Ganglia is high CPU load on this server and also number
of
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