We use the Java Service Wrapper from Tanuki Software and are very happy
with it. It's a lot more robust than jsvc.
http://wrapper.tanukisoftware.com/doc/english/download.jsp
The free community version will be enough in most cases.
Jon
On May 11, 2011 10:30pm, Anton Belyaev wrote:
Hello,
On each of our nodes we have an average of 80 - 100 GB actual cassandra data on
1 TB disks.There is normally plenty of capacity on the nodes. Swap is OFF.
OS is Debian 64 bit.
Every once in a while, the disk usage will skyrocket to 500+ GB, even once
filling up the 1 TB disk (at least
I recently removed a node (with decommission) from our cluster.
I added a couple new nodes and am now trying to rebalance the cluster using
nodetool move.
However, netstats shows that the node being "moved" is trying to stream data
to the node that I already decommissioned yesterday.
The remo
I'm not sure if this is the absolute best advice, but perhaps
running "clean" on the data will help cleanup any data that isn't assigned
to this token - in case you've moved the cluster around before.
Any exceptions in the logs, eg EOF ? I experienced this and it caused the
repairs to trip
printed out.
Can you check from the other nodes in the cluster to see if they are
receiving the stream ?
cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 26 May 2011, at 00:42, Jonathan Colby wrote
>
>>>
>>> cheers
>>>
>>>
>>>
>>> -
>>>
>>> Aaron Morton
>>>
>>> Freelance Cassandra Developer
>>>
>>> @aaronmorton
>>>
>>> http://www.thelastpickle.com
>>&
X
number of gossip rounds and then disappears.
Hope that helps.
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 26 May 2011, at 19:58, Jonathan Colby wrote:
> @Aaron -
>
> Unfortunately I'm st
A node with IP 10.46.108.102 was removed from the cluster several days ago
but the cassandra logs are full of these messages!
Anyone know how to permanently remove this information? I\m beginning to
think it is affecting the throughput of the live ndes.
INFO [FlushWriter:1] 2011-05-27 04:28
Hi -
Operations like repair and bootstrap on nodes in our cluster (average
load 150GB each) take a very long time.
By long I mean 1-2 days. With nodetool "netstats" I can see the
progress % very slowly progressing.
I guess there are some throttling mechanisms built into cassandra.
And yes the
Thanks Ed! I was thinking about surrendering more memory to mmap
operations. I'm going to try bringing the Xmx down to 4G
On Fri, May 27, 2011 at 5:19 PM, Edward Capriolo wrote:
>
>
> On Fri, May 27, 2011 at 9:08 AM, Jonathan Colby
> wrote:
>>
>> Hi -
>
possible to add a new
>> application state that purges an IP from the ring. e.g.
>> VersionedValue.STATUS_PURGED that works with a ttl so it goes through X
>> number of gossip rounds and then disappears.
>>
>>
>>
>> Hope that helps.
>>
>&g
OK, is seems a "phantom" node (one that was removed from the cluster)
kept being passed around in gossip as a down endpoint and was messing
up the gossip algorithm. I had the luxury of being able to stop the
entire cluster and bring the nodes up one by one. That purged the bad
node from gossip.
It might just not have occurred to me in the previous 0.7.4 version,
but when I do a repair on a node in v0.7.6, it seems like data is also
synced with neighboring nodes.
My understanding of repair is that the data is reconciled one the node
being repaired. i.e., data is removed or added to that n
I'm trying to run a repair on a 7.6-2 Node. After running the repair command,
this line shows up in the cassandra.log, but nothing else. It's been hours.
Nothing is seen in the logs from other servers or with nodetool commands like
netstats or tpstats.
How do I know if the repair is actu
When I run repair on a node in my 0.7.6-2 cluster, the repair starts to stream
data and activity is seen in the logs.
However, after a while (a day or so) it seems like everything freezes up. The
repair command is still running (the command prompt has not returned) and
netstats shows output s
I got myself into a situation where one node (10.47.108.100) has a lot more
data than the other nodes. In fact, the 1 TB disk on this node is almost
full. I added 3 new nodes and let cassandra automatically calculate new tokens
by taking the highest loaded nodes. Unfortunately there is still
owned range, so it's good practice to
> immediately run repair on a node that you do a removetoken / re-join on.
>
> The rest of your balancing should be an iteration on the above steps moving
> through the range.
>
>
> On 6/9/11 6:21 AM, Jonathan Colby wrote:
>
I've been reading inconsistent descriptions of what major and minor compactions
do. So my question for clarification:
Are tombstones purges (ie, space reclaimed) for minor AND major compactions?
Thanks.
I'm seeing this in my logs. We are storing emails in cassandra and some of
them might be rather large.
Is this bad? What exactly is happening when this appears?
INFO [CompactionExecutor:1] 2011-06-11 13:39:19,217 CompactionIterator.java
(line 150) Compacting large row
39653235326331302d626
e the difference between cleanup and
compactions?
On Sat, Jun 11, 2011 at 8:14 AM, Jonathan Ellis jbel...@gmail.com> wrote:
Yes.
On Sat, Jun 11, 2011 at 6:08 AM, Jonathan Colby
jonathan.co...@gmail.com> wrote:
> I've been reading inconsistent descriptions of w
jsvc is not very flexible. Check out wrapper software out. we swear by it.
http://wrapper.tanukisoftware.com/doc/english/download.jsp
On Jun 17, 2011, at 2:52 AM, Ken Brumer wrote:
>
> Anton Belyaev gmail.com> writes:
>
>>
>> I guess it is not trivial to modify the package to make it use J
I just took a look at the demo. This is really great stuff! I will try this
on our cluster as soon as possible. I like this because it allows people not
too familiar with the cassandra CLI or Thrift a way to query cassandra data.
On Jun 20, 2011, at 10:56 AM, Markus Wiesenbacher | Codefr
The way compaction works, "x" same-sized files are merged into a new SSTable.
This repeats itself and the SSTable get bigger and bigger.
So what is the upper limit?? If you are not deleting stuff fast enough,
wouldn't the SSTable sizes grow indefinitely?
I ask because we have some rather
day
we're going to hit a dead end.
On Jun 22, 2011, at 6:50 PM, Eric tamme wrote:
> On Wed, Jun 22, 2011 at 12:35 PM, Jonathan Colby
> wrote:
>>
>> The way compaction works, "x" same-sized files are merged into a new
>> SSTable. This repeats itself a
eally large SSTables is the best way to do. Scale
> out and avoid very large SSTables/node if possible.
>
> Edward
>
>
> On Wed, Jun 22, 2011 at 12:35 PM, Jonathan Colby
> wrote:
>
> The way compaction works, "x" same-sized files are merged into a new
> SS
Thanks Ryan. Done that : ) 1 TB is the striped size.We might look into
bigger disks for our blades.
On Jun 22, 2011, at 7:09 PM, Ryan King wrote:
> On Wed, Jun 22, 2011 at 10:00 AM, Jonathan Colby
> wrote:
>> Thanks for the explanation. I'm still a bit "skepti
Awesome tip on TTL. We can really use this as a catch-all to make sure all
columns are purged based on time. Fits our use-case good. I forgot this
feature existed.
On Jun 22, 2011, at 7:11 PM, Eric tamme wrote:
>>> Second, compacting such large files is an IO killer.What can be tuned
>>
Hi -
I'd like to understand more how the token is hashed with the key to determine
on which node the data is stored - called decorating in cassandra speak.
Can anyone share any documentation on this or describe this more in detail?
Yes, I could look at the code, but I was hoping to be able to
A compaction will be triggered when "min" number of same sized SStable files
are found. So what's actually the purpose of the "max" part of the
threshold?
On Jun 23, 2011, at 12:55 AM, aaron morton wrote:
> Setting them to 2 and 2 means compaction can only ever compact 2 files at
> time
tReplicationStrategy.calculateNaturalEndpoints() implementations.
>>
>> Does that help?
>>
>> -
>> Aaron Morton
>> Freelance Cassandra Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 23 Jun 2011, at 19:58, Jonathan Colby wrote:
I regularly run repair on my cassandra cluster. However, I often seen that
during the repair operation very large amounts of data are transferred to other
nodes.
My questions is, if only some data is out of sync, why are entire Data files
being transferred?
/var/lib/cassandra/data/DFS/ma
s
apply to my situation.
Thanks. Looking forward to the release where these 2 things are fixed.
On , Jonathan Ellis wrote:
On Thu, Jul 21, 2011 at 9:14 AM, Jonathan Colby
jonathan.co...@gmail.com> wrote:
> I regularly run repair on my cassandra cluster. However, I often seen
t
One of the main reasons for regularly running repair is to make sure
deletes are propagated in the cluster, ie, data is not resurrected if a
node never received the delete call.
And repair-on-read takes care of repairing inconsistencies "on-the-fly".
So if I were to set a universal TTL on al
good points Aaron. I realize now how expensive repair on reads are. I'm
going to keep doing repairs regularly but still have a max TTL on all
columns to make sure we don't have really old data we no longer need
getting buried in the cluster.
On , aaron morton wrote:
Read repair will only r
A simple kill without -9 should work. Have you tried that?
On , Jason Pell wrote:
Check out the rpm packages from Cassandra they have init.d scripts that
work very nicely, there are debs as well for ubuntu
Sent from my iPhone
On Jul 27, 2011, at 3:19, Priyanka priya...@gmail.com> wrote:
Hi - sorry if this was asked before but I couldn't find any answers about it.
Is the upgrade path from 0.7.6 to 0.8.4 possible via a simple rolling restart?
Are nodes with these different versions compatible - i.e., can one node be
upgraded in order to see if we run into any problems before
Hi -
From what I understand, Peter's recommendation should work for you. They
have both worked for me. No need to copy anything by hand on the new node.
Bootstrap/repair does that for you. From the Wiki:
If a node goes down entirely, then you have two options:
(Recommended approach) Bring
I ran into this. I also tried log_ring_state=false which also did not help.
The way I got through this was to stop the entire cluster and start the nodes
one-by-one.
I realize this is not a practical solution for everyone, but if you can afford
to stop the cluster for a few minutes, it's
I have a very basic question which I have been unable to find in
online documentation on cassandra.
It seems like every node in a cassandra cluster contains all the data
ever stored in the cluster (i.e., all nodes are identical). I don't
understand how you can scale this on commodity servers with
mall clusters if makes sense
> for R to be close to N in which case cassandra is useful so the database
> doesn't have a single a single point of failure but not so much b/c of the
> size of the data. But for large clusters it rarely makes sense to have N=R,
> usually N >> R.
awesome! Thank you guys for the really quick answers and the links to
the presentations.
On Thu, Dec 9, 2010 at 12:06 PM, Sylvain Lebresne wrote:
>> This helps a little but unfortunately I'm still a bit fuzzy for me. So is it
>> not true that each node contains all the data in the cluster?
>
>
Hi cassandra experts -
We're planning a cassandra cluster across 2 datacenters
(datacenter-aware, random partitioning) with QUORUM consistency.
It seems to me that with 2 datacenters, if one datacenter is lost,
the reads/writes to cassandra will fail in the surviving datacenter
because of the N
Thanks a lot Peter. So basically we would need to choose a
consistency other than QUORUM.I think in our case consistency is
not necessarily an issue since our data is write-once, read-many
(immutable data). I suppose having a replication factor of 4 would
result in two nodes in each datacen
I was unable to find example or documentation on my question. I'd like to know
what the best way to group a cluster of cassandra nodes behind a virtual ip.
For example, can cassandra nodes be placed behind a Citrix Netscaler hardware
load balancer?
I can't imagine it being a problem, but in
It is required, but
> not sufficient.
>
> The real test is the JMX values.
>
> Dave Viner
>
>
> On Mon, Dec 20, 2010 at 6:25 AM, Jonathan Colby
> wrote:
> I was unable to find example or documentation on my question. I'd like to
> know what the best w
Hi -
I have a question. Obviously there is no purpose in running
OldNetworkTopologyStrategy in one data center. However, we want to
share the same configuration in our production (multiple data centers)
and pre-production (one data center) environments.
My question is will
org.apache.cassandra.
According to the Cassandra Wiki and OReilly book supposedly there is a
"contrib" directory within the cassandra download containing the
Python Stress Test script stress.py. It's not in the binary tarball
of 0.7.3.
Anyone know where to find it?
Anyone know of other, maybe better stress testing sc
How can a cassandra node be taken back into the ring after being decommissioned
(with nodetool decommission for example)?
Yes, I am aware that no data is removed and you have to clean the data
directory if you want the node to pick up a different token range.
I just want to know how to put back
Hi -
If a seed crashes (i.e., suddenly unavailable due to HW problem), what is the
best way to replace the seed in the cluster?
I've read that you should not bootstrap a seed. Therefore I came up with this
procedure, but it seems pretty complicated. any better ideas?
1. update the seed l
Of course! why didn't i think of that? Thanks!!
On Mar 17, 2011, at 3:11 PM, Edward Capriolo wrote:
> On Thu, Mar 17, 2011 at 9:09 AM, Jonathan Colby
> wrote:
>> Hi -
>>
>> If a seed crashes (i.e., suddenly unavailable due to HW problem), what is
>> the
This is a two part question ...
1. If you have cassandra nodes with different sized hard disks, how do you
deal with assigning the token ring such that the nodes with larger disks get
more data? In other words, given equally distributed token ranges, when the
smaller disk nodes run out of s
We use Puppet to manage the cassandra.yaml in a different location from the
installation. Ours is in /etc/cassandra/cassandra.yaml
You can set the environment CASSANDRA_CONF (i believe it is. check the
cassandra.in.sh) and the startup script will pick up this as the configuration
file to u
According to the Wiki Page on compaction: once compaction is finished, the old
SSTable files may be deleted*
* http://wiki.apache.org/cassandra/MemtableSSTable
I thought the old SSTables would be deleted automatically, but this wiki page
got me thinking otherwise.
Question is, if it is true
It seems some settings like memtable_throughput_in_mb are Keyspace-specific
(at least with 0.7.4).
How can these settings best be changed on a running cluster?
PS - preferable by a sysadmin using nodetool or cassandra-cli
Thanks!
Jon
ndra will force one itself if it detects that it
> is low on space. A compaction marker is also added to obsolete
> sstables so they can be deleted on startup if the server does not
> perform a GC before being restarted.
>
> On Tue, Mar 22, 2011 at 8:30 AM, Jonathan Colby
> wrote:
Hi -
On our recently live cassandra cluster of 5 nodes, we've noticed that the
latency readings, especially Reads have gone up drastically.
TotalReadLatencyMicros 5413483
TotalWriteLatencyMicros 1811824
I understand these are in microseconds, but what meaning do they have for
Hi -
Our cluster is spread between 2 datacenters. We have a straight-forward IP
assignment so that OldNetworkTopology (rackinferring snitch) works well.We
have cassandra clients written in Hector in each of those data centers. The
Hector clients all have a list of all cassandra nodes ac
?
On Mar 24, 2011, at 2:02 PM, Jonathan Colby wrote:
> Hi -
>
> Our cluster is spread between 2 datacenters. We have a straight-forward IP
> assignment so that OldNetworkTopology (rackinferring snitch) works well.
> We have cassandra clients written in Hector in each of tho
most likely be the best performing.
This policy is still in trunk and 0.7.0 tip. We should have a new
release out containing the above in the next few days.
On Thu, Mar 24, 2011 at 8:46 AM, Jonathan Colby
jonathan.co...@gmail.com> wrote:
> Indeed I found the big flaw in my own
Cacti and Munin are great for graphing, nagios is good for monitoring.
I wrote a very simple JMX proxy that you can send a request to and it retrieves
the desired JMX beans.
there are jmx proxys out there if you don't want to write your own, for example
http://code.google.com/p/polarrose-jmx-re
Does anyone know how cassandra chooses the nodes for its other replicant copies?
The first node gets the first copy because its token is assigned for that key.
But what about the other copies of the data?
Do the replicant nodes stay the same based on the token range? Or are the
other copies
Hi Peter -
Thanks for the response and adding the FAQ. Really great answers.
So if I understand correctly, the nodes getting the replica copies are
predetermined, based on the replication strategy.
One thing is still a bit unclear. So once a node establishes who its
replicants are, are t
I'm a little unclear on the differences between the nodetool operations:
- compaction
- repair
- clean
I understand that compaction consolidates the SSTables and physically performs
deletes by taking into account the Tombstones. But what does clean and repair
do then?
From my understanding of replica copies, cassandra picks which nodes to
replicate the data based on replication strategy, and those same "replica
partner" nodes are always used according to token ring distribution.
If you change the replication strategy, does cassandra pick new nodes to
repl
silly question, would every cassandra installation need to have manual repairs
done on it?
It would seem cassandra's "read repair" and regular compaction would take care
of keeping the data clean.
Am I missing something?
On Mar 30, 2011, at 7:46 PM, Peter Schuller wrote:
>> I just wanted t
Peter -
Thanks a lot for elaborating on repairs.Still, it's a bit fuzzy to me why
it is so important to run a repair before the GCGraceSeconds kicks in. Does
this mean a delete does not get "replicated" ? In other words when I delete
something on a node, doesn't cassandra set tombstones
t
> strategy.
>
> It can be done, but is a little messy.
>
> Depending on your setup it may also be possible to copy / move the nodes
> manually by moving sstable files.
>
> I've not done it myself, are you able to run a test ?
>
> Hope that helps.
> Aa
I ran node cleanup on a node in my cluster and discovered the disk usage went
from 3.3 GB to 5.4 GB. Why is this?
I thought cleanup just removed hinted handoff information. I read that
*during* cleanup extra disk space will be used similar to a compaction. But I
was expecting the disk usage
I discovered that a Garbage collection cleans up the unused old SSTables. But
I still wonder whether cleanup really does a full compaction. This would be
undesirable if so.
On Apr 1, 2011, at 4:08 PM, Jonathan Colby wrote:
> I ran node cleanup on a node in my cluster and discovered
minor compactions.
> Compaction thresholds are applied per bucket of files that share a similar
> size, there is normally more smaller files and fewer larger files.
>
> Aaron
>
> On 2 Apr 2011, at 01:45, Jonathan Colby wrote:
>
>> I discovered that a Garbage coll
sly.
Am I missing something or am I just reading the docs wrong ?
Cheers
Aaron
On 4 Apr 2011, at 22:20, Jonathan Colby wrote:
hi Aaron -
The Datastax documentation brought to light the fact that over time,
major compactions will be performed on bigger and bigger SSTables. T
Hi experts,
We have a cluster of 4 nodes across 2 data centers and we are using
OldNetworkTopology to balance the replicas (RF=3).
Question:Can we afford to lose 1 node in a data center and still have
Quorum work?
My understanding is that OldNetworkTopology writes 2 to the "local" data ce
when doing a "nodetool move ", after about 15 minutes I got the below
exception. The cassandra log seems to indicate that the move is still
ongoing. Is this anything to worry about?
Exception in thread "main" java.rmi.UnmarshalException: Error unmarshaling
return header; nested exception
When doing a move, decommission, loadbalance, etc. data is streamed to the
next node in such a way that it really strains the receiving node - to the
point where it has a problem serving requests.
Any way to throttle the streaming of data?
Hi Jonathan -
Would you recommend to disable system swap as a rule? I'm running on Debian
64bit and am seeing light swapping:
total used free sharedbuffers cached
Mem: 8003 7969 33 0 0 4254
-/+ buffers/cache:
I've seen the other posts about memory consumption, but I'm seeing some weird
behavior with 0.7.4 with 5 GB heap size (64 bit system with 8 GB ram
total)...
note the virtual mem used 20.6 GB ?! and Shared 8.4 GB ?!
PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ COMMAND
I added a node to the cluster and I am having a difficult time reassigning the
new tokens.
It seems after a while nothing shows up in the new node's logs and it just
stays in status "Leaving". "nodetool netstats" on all nodes shows "Nothing
streaming to/from".
There is no activity in the
05 22:44:43,978 SSTableReader.java (line
154) Opening /var/lib/cassandra/data/DFS/main-f-129
INFO [CompactionExecutor:1] 2011-04-05 22:46:02,228 SSTableReader.java (line
154) Opening /var/lib/cassandra/data/DFS/main-f-130
On Apr 5, 2011, at 10:46 PM, Jonathan Colby wrote:
>
> I added a node
st how many nodes do you have and whats the RF?
>
> Aaron
>
>
> On 6 Apr 2011, at 01:16, Jonathan Colby wrote:
>
>>
>> When doing a move, decommission, loadbalance, etc. data is streamed to the
>> next node in such a way that it really strains the rece
good to see a discussion on this.
This also has practical use for business continuity where you can control that
the clients in a given data center first write replicas to its own data center,
then to the other data center for backup. If I understand correctly, a write
takes the token into ac
Let's say you have RF of 3 and a write was written to 2 nodes. 1 was not
written because the node had a network hiccup (but came back online again).
My question is, if you are reading a key with a CL of ONE, and you happen to
land on that node that didn't get the write, will the read fail imm
; >
> > - Stephen
> >
> > ---
> > Sent from my Android phone, so random spelling mistakes, random nonsense
> > words and other nonsense are a direct result of using swype to type on the
> > screen
> > On 7 Apr 2011 00:10, "Jonathan Colby" wrote:
&
These types of exceptions is seen sporadically in our cassandra logs. They
occur especially after running a repair with the nodetool.
I assume there are a few "corrupt" rows. Is this cause for panic?
Will a repair fix this, or is it best to do a "decomission + bootstrap" via a
move for exa
It seems on my cluster there are a few unserializable Rows. I'm trying to run
a repair on the nodes, but it also seems that the replica nodes have unreadable
or unserializable rows.The problem is, I cannot determine if the repair is
still going on, or if was interrupted because of these err
I can't explain the technical reason why it's not advisable to bootstrap a
seed. However, from what I've read you would bootstrap the node as a non-seed
first, then add it as seed once it has finished bootstrapping.
On Apr 8, 2011, at 9:30 PM, mcasandra wrote:
> in yaml:
> # Set to true to ma
case. I've added this use case to the
>> comments, please check there if you want to follow along.
>>
>> Cheers
>> Aaron
>>
>>
>> On 6 Apr 2011, at 16:26, Jonathan Colby wrote:
>>
>>> thanks for the response Aaron. Our cluster has 6
It appears we have several unserializable or unreadable rows. These were not
fixed even after doing a "scrub" on all nodes - even though the scrub seemed
to have completed successfully.
I trying to fix these by doing a "repair", but these exceptions are thrown
exactly when doing a repair.
Thanks for the answer Aaron.
There are Data, Index, Filter, and Statistics files associated with SSTables.
What files must be physically moved/deleted?
I tried just moving the Data file and Cassandra would not start. I see this
exception:
WARN [WrapperSimpleAppMain] 2011-04-11 12:04:23,23
Seeing these exceptions on a node during the bootstrap phase of a move .
Cassandra 0.7.4. Anyone able to shed more light on what may be causing this?
btw - the move was done to assign a new token, decommission phase seemed to
have gone ok. bootstrapping is still in progress (i hope)
INFO [
My seed node (1 of 4) having the wraparound range (token 0) needs to be
replaced.
Should I bootstrap the node with a new IP, then add it back as a seed?
Should I run remove token on another node to take over the range?
I shutdown cassandra, deleted (with a backup) the contents of the data
directory and did a "nodetool move 0".It seems to be populating the node
with its range of data.Hope that was a good idea.
On Apr 11, 2011, at 10:38 PM, Jonathan Colby wrote:
>
> My seed node (1 o
had the earlier EOF error during bootstrap ?
>
> Aaron
>
> On 12 Apr 2011, at 08:42, Jonathan Colby wrote:
>
>> I shutdown cassandra, deleted (with a backup) the contents of the data
>> directory and did a "nodetool move 0".It seems to be populating the
This is "normal" when you just add single nodes. When no token is assigned,
the new node takes a portion of the ring from the most heavily loaded node.
As a consequence of this, the nodes will be out of balance.
In other words, when you double the amount nodes you would not have this
probl
>
> And during the time I execute the nodetool move commands, can the cassandra
> servers serve the front end requests at the same time? Is the data safe?
>
> Thanks.
>
> On Tue, Apr 12, 2011 at 5:15 PM, Jonathan Colby
> wrote:
> This is "normal" when you j
There are a few other threads related to problems with the nodetool repair in
0.7.4. However I'm not seeing any errors, just never getting a message that
the repair completed successfully.
In my production and test cluster (with just a few MB data) the repair
nodetool prompt never returns and
"
>
> Repair can hang if a neighbour dies and fails to send a requested stream. It
> will timeout after 24 hours (I think).
>
> Aaron
>
> On 12 Apr 2011, at 23:39, Karl Hiramoto wrote:
>
>> On 12/04/2011 13:31, Jonathan Colby wrote:
>>> There are a
does a repair just compare the existing data from sstables on the node being
repaired, or will it "figure out" which data this node should have and copy it
in?
I'm trying to refresh all the data for a given node (without reassigning the
token) starting with an emptied out data directory.
I tri
0)
progress=0/6003676843 - 0%
Pool NameActive Pending Completed
Commandsn/a 0 5765
Responses n/a 0 9811
On Apr 12, 2011, at 4:59 PM, Jonathan Colby wrote:
> does a repair just co
When the down data center comes back up, the Quorum reads will result in a
read-repair, so you will get valid data. Besides that, hinted handoff will
take care of getting data replicated to a previously down node.
You're example is a little unrealistic because you could theoretically have a
D
how long as it been in Leaving status? Is the cluster under stress test load
while you are doing the decommission?
On Apr 12, 2011, at 6:53 PM, Baskar Duraikannu wrote:
> I have setup a 4 node cluster for testing. When I setup the cluster, I have
> setup initial tokens in such a way that each
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