Hi Tyler,
You're right, the math does assume independence which is unlikely to be
accurate. But if you do have correlated failure modes e.g. same power,
racks, DC, etc. then you can still use Cassandra's rack-aware or DC-aware
features to ensure replicas are spread around so your cluster can
On Mon, Dec 10, 2012 at 12:36 PM, Abhijit Chanda
abhijit.chan...@gmail.comwrote:
Hi All,
I have a column family which structure is
CREATE TABLE practice (
id text,
name text,
addr text,
pin text,
PRIMARY KEY (id, name)
) WITH
comment='' AND
caching='KEYS_ONLY' AND
Assuming you need to work with quorum in a non-vnode scenario. That means
that if 2 nodes in a row in the ring are down some number of quorum
operations will fail with UnavailableException (TimeoutException right
after the failures). This is because the for a given range of tokens quorum
will be
my two cents ... i know this thread is a bit old, but the fact that
odd-sized SSTABLEs (usually large ones) will hang around for a while
can be very troublesome on disk space and planning. our data is
temporal in cassandra, being deleted constantly. we have seen space
usage in the 1+ TB range
On Thu, Dec 6, 2012 at 7:36 PM, aaron morton aa...@thelastpickle.com wrote:
So for memory mapped files, compaction can do a madvise SEQUENTIAL instead
of current DONTNEED flag after detecting appropriate OS versions. Will this
help?
AFAIK Compaction does use memory mapped file access.
The
I know it's probably not a good idea to use multiget, but for my use case, it's
the only choice,
I have question regarding the SlicePredicate argument of the multiget_slice
The SlicePredicate takes slice_range which takes start, end and range. I
suppose start and end will apply to each
What's wrong with multiget…parallel performance is great from multiple disks
and so usually that is a good thing.
Also, something looks wrong, since you have listbinary keys, I would expect
the Map to be Mapbinary, listColumnOrSuperColumn
Are you sure you have that correct? IF you set range
Well, not sure how parallel is multiget. Someone is saying it's in parallel
sending requests to the different nodes and on each node it's executed
sequentially. I didn't bother looking into the source code yet. Anyone knows it
for sure?
I am using Hector, just copied the thrift definition from
Hello,
I have base Cassandra 1.1.7 installed in two data centers with 3 nodes each
using a PropertyFileSnitch as outlined below. When I run a nodetool ring, I see
a very uneven load. Any idea what I could be going on? I have not added/removed
any nodes or changed the replication scheme or
