witch
into IR sstables with more caveats. Probably worth a jira to add a faster
solution
On Thu, Feb 15, 2024 at 12:50 PM Kristijonas Zalys wrote:
> Hi folks,
>
> One last question regarding incremental repair.
>
> What would be a safe approach to temporarily stop running incre
running out of disk space, and you should address
that issue first before even considering upgrading Cassandra.
On 15/02/2024 18:49, Kristijonas Zalys wrote:
Hi folks,
One last question regarding incremental repair.
What would be a safe approach to temporarily stop running incremental
repair
Hi folks,
One last question regarding incremental repair.
What would be a safe approach to temporarily stop running incremental
repair on a cluster (e.g.: during a Cassandra major version upgrade)? My
understanding is that if we simply stop running incremental repair, the
cluster's nodes ca
The over-streaming is only problematic for the repaired SSTables, but it
can be triggered by inconsistencies within the unrepaired SSTables
during an incremental repair session. This is because although an
incremental repair will only compare the unrepaired SSTables, but it
will stream both
Thank you very much for your explanation.
Streaming happens on the token range level, not the SSTable level, right? So,
when running an incremental repair before the full repair, the problem that
“some unrepaired SSTables are being marked as repaired on one node but not on
another” should not
y this for me.
So far, I assumed that a full repair on a cluster that is also using
incremental repair pretty much works like on a cluster that is not using
incremental repair at all, the only difference being that the set of repaired
und unrepaired data is repaired separately, so the Merkle trees
if you could clarify this for me.
So far, I assumed that a full repair on a cluster that is also using
incremental repair pretty much works like on a cluster that is not using
incremental repair at all, the only difference being that the set of repaired
und unrepaired data is repaired separately,
Caution, using the method you described, the amount of data streamed at
the end with the full repair is not the amount of data written between
stopping the first node and the last node, but depends on the table
size, the number of partitions written, their distribution in the ring
and the 'repa
> That's a feature we need to implement in Reaper. I think disallowing the
> start of the new incremental repair would be easier to manage than pausing
> the full repair that's already running. It's also what I think I'd expect as
> a user.
>
> I'l
> Full repair running for an entire week sounds excessively long. Even if
> you've got 1 TB of data per node, 1 week means the repair speed is less than
> 2 MB/s, that's very slow. Perhaps you should focus on finding the bottleneck
> of the full repair speed and work on that instead.
We store a
Just one more thing. Make sure you run 'nodetool repair -full' instead
of just 'nodetool repair'. That's because the command's default was
changed in Cassandra 2.x. The default was full repair before that
change, but the new default now is incremental repair.
O
ration?
Thanks,
Kristijonas
On Sun, Feb 4, 2024 at 12:18 AM Alexander DEJANOVSKI
wrote:
Hi Sebastian,
That's a feature we need to implement in Reaper. I think
disallowing the start of the new incremental repair would be
easier to manage than pausing the full repair tha
t in Reaper. I think disallowing the
> start of the new incremental repair would be easier to manage than pausing
> the full repair that's already running. It's also what I think I'd expect
> as a user.
>
> I'll create an issue to track this.
>
> Le sam. 3 févr. 2024,
Hi Sebastian,
That's a feature we need to implement in Reaper. I think disallowing the
start of the new incremental repair would be easier to manage than pausing
the full repair that's already running. It's also what I think I'd expect
as a user.
I'll create an issue
y leave it till Monday morning
if it happens at Friday night.
Does anyone know how such a schedule can be created in Cassandra Reaper?
I recently learned the hard way that running both a full and an
incremental repair for the same keyspace and table in parallel is not
a good idea (it cau
orning if it happens at Friday night.
>
Does anyone know how such a schedule can be created in Cassandra Reaper?
I recently learned the hard way that running both a full and an incremental
repair for the same keyspace and table in parallel is not a good idea (it
caused a very unpleasant overlo
Hi Kristijonas,
It is not possible to run two repairs, regardless whether they are
incremental or full, for the same token range and on the same table
concurrently. You have two options:
1. create a schedule that's don't overlap, e.g. run incremental repair
daily except the 1
> Thanks,
> Kristijonas
>
> On Fri, Feb 2, 2024 at 3:36 PM Bowen Song via user <
> user@cassandra.apache.org> wrote:
>
>> Hi Kristijonas,
>>
>> To answer your questions:
>>
>> 1. It's still necessary to run full repair on a cluster on which
&g
at 3:36 PM Bowen Song via user <
user@cassandra.apache.org> wrote:
> Hi Kristijonas,
>
> To answer your questions:
>
> 1. It's still necessary to run full repair on a cluster on which
> incremental repair is run periodically. The frequency of full repair is
> more o
Hi Kristijonas,
To answer your questions:
1. It's still necessary to run full repair on a cluster on which
incremental repair is run periodically. The frequency of full repair is
more of an art than science. Generally speaking, the less reliable the
storage media, the more frequently
Hi folks,
I am working on switching from full to incremental repair in Cassandra
v4.0.6 (soon to be v4.1.3) and I have a few questions.
1.
Is it necessary to run regular full repair on a cluster if I already run
incremental repair? If yes, what frequency would you recommend for full
IR by disabling auto compaction . It sounds very much out of date or
its optimized for fixing one node in a cluster somehow. It didn’t make
sense in the 4.0 era.
Instead I’d leave compaction running and slowly run incremental repair
across parts of the token range, slowing down as pending compac
era.
Instead I’d leave compaction running and slowly run incremental repair across
parts of the token range, slowing down as pending compactions increase
I’d choose token ranges such that you’d repair 5-10% of the data on each node
at a time
> On Nov 23, 2023, at 11:31 PM, Sebast
Hi Sebastian,
It's better to walk down the path on which others have walked before you
and had great success, than a path that nobody has ever walked. For the
former, you know it's relatively safe and it works. The same can hardly
be said for the later.
You said it takes a week to run the fu
Hi,
we are currently in the process of migrating from C* 3.11 to C* 4.1 and we want
to start using incremental repairs after the upgrade has been completed. It
seems like all the really bad bugs that made using incremental repairs
dangerous in C* 3.x have been fixed in 4.x, and for our specific
incremental repair?
No flag currently exists. Probably a good idea considering the serious issues
with incremental repairs since forever, and the change of defaults since 3.0.
On 7 August 2018 at 16:44, Steinmaurer, Thomas
mailto:thomas.steinmau...@dynatrace.com>>
wrote:
Hello,
we are r
Yeah I meant 2.2. Keep telling myself it was 3.0 for some reason.
On 20 August 2018 at 19:29, Oleksandr Shulgin
wrote:
> On Mon, Aug 13, 2018 at 1:31 PM kurt greaves wrote:
>
>> No flag currently exists. Probably a good idea considering the serious
>> issues with incremental repairs since forev
andra 3.11.2 ,while
> enabling repair noticed that incremental repair is true in logfile.
>
>
> (parallelism: parallel, primary range: true, incremental: true, job
> threads: 1, ColumnFamilies: [], dataCenters: [], hosts: [], # of ranges:
> 20, pull repair: false)
>
> i was running
Hi Community,
I am currently creating a new cluster with cassandra 3.11.2 ,while enabling
repair noticed that incremental repair is true in logfile.
(parallelism: parallel, primary range: true, incremental: true, job
threads: 1, ColumnFamilies: [], dataCenters: [], hosts: [], # of ranges:
20
On Mon, Aug 13, 2018 at 1:31 PM kurt greaves wrote:
> No flag currently exists. Probably a good idea considering the serious
> issues with incremental repairs since forever, and the change of defaults
> since 3.0.
>
Hi Kurt,
Did you mean since 2.2 (when incremental became the default one)? Or
No flag currently exists. Probably a good idea considering the serious
issues with incremental repairs since forever, and the change of defaults
since 3.0.
On 7 August 2018 at 16:44, Steinmaurer, Thomas <
thomas.steinmau...@dynatrace.com> wrote:
> Hello,
>
>
>
> we are running Cassandra in AWS an
Hello,
we are running Cassandra in AWS and On-Premise at customer sites, currently 2.1
in production with 3.11 in loadtest.
In a migration path from 2.1 to 3.11.x, I'm afraid that at some point in time
we end up in incremental repairs being enabled / ran a first time
unintentionally, cause:
a)
Thanks for your reply, Blake
So what's your advise, as you say the incremental repair has some flaws, should
i use it mixed with full repair or just run full repair only ?
Dayu
At 2017-11-02 20:42:14, "Blake Eggleston" wrote:
Because in theory, corruption of your repa
Because in theory, corruption of your repaired dataset is possible, which
incremental repair won’t fix.
In practice pre-4.0 incremental repair has some flaws that can bring deleted
data back to life in some cases, which this would address.
You should also evaluate whether pre-4.0 incremental
https://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsRepairNodesWhen.html
So you means i am misleading by this statements. The full repair only needed
when node failure + replacement, or adding a datacenter. right?
At 2017-11-02 15:54:49, "kurt greaves" wrote:
Where are you se
Where are you seeing this? If your incremental repairs work properly, full
repair is only needed in certain situations, like after node failure +
replacement, or adding a datacenter.
Hello everyone,
I have used cassandra for a while, the version is 3.0.9. I have a question why
does cassandra still need full repair after used incremental repair?
the full repair takes too long time. And I have searched a lot， but didn’t
found any suitable answer.
Can anyone answer my
eed to mark
> sstables as unrepaired?
That's right, but he mentioned that he is using reaper which uses
subrange repair if I'm not mistaken, which doesn't do anti-compaction.
So in that case he should probably mark data as unrepaired when no
longer using incremental repair.
ir if I'm not mistaken, which doesn't do anti-compaction.
So in that case he should probably mark data as unrepaired when no
longer using incremental repair.
2017-10-31 3:52 GMT+11:00 Blake Eggleston :
>> Once you run incremental repair, your data is permanently marked as
>> repaired
> Once you run incremental repair, your data is permanently marked as repaired
This is also the case for full repairs, if I'm not mistaken. I'll admit I'm not
as familiar with the quirks of repair in 2.2, but prior to 4.0/CASSANDRA-9143,
any global repair ends with an anticom
Yes mark them as unrepaired first. You can get sstablerepairedset from
source if you need (probably make sure you get the correct branch/tag).
It's just a shell script so as long as you have C* installed in a
default/canonical location it should work.
https://github.com/apache/cassandra/blob/trunk/
et back to my non incremental repair regiment.
I assume that I should mark the SSTs to un repaired first and then run a full
repair?
Also, although I am installing Cassandra from package dsc22 on my CentOS 7 I
couldn't find sstable tools installed, need to figu
> Assuming the situation is just "we accidentally ran incremental repair", you
> shouldn't have to do anything. It's not going to hurt anything
Once you run incremental repair, your data is permanently marked as
repaired, and is no longer compacted with new non-increme
Hey Aiman,
Assuming the situation is just "we accidentally ran incremental repair", you
shouldn't have to do anything. It's not going to hurt anything. Pre-4.0
incremental repair has some issues that can cause a lot of extra streaming, and
inconsistencies in some edge c
Hi everyone,
We seek your help in a issue we are facing in our 2.2.8 version.
We have 24 nodes cluster spread over 3 DCs.
Initially, when the cluster was in a single DC we were using The Last Pickle
reaper 0.5 to repair it with incremental repair set to false. We added 2 more
DCs. Now the
> there are some nasty edge cases when you mix incremental repair and full
repair ( https://issues.apache.org/jira/browse/CASSANDRA-13153 )
mixing incremental and full repairs will just make that more likely to
happen, but although unlikely it's still possible for a similar condition
t
On 2017-03-12 10:44 (-0700), Anuj Wadehra wrote:
> Hi,
>
> Our setup is as follows:
> 2 DCS with N nodes, RF=DC1:3,DC2:3, Hinted Handoff=3 hours, Incremental
> Repair scheduled once on every node (ALL DCs) within the gc grace period.
>
> I have following queries
Hi,
Our setup is as follows:
2 DCS with N nodes, RF=DC1:3,DC2:3, Hinted Handoff=3 hours, Incremental Repair
scheduled once on every node (ALL DCs) within the gc grace period.
I have following queries regarding incremental repairs:
1. When a node is down for X hours (where x > hinted hand
Hi,
Recently I have enabled incremental repair in one of my test cluster setup
which consists of 8 nodes(DC1 - 4, DC2 - 4) with C* version of 2.1.13.
Currently, I am facing node failure scenario in this cluster with the
following exception during the incremental repair process
exception occurred
the case, you may have to increase segment timeout
when you run it for the first time as it repairs whole set of sstables.
Regards,
Bhuvan
On Jan 10, 2017 8:44 PM, "Jonathan Haddad" wrote:
Reaper suppers incremental repair.
On Mon, Jan 9, 2017 at 11:27 PM Amit Singh F
wr
Reaper suppers incremental repair.
On Mon, Jan 9, 2017 at 11:27 PM Amit Singh F
wrote:
> Hi Jonathan,
>
>
>
> Really appreciate your response.
>
>
>
> It will not be possible for us to move to Reaper as of now, we are in
> process to migrate to Incremental repai
Hi Jonathan,
Really appreciate your response.
It will not be possible for us to move to Reaper as of now, we are in process
to migrate to Incremental repair.
Also Running repair constantly will be costly affair in our case . For
migrating to incremental repair with large set of dataset will
primary range repair (-pr) to
> incremental repair.
>
>
>
> Environment :
>
>
>
> · Cassandra 2.1.16
>
> • 25 Node cluster ,
>
> • RF 3
>
> • Data size up to 450 GB per nodes
>
>
>
> We found that running full repair will b
Hi All,
We are thinking of migrating from primary range repair (-pr) to incremental
repair.
Environment :
* Cassandra 2.1.16
* 25 Node cluster ,
* RF 3
* Data size up to 450 GB per nodes
We found that running full repair will be taking around 8 hrs per node which
means
ght be helpful to you :
>
>
>
> https://support.datastax.com/hc/en-us/articles/208040036-
> Nodetool-upgradesstables-FAQ
>
>
>
> *From:* Kathiresan S [mailto:kathiresanselva...@gmail.com
> ]
> *Sent:* Wednesday, January 04, 2017 12:22 AM
> *To:* user@cassandra.
; From: Kathiresan S [mailto:kathiresanselva...@gmail.com]
> Sent: Wednesday, January 04, 2017 12:22 AM
> To: user@cassandra.apache.org
> Subject: Re: Incremental repair for the first time
>
> Thank you!
>
> We are planning to upgrade to 3.0.10 for this issue.
>
&
/hc/en-us/articles/208040036-Nodetool-upgradesstables-FAQ
From: Kathiresan S [mailto:kathiresanselva...@gmail.com]
Sent: Wednesday, January 04, 2017 12:22 AM
To: user@cassandra.apache.org
Subject: Re: Incremental repair for the first time
Thank you!
We are planning to upgrade to 3.0.10 for this
and new Cassandra cluster (version 3.0.4) and we set up
>>>> nodetool repair scheduled for every day (without any options for repair).
>>>> As per documentation, incremental repair is the default in this case.
>>>> Should we do a full repair for the very first time
w Cassandra cluster (version 3.0.4) and we set up
>>> nodetool repair scheduled for every day (without any options for repair).
>>> As per documentation, incremental repair is the default in this case.
>>> Should we do a full repair for the very first time on each node once a
; > wrote:
>
>> Hi,
>>
>> We have a brand new Cassandra cluster (version 3.0.4) and we set up
>> nodetool repair scheduled for every day (without any options for repair).
>> As per documentation, incremental repair is the default in this case.
>> Should we do
r documentation, incremental repair is the default in this case.
> Should we do a full repair for the very first time on each node once and
> then leave it to do incremental repair afterwards?
>
> *Problem we are facing:*
>
> On a random node, the repair process throws validation
Hi,
We have a brand new Cassandra cluster (version 3.0.4) and we set up
nodetool repair scheduled for every day (without any options for repair).
As per documentation, incremental repair is the default in this case.
Should we do a full repair for the very first time on each node once and
then
Hi, do I have to do a full repair after scrub? Is it enough to just do
incremental repair? BTW I do nightly incremental repair.
d and it worked but my question is if the passed value of
> incremental repair flag is different from the existing value then it
> should allow to create new repair_unit instead of getting repair_unit based
> on cluster name/ keyspace /column combination.
>
> and also if i dele
Hi Alex,
that i already did and it worked but my question is if the passed value of
incremental repair flag is different from the existing value then it
should allow to create new repair_unit instead of getting repair_unit based
on cluster name/ keyspace /column combination.
and also if i
Hi Abhishek,
This shows you have two repair units for the same keyspace/table with
different incremental repair settings.
Can you delete your prior repair run (the one with incremental repair set
to false) and then create the new one with incremental repair set to true ?
Let me know how that
is there a way to start the incremental repair using the reaper. we
completed full repair successfully and after that i tried to run the
incremental run but getting the below error.
A repair run already exist for the same cluster/keyspace/table but with a
different incremental repair
> - Either way, with or without the flag will actually be equivalent when
> none of the sstables are marked as repaired (this will change after the
> first inc repair).
>
So, if I well understand, the repair -full -local command resets the flag
of sstables previously repaired. So even if I had som
ag does not mark sstables as repaired, since
>> you can't guarantee data in other DCs are repaired. In order to support
>> incremental repair, you need to run a full repair without the -local flag,
>> and then in the next time you run repair, previously repaired sstabl
t break sstable file
immutability, so I wonder how it is stored.
--
Jérôme Mainaud
jer...@mainaud.com
2016-08-19 15:02 GMT+02:00 Paulo Motta :
> Running repair with -local flag does not mark sstables as repaired, since
> you can't guarantee data in other DCs are repaired. In order to su
Running repair with -local flag does not mark sstables as repaired, since
you can't guarantee data in other DCs are repaired. In order to support
incremental repair, you need to run a full repair without the -local flag,
and then in the next time you run repair, previously repaired sstable
Hello,
I have a 2.2.6 Cassandra cluster with two DC of 15 nodes each.
A continuous incremental repair process deal with anti-entropy concern.
Due to some untraced operation by someone, we choose to do a full repair on
one DC with the command : nodetool repair --full -local -j 4
Daily
the migration
steps in order to migrate to incremental repair (because we have tables
with LCS)
http://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsRepairNodesMigration.html
I've few questions around this:
- Do we need *the migration steps* in first place to swit
Hi,
I am running a cluster with 2.2.4. I have some table on LCS and plan to use
incremental repair. I read the post at
http://www.datastax.com/dev/blog/anticompaction-in-cassandra-2-1 and am a
little confused.
especially:
"This means that *once you do an incremental repair you will ha
ull repairs and our test cluster has been re-purposed for
> other tasks atm. I will be sure to apply the patch/try a fixed version of
> Cassandra if we attempt to migrate to incremental repair again.
>
Ah Marcus, that looks very promising- unfortunately we have already
switched back to full repairs and our test cluster has been re-purposed for
other tasks atm. I will be sure to apply the patch/try a fixed version of
Cassandra if we attempt to migrate to incremental repair again.
Bryan, this should be improved with
https://issues.apache.org/jira/browse/CASSANDRA-10768 - could you try it
out?
On Tue, Dec 1, 2015 at 10:58 PM, Bryan Cheng wrote:
> Sorry if I misunderstood, but are you asking about the LCS case?
>
> Based on our experience, I would absolutely recommend you c
Sorry if I misunderstood, but are you asking about the LCS case?
Based on our experience, I would absolutely recommend you continue with the
migration procedure. Even if the compaction strategy is the same, the
process of anticompaction is incredibly painful. We observed our test
cluster running 2
/Marcus
On Tue, Dec 1, 2015 at 3:24 PM, Sam Klock wrote:
> Hi folks,
>
> A question like this was recently asked, but I don't think anyone ever
> supplied an unambiguous answer. We have a set of clusters currently
> using sequential repair, and we'd like to transition the
Hi folks,
A question like this was recently asked, but I don't think anyone ever
supplied an unambiguous answer. We have a set of clusters currently
using sequential repair, and we'd like to transition them to
incremental repair. According to the documentation, this is a very
m
r once every gc_grace_seconds, unless
you never do anything that results in a tombstone. In that (very rare)
case, one should probably still occasionally (2x a year?) run repair to
cover bitrot and similar (very rare) cases.
"Something that amounts to full repair" is either a full repair or an
i
Following up on this older question: as per the docs, one *should* still do
full repair periodically (the docs say weekly), right? And run incremental
more often to fill in?
Starting up fresh it is totally OK to just start using incremental repairs
On Thu, Sep 3, 2015 at 10:25 PM, Jean-Francois Gosselin <
jfgosse...@gmail.com> wrote:
>
> On fresh install of Cassandra what's the best approach to start using
> incremental repair from the g
On fresh install of Cassandra what's the best approach to start using
incremental repair from the get go (I'm using LCS) ?
Run nodetool repair -inc after inserting a few rows , or we still need to
follow the migration procedure with sstablerepairedset ?
>From the documentation &q
t;> - If CPU is a limit, then some tuning around compactions or GC might be
>>> needed (or a few more things)
>>> - if you have Disk IO limitations, you might want to add machines or
>>> tune compaction throughput
>>> - If your network is the issue, there are
- if you have Disk IO limitations, you might want to add machines or tune
>> compaction throughput
>> - If your network is the issue, there are commands to tune the bandwidth
>> used by streams.
>>
>> You need to troubleshot this and give us more informations. I hope yo
ut
> - If your network is the issue, there are commands to tune the bandwidth
> used by streams.
>
> You need to troubleshot this and give us more informations. I hope you
> have a monitoring tool up and running and an easy way to detect errors on
> your logs.
>
> C*heers,
>
ou have
a monitoring tool up and running and an easy way to detect errors on your
logs.
C*heers,
Alain
2015-06-26 16:26 GMT+02:00 Carl Hu :
> Dear colleagues,
>
> We are using incremental repair and have noticed that every few repairs,
> the cluster experiences pauses.
>
> We run
Dear colleagues,
We are using incremental repair and have noticed that every few repairs,
the cluster experiences pauses.
We run the repair with the following command: nodetool repair -par -inc
I have tried to run it not in parallel, but get the following error:
"It is not possible t
On Fri, Oct 31, 2014 at 8:55 AM, Juho Mäkinen
wrote:
> I can't yet call this conclusive, but it seems that I can't run
> incremental repairs on the current 2.1.1 and I'm still wondering if anybody
> else is experiencing the same problem.
>
You have repro steps, if I were you I would file an JIRA
for adding logging info, but I'll most probably end up adding the logging
by myself and I'll start digging through into the actual root cause.
I also ran one nodetool repair -par (ie. without incremental repair) and it
seems that the repair started. Guess I need to go over the sources if
No, the cluster seems to be performing just fine. It seems that the
prepareForRepair callback() could be easily modified to print which node(s)
are unable to respond, so that the debugging effort could be focused
better. This of course doesn't help this case as it's not trivial to add
the log lines
It appears to come from the ActiveRepairService.prepareForRepair portion of the
Code.
Are you sure all nodes are reachable from the node you are initiating repair
on, at the same time?
Any Node up/down/died messages?
Rahul Neelakantan
> On Oct 30, 2014, at 6:37 AM, Juho Mäkinen wrote:
>
> I
I'm having problems running nodetool repair -inc -par -pr on my 2.1.1
cluster due to "Did not get positive replies from all endpoints" error.
Here's an example output:
root@db08-3:~# nodetool repair -par -inc -pr
[2014-10-30 10:33:02,396] Nothing to repair for keyspace 'system'
[2014-10-30 10:33:
On Wed, Oct 1, 2014 at 3:11 PM, Tyler Hobbs wrote:
> Compressed SSTables store a checksum for every compressed block, which is
> checked each time the block is decompressed. I believe there's a ticket
> out there to add something similar for non-compressed SSTables.
>
> We also store the sha1 ha
Compressed SSTables store a checksum for every compressed block, which is
checked each time the block is decompressed. I believe there's a ticket
out there to add something similar for non-compressed SSTables.
We also store the sha1 hash of SSTables in its own file on disk.
On Wed, Oct 1, 2014 a
If you only run incremental repairs, does that mean that bitrot will go
undetected for already repaired sstables?
If so, is there any other process that will detect bitrot for all the repaired
sstables other than full repair (or an unfortunate user)?
John...
NOTICE: This email message is for
On Thu, Sep 11, 2014 at 9:44 AM, John Sumsion
wrote:
> jbellis talked about incremental repair, which is great, but as I
> understood, repair was also somewhat responsible for detecting and
> repairing bitrot on long-lived sstables.
>
SSTable checksums, and the checksums o
jbellis talked about incremental repair, which is great, but as I understood,
repair was also somewhat responsible for detecting and repairing bitrot on
long-lived sstables.
If repair doesn't do it, what will?
Thanks,
John...
NOTICE: This email message is for the sole use of the int
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