Very appreciate to all of you, I’ll study the blog.
From: Alain RODRIGUEZ [mailto:arodr...@gmail.com]
Sent: 2016年11月16日 23:26
To: user@cassandra.apache.org
Cc: Fabrice Facorat
Subject: Re: Some questions to updating and tombstone
Hi Boying,
Old value is not tombstone, but remains until
bstoneSca
>> nnedHistogram,scope=,type=ColumnFamily Max/Count/99thPercentile/Mean
>>
>>
>> 2016-11-15 10:05 GMT+01:00 Lu, Boying :
>>
>>> Thanks a lot for your help.
>>>
>>>
>>>
>>> We are using STCS strategy and not using TTL
>>>
; 2016-11-15 10:05 GMT+01:00 Lu, Boying :
>
>> Thanks a lot for your help.
>>
>>
>>
>> We are using STCS strategy and not using TTL
>>
>>
>>
>> Is there any API that we can use to query the current number of
>> tombstones in a CF?
>&
lot for your help.
>
>
>
> We are using STCS strategy and not using TTL
>
>
>
> Is there any API that we can use to query the current number of tombstones
> in a CF?
>
>
>
>
>
>
>
> *From:* Anuj Wadehra [mailto:anujw_2...@yahoo.co.in]
> *Sent:* 2
Thanks a lot for your help.
We are using STCS strategy and not using TTL
Is there any API that we can use to query the current number of tombstones in a
CF?
From: Anuj Wadehra [mailto:anujw_2...@yahoo.co.in]
Sent: 2016年11月14日 22:20
To: user@cassandra.apache.org
Subject: Re: Some questions to
Hi Boying,
I agree with Vladimir.If compaction is not compacting the two sstables with
updates soon, disk space issues will be wasted. For example, if the updates are
not closer in time, first update might be in a big table by the time second
update is being written in a new small table. STCS wo
Hi Boying,
UPDATE write new value with new time stamp. Old value is not tombstone, but
remains until compaction. gc_grace_period is not related to this.
Best regards, Vladimir Yudovin,
Winguzone - Hosted Cloud Cassandra
Launch your cluster in minutes.
On Mon, 14 Nov 2016 03:02:21
Hi, All,
Will the Cassandra generates a new tombstone when updating a column by using
CQL update statement?
And is there any way to get the number of tombstones of a column family since
we want to void generating
too many tombstones within gc_grace_period?
Thanks
Boying
You forgot FROM in your CQL query.
Jens
Den sön 26 juni 2016 08:30lowping skrev:
> Hi :
>
>
> question 1:
>
> I got a error about this cql， have you fix it already ？？？
> select collection_type where id in (‘a’,’b’)
>
> question 2:
>
> I want use UDF in update, but this cql can’t execute. have
Hi :
question 1:
I got a error about this cql， have you fix it already ？？？
select collection_type where id in (‘a’,’b’)
question 2:
I want use UDF in update, but this cql can’t execute. have some advise？？？
update table_name set field=my_function(field) where…
tnk u so much
Hi All.
We have a scenario, where the Application-Server (APP), Node-1 (CAS11), and
Node-2 (CAS12) are hosted in DC1.
Node-3 (CAS21) and Node-4 (CAS22) are in DC2.
The intention is that we provide 4-way redundancy to APP, by specifying
CAS11, CAS12, CAS21 and CAS22 as the addresses via Java-Cassa
On Wed, Apr 30, 2014 at 10:21 AM, Arindam Barua wrote:
> Since we don’t change the seeds configuration in the yaml files of DC1 and
> DC2, how do DC1 and DC2 know the nodes in the DC3 if they reboot for some
> reason later?
Additional note: you want to have at least one seed node per availabili
Answers inline.
From: Lu, Boying [mailto:boying...@emc.com]
Sent: Wednesday, April 30, 2014 12:20 AM
To: user@cassandra.apache.org
Subject: Some questions to adding a new datacenter into cassandra cluster.
Hi, All,
I need to add a Cassandra (running on a three nodes) fresh installed in a
Hi, All,
I need to add a Cassandra (running on a three nodes) fresh installed in a
datacenter say DC3 to existing Cassandra datacenters say DC1 and DC2.
I read the document about it at
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html
But I h
On Thu, Jul 8, 2010 at 10:45 PM, ChingShen wrote:
> Ok, If so, I suppose that A sends requests to B, C and D nodes(RF=3) at
> CL.QUORUM, but D is down, then return success message to the client, and A
> write a hint to E node? until D comes back up then E forwards the data to D?
If it knows that
On Fri, Jul 9, 2010 at 4:32 AM, Jonathan Ellis wrote:
> If the coordinator knows it can't achieve the requested CL it won't do
> any writes, hinted or otherwise, and will immediately report
> UnavailableException to the client.
> To summarize: hinted writes are only generated when Cassandra (a)
>
Right, if the nodes are marked up but do not confirm the writes, it
will result in a TimedOutException. (It still won't generate hinted
writes).
To summarize: hinted writes are only generated when Cassandra (a)
knows a target is down ahead of time and (b) still has enough UP
targets to satisfy th
To clarify, this requires the coordinator know nodes are down. If the
nodes are marked UP, but do not confirm the writes, this behavior does
not seem possible.
On Thu, Jul 8, 2010 at 11:31 AM, Jonathan Ellis wrote:
> On Thu, Jul 8, 2010 at 1:19 PM, Benjamin Black wrote:
>> On Thu, Jul 8, 2010 a
Important safety tip, I did not know that.
On Thu, Jul 8, 2010 at 11:31 AM, Jonathan Ellis wrote:
> On Thu, Jul 8, 2010 at 1:19 PM, Benjamin Black wrote:
>> On Thu, Jul 8, 2010 at 9:02 AM, ChingShen wrote:
>>> Hmm.. as you mentioned that it will write a hint and report success at
>>> CL.ANY, do
On Thu, Jul 8, 2010 at 1:19 PM, Benjamin Black wrote:
> On Thu, Jul 8, 2010 at 9:02 AM, ChingShen wrote:
>> Hmm.. as you mentioned that it will write a hint and report success at
>> CL.ANY, does the hinted handoff only work at CL.ANY?
>>
>
> Still no. Hints are written when nodes are down, regar
On Thu, Jul 8, 2010 at 9:02 AM, ChingShen wrote:
> Hmm.. as you mentioned that it will write a hint and report success at
> CL.ANY, does the hinted handoff only work at CL.ANY?
>
Still no. Hints are written when nodes are down, regardless of CL,
unless HH is disabled. CL does not influence whet
Hmm.. as you mentioned that it will *write a hint *and report success at
CL.ANY, does the hinted handoff only work at CL.ANY?
Thanks.
On Thu, Jul 8, 2010 at 11:29 PM, Jonathan Ellis wrote:
> On Thu, Jul 8, 2010 at 10:23 AM, ChingShen
> wrote:
> > Thanks Jonathan Ellis,
> >
> > I want to make
On Thu, Jul 8, 2010 at 10:23 AM, ChingShen wrote:
> Thanks Jonathan Ellis,
>
> I want to make sure that after A return failure message to client at
> CL.ONE, does A write a hint to C?
No.
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cass
Thanks Jonathan Ellis,
I want to make sure that after A return failure message to client at
CL.ONE, *does A write a hint to C?* If so, although the write operation is
failed, but the data is still stored in C? if B comes back up, then C
forwards to B?
Shen
On Thu, Jul 8, 2010 at 10:08 PM, Jona
On Thu, Jul 8, 2010 at 12:45 AM, ChingShen wrote:
> hmm... I'm really confused.
> The http://wiki.apache.org/cassandra/API document mentioned that if write
> ConsistencyLevel=ANY that "Ensure the write has been written to at least 1
> node, including hinted recipients.", I couldn't imagine this ca
hmm... I'm really confused.
The http://wiki.apache.org/cassandra/API document mentioned that if write
ConsistencyLevel=ANY that "Ensure the write has been written to at least 1
node, including hinted recipients.", I couldn't imagine this case. :(
If I have A,B,C and D nodes(RF=1), and write Consis
No, it means that HH writes don't count towards meeting the requested
ConsistencyLevel.
On Wed, Jul 7, 2010 at 9:36 PM, ChingShen wrote:
> So, does it mean that only the CL=ZERO and CL=ANY support hinted handoff,
> right?
>
> Thanks.
>
> Shen
>
> On Wed, Jul 7, 2010 at 11:28 PM, Jonathan Ellis w
So, does it mean that only the CL=ZERO and CL=ANY support hinted handoff,
right?
Thanks.
Shen
On Wed, Jul 7, 2010 at 11:28 PM, Jonathan Ellis wrote:
> does http://wiki.apache.org/cassandra/HintedHandoff help?
>
> On Wed, Jul 7, 2010 at 10:16 AM, ChingShen
> wrote:
> > Thanks Jonathan Ellis,
>
does http://wiki.apache.org/cassandra/HintedHandoff help?
On Wed, Jul 7, 2010 at 10:16 AM, ChingShen wrote:
> Thanks Jonathan Ellis,
>
> If so, how does the hinted handoff work? I thought the coordinator node
> will write the data to another node(e.g. G node), I'm confused.
>
> Shen
>
>>
>> > S
Thanks Jonathan Ellis,
If so, how does the hinted handoff work? I thought the coordinator node
will write the data to another node(e.g. G node), I'm confused.
Shen
> > Second, if
> > B node is down during the write operation, does it return failure(CL=ALL)
> to
> > user?
>
> yes
>
> --
> Jona
On Tue, Jul 6, 2010 at 10:05 PM, ChingShen wrote:
> Hi all,
>
> I have A, B, C, D, E, F and G nodes(RF=3), if I run a write
> operation(CL=ALL) on "A" node(coordinator), and the key range between A and
> B, therefore, the data will be stored on B, C and D nodes, right?
depends on replication st
Hi all,
I have A, B, C, D, E, F and G nodes(RF=3), if I run a write
operation(CL=ALL) on "A" node(coordinator), and the key range between A and
B, therefore, the data will be stored on B, C and D nodes, right? Second, if
B node is down during the write operation, does it return failure(CL=ALL) t
Thursday, 17 June 2010 5:46 PM
> To: user@cassandra.apache.org
> Subject: Re: Some questions about using Cassandra
>
> On Thu, Jun 17, 2010 at 1:20 AM, Anthony Ikeda
> wrote:
>> Thanks Gary, I'm looking at that plug-in feature at the moment but there
>> seem
Thanks Sylvia, I would like to actually do that actually. Any idea how I can
get started?
-Original Message-
From: Sylvain Lebresne [mailto:sylv...@yakaz.com]
Sent: Thursday, 17 June 2010 5:46 PM
To: user@cassandra.apache.org
Subject: Re: Some questions about using Cassandra
On Thu
distributed database it’s going to be used more for a
> cache or our database. As I said this process depends on which sync protocol
> we decide on (messaging, clustering, cloud, etc).
>
>
>
> Anthony
>
>
>
>
>
> From: Gary Dusbabek [mailto:gdusba...@gmail
g, cloud, etc).
Anthony
From: Gary Dusbabek [mailto:gdusba...@gmail.com]
Sent: Thursday, 17 June 2010 2:20 AM
To: user@cassandra.apache.org
Subject: Re: Some questions about using Cassandra
On Tue, Jun 15, 2010 at 19:49, Anthony Ikeda
wrote:
Is there any concept of Listeners s
On Tue, Jun 15, 2010 at 19:49, Anthony Ikeda
wrote:
> Is there any concept of Listeners such that when data is added to Cassandra
> we can fire off another process to do something with that data? E.g. create
> a copy in a secondary database for Business Intelligence reports? Send the
> data to an
Anthony Ikeda cardlink.com.au> writes:
> One factor I need to consider is our Business
> Intelligence platform that will need to use the data stored for reporting
> purposes.
>
>
>
> We are looking at using Cassandra for our real-time layer for
> Active-Active data centre use and perhaps have
Thanks Benjamin. Looking at the 'plugins' now :)
-Original Message-
From: Benjamin Black [mailto:b...@b3k.us]
Sent: Wednesday, 16 June 2010 11:35 AM
To: user@cassandra.apache.org
Subject: Re: Some questions about using Cassandra
On Tue, Jun 15, 2010 at 6:07 PM, Anthony Ik
On 6/15/10 6:35 PM, Benjamin Black wrote:
jmhodges contributed a patch (I remain incompetent at Jira searches)
for 'coprocessors' to do what you want. That'd be where I'd start
looking.
https://issues.apache.org/jira/browse/CASSANDRA-1016
=Rob
https://issues.apache.org/jira/browse/CASSANDRA-1016
'Plugins', excuse me.
b
On Tue, Jun 15, 2010 at 6:07 PM, Anthony Ikeda
wrote:
>
> Thanks Jonathan, I was only asking about the event listeners because an
> alternative we are considering is TIBCO Active Spaces which draws quite a lot
> of parallels to Cassandra.
>
>
Based on painful production experience, I would not
have Oracle installed
alongside for non-real-time use such that data is mediated to the Oracle
database for other uses.
Anthony
From: Jonathan Shook [mailto:jsh...@gmail.com]
Sent: Wednesday, 16 June 2010 10:58 AM
To: user@cassandra.apache.org
Subject: Re: Some questions about using
requirements go.
>
>
>
> On Tue, Jun 15, 2010 at 7:49 PM, Anthony Ikeda <
> anthony.ik...@cardlink.com.au> wrote:
>
>> We are currently looking at a distributed database option and so far
>> Cassandra ticks all the boxes. However, I still have some questions.
>>
>&
ra ticks all the boxes. However, I still have some questions.
>
>
>
> Is there any need for archiving of Cassandra and what backup options are
> available? As it is a no-data-loss system I’m guessing archiving is not
> exactly relevant.
>
>
>
> Is there any concept of
We are currently looking at a distributed database option and so far
Cassandra ticks all the boxes. However, I still have some questions.
Is there any need for archiving of Cassandra and what backup options are
available? As it is a no-data-loss system I'm guessing archiving is not
ex
On Wed, May 19, 2010 at 1:37 AM, Peng Guo wrote:
> Thanks for you information.
>
> I look at some source code of the implement. There still some question:
>
> 1 How did I know that the binary write message send to endpoint success?
It doesn't. It's fire-and-forget. If you look at the example it
> But after I look at the wiki
> > intro:http://wiki.apache.org/cassandra/BinaryMemtable
> >
> > I have some questions about using BinaryMemtable
> >
> > Will the data be replicated automatic？
> > Can we modify the data that already exist in Cassandra?
> > W
ache.org/cassandra/BinaryMemtable
>
> I have some questions about using BinaryMemtable
>
> Will the data be replicated automatic？
> Can we modify the data that already exist in Cassandra?
> What will happen if we not turn off compaction?
> What will happen if the data beyond the limite
Hi All:
I am trying to use Binary Memtable to import a large number of data.
But after I look at the wiki intro:
http://wiki.apache.org/cassandra/BinaryMemtable
I have some questions about using BinaryMemtable
1. Will the data be replicated automatic？
2. Can we modify the data that
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