Hi!
I am trying to load sstables generated onto a running multi-node
Cassandra cluster. But I see problems only with multi-cluster and
single node works fine.
Cassandra version used is 1.1.2 .
The cassandra cluster seems to be active.
-bash-3.2$ nodetool -host 129.56.57.45 -p 7199 ring
Address
Got it. Thanks again, Aaron.
-- Y.
On Tue, Dec 4, 2012 at 3:07 PM, aaron morton wrote:
> Does this mean we should not enable row caches until we are absolutely
> sure about what's hot (I think there is a reason why row caches are
> disabled by default) ?
>
> Yes and Yes.
> Row cache takes mem
For background, a discussion on estimating working set
http://www.mail-archive.com/user@cassandra.apache.org/msg25762.html . You can
also just look at the size of tenured heap after a CMS.
Are you seeing lots of ParNew or CMS ?
GC activity is a result of configuration *and* workload. Look in y
I wrote a script to sym link the snapshots together the other day
https://github.com/amorton/cass_snapshot_link
I've not really used it in anger yet. That is to say I wrote it for fun and it
worked on my mac book. If you use it let me know if it works.
Cheers
A
-
Aaron Morton
> Does this mean we should not enable row caches until we are absolutely sure
> about what's hot (I think there is a reason why row caches are disabled by
> default) ?
Yes and Yes.
Row cache takes memory and CPU, unless you know you are getting a benefit from
it leave it off. The key cache and
> Node B stil not get any update/data from Node A. Do we need to execute any
> command to sync both nodes?
Are you seeing the MutationStage completed tasks count change in nodetool
tpstats ?
> # /opt/apache-cassandra-1.1.4/bin/nodetool -h localhost ring
> Address DC Rack
> Will MMapping data files be detrimental for reads, in this case?
No.
> In general, when should we opt for MMap data files and what are the factors
> that need special attention when enabling the same?
mmapping is the default, so I would say use it until you have a reason not to.
mmapping wil
> We do not want to manually set the value for initial_token for each node
> (kind of defeats the goal of being dynamic..)
You *really* do want to do this.
Adding without setting a token will result in an unbalanced cluster.
The 1.1 distro includes a token generator in tools/bin/token-generator
The Cassandra team is pleased to announce the release of the third beta for
the future Apache Cassandra 1.2.0.
Let me first stress that this is beta software and as such is *not* ready
for
production use.
This release is still beta and as such may contain bugs. Any help testing
this beta would be
Hello,
Our Cassandra cluster has, relatively recently, started experiencing
memory pressure that I am in the midsts of diagnosing. Our system has
uneven levels of traffic, relatively light during the day, but extremely
heavy during some overnight processing. We have started getting a message
Thanks for all the responses!
On 12/3/2012 6:55 PM, Bill de hÓra wrote:
A Cassandra JVM will generally not function well with with caches and
wide rows. Probably the most important thing to understand is Ed's
point, that the row cache caches the entire row, not just the slice
that was read out
Hi
I think he was talking about the "fragmentation" of the snapshot. In
cassandra 1.0.X all ColumnFamilies are in the same directory, but in
cassandra 1.1.X each ColumnFamily is in its own directory, and snapshots of
each ColumnFamily are inside this directory.
1.0.X Snapshot directory:
/cassandr
Yup, got it. Thanks Aaron.
On Tue, Dec 4, 2012 at 4:47 AM, aaron morton wrote:
> I responded on your other thread.
>
> Cheers
>
>-
> Aaron Morton
> Freelance Cassandra Developer
> New Zealand
>
> @aaronmorton
> http://www.thelastpickle.com
>
> On 4/12/2012, at 5:31 PM, Yimin
Hi Aaron,
Thank you,and your explanation makes sense. At the time, I thought having
1GB of row cache on each node was plenty enough, because there was an
aggregated 6GB cache, but you are right, with each row in 10's of MBs, some
of the nodes can go into a constant load and evict cycle and would
Hi,
I have setup 2 nodes cluster with Replica factor 2. I have restored
snapshot of another cluster on Node A and restarted cassandra process.
Node B stil not get any update/data from Node A. Do we need to execute
any command to sync both nodes?
# /opt/apache-cassandra-1.1.4/bin/nodetool -h
I responded on your other thread.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 4/12/2012, at 5:31 PM, Yiming Sun wrote:
> I ran into a different problem with Row cache recently, sent a message to the
> list, but
> Row Cache: size 1072651974 (bytes), capacity 1073741824 (bytes), 0
> hits, 2576 requests, NaN recent hit rate, 0 save period in seconds
So the cache is pretty much full, there is only 1 MB free.
There were 2,576 read requests that tried to get a row from the cache. Zero of
those had
In our main application we are using local quorum to read. I realise
the default for cli is one, the point is that we want all our data on
all the servers, hence specifying [dc1:3, dc2:3] as the replication
strategy. After a couple of days we would expect it to have
replicated.
As I said, we will
> A few days after writing the data, we tried this on cassandra-cli
The default consistency level in the CLI is ONE, did you change it to LOCAL
QUOURM ?
(I'm assuming your example is for two reads from the same CF)
It looks like the first read was done at a lower CL, and the value returned is
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