Dne 4.4.2012 6:52, Igor napsal(a):
Here is small python script I run once per day. You have to adjust
size and/or age limits in the 'if' operator. Also I use mx4j interface
for jmx calls.
forceUserDefinedCompaction would be more usefull if you could do
compaction on 2 tables. If i run it on sin
I'll try to explain in more details:
Assume I insert all my data with TTL=2weeks and let we have sstable A
which was created week ago at the time T, so I know that right now it
contain:
1) some data that were inserted not later than T and may-be not expired yet
2) some amount of data that wer
Its recommended to disable swap entirely when you run Cassandra on a server.
2012/4/14 ruslan usifov
> I forgot to say that system have 24GB of phis memory
>
>
> 2012/4/14 ruslan usifov
>
>> Hello
>>
>> We have 6 node cluster (cassandra 0.8.10). On one node i increase java
>> heap size to 6GB,
I know:-) but this is not answer:-(. I found that on other nodes there
still about 3GB (on node with JAVA_HEAP=6GB free memory also 3GB) of free
memory but there JAVA_HEAP=5G, so this looks like some sysctl
(/proc/sys/vm???) ratio (about 10%(3 / 24 * 100)), i don't known which,
anybody can explain
Maybe it has got something to do with "swapiness", it's something you can
configure, more info here:
https://www.linux.com/news/software/applications/8208-all-about-linux-swap-space
2012/4/14 ruslan usifov
> I know:-) but this is not answer:-(. I found that on other nodes there
> still about 3G
> but using insert query of cql is not working because i have fields in my
> table which has null values for the columns and cassandra would not take null
> values.
You do not need to insert the null values. How they are handled depends on the
.net client you are using. If you really want to i
From https://help.ubuntu.com/community/SwapFaq
"
swappiness=0 tells the kernel to avoid swapping processes out of physical
memory for as long as possible
"
If you have swap enabled at some point the OS may swap out pages, even if
swappiness is 0 and you have free memory. Disable swap entirely if
Thnx a lot :) :)
On Sat, Apr 14, 2012 at 11:59 PM, aaron morton wrote:
> but using insert query of cql is not working because i have fields in my
> table which has null values for the columns and cassandra would not take
> null values.
>
> You do not need to insert the null values. How they are h
Hi,
I am new to cassandra and using *Hector* for writing code.
I am having trouble with running mapreduce in distributed(pseduo) mode.
My OutputFormat is ColumnFamilyOutputFormat
but it doesn't write the output there and also it runs M-R jobs in local
mode.
I suppose as in Word-count example I hav
