best regards,
Zhu Han
On Sun, Apr 3, 2011 at 9:21 AM, Anurag Gujral wrote:
> Hi All,
>I have loaded data into cassandra using batch processing the
> response times for reads are in the range of 0.8 ms but I am using SSDs. so
> I expect the read times to be even faster.
>
Does you
Is this still a problem ? Are you getting errors on the server ?
It should be choosing the directory with the most space.
btw, the recommended approach is to use a single large volume/directory for the
data.
Aaron
On 2 Apr 2011, at 01:56, Anurag Gujral wrote:
> Hi All,
> I have s
With only one data file your reads would use the least amount of IO to find the
data.
Most people have multiple nodes and probably fewer disks, so each node may have
a TB or two of data. How much capacity do your 10 disks give ? Will you be
running multiple nodes in production ?
Aaron
On
On 3/30/2011 1:11 AM, Gregori Schmidt wrote
>
> * You need to have official client libraries and they need to be
> programmer friendly. Yes, I know there are nice people
> maintaining a plethora of different libraries, but you need to
> man up and face reality: the chaos tha
Now it is using all the three disks . I want to understand why recommended
approach is to use
one single large volume /directory and not multiple ones,can you please
explain in detail.
I am using SSDs using three small ones is cheaper than using one large one.
Please Suggest
Thanks
Anurag
On Sun,
I think if i can keep a single sstable file in a proper size, the hot
data/index files may be able to fit into memory at least in some occasions.
In my use case, I want to use cassandra for storage of a large amount of log
data.
There will be multiple nodes, and each node has 10*2TB disks to hold
> My Xmx and Xms are both 7.5GB. However, I never see the heap usage
> reach past 5.5. Think it is still a good idea to increase the heap?
Not necessarily. I thought you had a max heap of 5.5, in which case a
live set of 4 gb after a completed cms pass seemed pretty high. Seems
more reasonable if
On Sun, Apr 3, 2011 at 1:46 PM, Sheng Chen wrote:
> I think if i can keep a single sstable file in a proper size, the hot
> data/index files may be able to fit into memory at least in some occasions.
>
> In my use case, I want to use cassandra for storage of a large amount of log
> data.
> There w
How did you solve it?
On Sun, Apr 3, 2011 at 7:32 PM, Anurag Gujral wrote:
> Now it is using all the three disks . I want to understand why recommended
> approach is to use
> one single large volume /directory and not multiple ones,can you please
> explain in detail.
> I am using SSDs using thre
Hi All,
How can I change the row cache size in cassandra. I could not find
any documentation on this.
Thanks
Anurag
Hi Everyone,
I posted the following email a couple of days ago and I didn't get any
responses. Makes me wonder, does anyone on this list know/use Secondary
Indexes? They seem to me like a pretty big feature and it's a bit disappointing
to not be able to get a documentation on it.
The only thin
Hi,
I'm doing a stress test, and cassandra crashed with this Exception:
ERROR [MutationStage:9] 2011-04-03 21:11:50,152
DebuggableThreadPoolExecutor.java (line 103) Error in ThreadPoolExecutor
java.lang.NullPointerException
at
org.apache.cassandra.io.sstable.IndexSummary$KeyPosition.compa
Hi Zhu,
I did not got that SSDs have read latency of 0.1ms.Since there
is only one data file
I would expect the read of any key to take 0.1ms may be I am missing
something
please explain.
Thanks
Anurag
On Sun, Apr 3, 2011 at 5:01 AM, Zhu Han wrote:
>
> best regards,
> Zhu Han
>
>
>
Hi All,
I looked at the nodetool there is an option to change cache
sizes .
Thanks
Anurag
On Sun, Apr 3, 2011 at 12:25 PM, Anurag Gujral wrote:
> Hi All,
> How can I change the row cache size in cassandra. I could not find
> any documentation on this.
> Thanks
> Anurag
>
I'm not familiar with some of the details, but I'll try to answer your
questions in general. Secondary indexes are implemented as a slightly
special separate column family with the indexed value serving as the key;
most of the properties of secondary indexes follow from that.
On Sun, Apr 3, 2011
Thanks Tyler. Can you update the wiki with these answers so they are stored
there for others to see too?
On Apr 3, 2011, at 12:51 PM, Tyler Hobbs wrote:
> I'm not familiar with some of the details, but I'll try to answer your
> questions in general. Secondary indexes are implemented as a slig
On Apr 3, 2011, at 2:22 PM, Drew Kutcharian wrote:
> Thanks Tyler. Can you update the wiki with these answers so they are stored
> there for others to see too?
Dude, it's a wiki.
Yea I know, I just didn't know anyone can update it.
On Apr 3, 2011, at 1:26 PM, Joe Stump wrote:
>
> On Apr 3, 2011, at 2:22 PM, Drew Kutcharian wrote:
>
>> Thanks Tyler. Can you update the wiki with these answers so they are stored
>> there for others to see too?
>
> Dude, it's a wiki.
I just updated added a new page to the wiki:
http://wiki.apache.org/cassandra/SecondaryIndexes
On Apr 3, 2011, at 7:37 PM, Drew Kutcharian wrote:
> Yea I know, I just didn't know anyone can update it.
>
>
> On Apr 3, 2011, at 1:26 PM, Joe Stump wrote:
>
>>
>> On Apr 3, 2011, at 2:22 PM, Dre
Not sure, but I've been playing with running cassandra in the same VM as an
HTTP server for a pet project of mine, using a similar technique as the one
found in the Solandra project. It does use ports on localhost,
but hopefully gives you an idea of embedding cassandra (no clue if its a
good idea
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