I understand that there will be contention regarding which *n* columns are
the current *n* columns but as mentioned previously the goal is to limit
the accumulation of data as in our use-case some row keys can receive
fairly heavy inserts. For people requiring precise set of current columns
that fe
During compaction, both automatic / minor and manual / major.
The performance drop is having a lot of expired columns that have not been
purged by compaction as they must be read and discarded during reads.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thel
Hi everyone and Happy New Year!
I need advice for organizing data flow outside of my 3 node Cassandra 0.8.6
cluster. I am configuring my keyspace to use the NetworkTopologyStrategy. I
have 2 data centers each with a replication factor 1 (i.e. DC1:1; DC2:1)
the configuration of the PropertyFileSnit
From the help for create column family in the CLI…
- name: Name of the new column family. Names may only contain letters,
numbers and underscores.
The CF name is used as part of a file name that includes other information and
the "-" is used as a separator.
Cheers
-
Aaron Mo
@Aaron: Small side question, when do columns with a past TTL get removed?
On a repair, (minor) compaction, or .. ? Does it have a performance drop if
that's happening?
2012/1/2 aaron morton
> Even if you had compaction enforcing a limit on the number of columns in a
> row, there would still be i
Even if you had compaction enforcing a limit on the number of columns in a row,
there would still be issues with concurrent writes at the same time and with
read-repair. i.e. node a says the this is the first n columns but node b says
something else, you only know who is correct at read time.
H
Nice work! It's beautiful can't wait to play with it! :)
On Mon, Jan 2, 2012 at 12:48 PM, Markus Wiesenbacher | Codefreun.de
wrote:
> Hi,
>
>
>
> I wish you all a happy and healthy new year!
>
>
>
> As you may remember, I coded a little GUI for Apache Cassandra. Now I did
> set up a little projec
Hi,
I wish you all a happy and healthy new year!
As you may remember, I coded a little GUI for Apache Cassandra. Now I did
set up a little project homepage where you can download it, including the
sources:
http://www.codefreun.de
http://www.codefreunde.com
Markus ;)
Yes that makes a lot of sense! on using remaining() method I see the
proper expected sizes.
On Mon, Jan 2, 2012 at 5:26 PM, Sylvain Lebresne wrote:
> I am not familiar enough with Hector to tell you if it is doing something
> special here, but note that:
>
> 1) you may have better luck getting
I am not familiar enough with Hector to tell you if it is doing something
special here, but note that:
1) you may have better luck getting that kind of question answered
quickly by using the Hector mailing list.
2) that may or may not change what you're seeing (since again I don't
know what Hecto
On Mon, Jan 2, 2012 at 11:51 AM, Thibaut Britz
wrote:
> Hi,
>
> due to a misconfiguration on our site, some parts of our data got saved with
> a wrong expiration date, which expired just recently.
>
> How can I recover the data?
> Is it sufficient to copy over a backup of the tables into the table
Sorry I forgot to tell that I'm using Hector to communicate with
Cassandra. CS.toByteBuffer is to convert the composite type name to
ByteBuffer.
Can anyone aware of Hector API enlighten me why am I seeing this size for
the composite type names.
On Mon, Jan 2, 2012 at 2:52 PM, aaron morton wrote
Hi,
due to a misconfiguration on our site, some parts of our data got saved
with a wrong expiration date, which expired just recently.
How can I recover the data?
Is it sufficient to copy over a backup of the tables into the table
directory and iterate over the table (e.g. Read.ALL). Does cassand
I would try to nodetool scrub the data on the node that that sent the bad data
in the stream. You may be able to work which node from the logs, or it may be
easier to just scrub them all.
Hope that helps.
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickl
If you use the --debug flag when you start the CLI it always will print full
stack traces.
What is the CF definition ? I'm guessing the column_metadata specifies that
the age column is a Long
Was there existing data in the age column and if so how was it encoded ? Was
the existing data was e
Renaming a CF is not directly supported.
You can:
1) Add the new CF using the CLI or CQL
2) On each node copy the SSTable files and use the new CF name.
3) Drop the old CF using the CLI or CQL
4) The Drop CF command will create a snapshot, you may want to delete this.
Hope that helps.
--
What is the definition of the composite type and what is CS.toByteBuffer ?
CompositeTypes have a small overhead see
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/marshal/CompositeType.java
Hope that helps.
Aaron
-
Aaron Morton
Freelance Develo
> Is there any way to control the CPU load when using the "stress" benchmark?
> I have some control over that with our home-grown benchmark, but I
> thought it made sense to use the official benchmark tool as people might
> more readily believe those results and/or be able to reproduce them. But
>
No
Le 2 janv. 2012 08:44, "ravikumar visweswara" a
écrit :
> Thank You Naren. If key k1>k2 (lexicologicaly), will md5(k1) > md5(k2)?.
>
> - R
>
>
> On Sun, Jan 1, 2012 at 7:07 PM, Narendra Sharma > wrote:
>
>> A token is a MD5 hash (one way hash). You cannot compute the key given a
>> token. You
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