in configuration and node spec
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On Mon, 05 Oct 2020 09:14:17 +0330 Erick Ramirez
wrote
Sorry for the late reply. Do you still need assistance with this issue?
If the source of the dropped mutations and high latency are the newer nodes
Sorry for the late reply. Do you still need assistance with this issue?
If the source of the dropped mutations and high latency are the newer
nodes, that indicates to me that you have an issue with the commitlog
disks. Are the newer nodes identical in hardware configuration to the
pre-existing
Hi,
I've extended a cluster by 10% and after that each hour, on some of the nodes
(which changes randomly each time), "dropped mutations cross node" appears on
logs (each time 1 or 2 drops and some times some thousands with cross node
latency from 3000ms to 9ms or 90seconds!)
What does Read and _Trace dropped mutations mean? There is no tracing
enabled on any node in the cluster, what are these _TRACE dropped messages?
INFO [ScheduledTasks:1] 2019-07-25 21:17:13,878
MessagingService.java:1281 - READ messages were dropped in last 5000 ms: 1
internal and 0 cross node
sounds like either really bad disks or really bad JVM GC
> pauses.
>
>
> On Thu, Jul 25, 2019 at 8:45 AM Ayub M wrote:
>
>> Hello, how do I read dropped mutations error messages - whats internal
>> and cross node? For mutations it fails on cross-node and read_repair/re
or really bad JVM GC
> pauses.
>
>
> On Thu, Jul 25, 2019 at 8:45 AM Ayub M wrote:
>
>> Hello, how do I read dropped mutations error messages - whats internal
>> and cross node? For mutations it fails on cross-node and read_repair/read
>> it fails on internal. Wha
like either really bad disks or really bad JVM GC
pauses.
On Thu, Jul 25, 2019 at 8:45 AM Ayub M wrote:
> Hello, how do I read dropped mutations error messages - whats internal and
> cross node? For mutations it fails on cross-node and read_repair/read it
> fails on internal. What doe
Hello, how do I read dropped mutations error messages - whats internal and
cross node? For mutations it fails on cross-node and read_repair/read it
fails on internal. What does it mean?
INFO [ScheduledTasks:1] 2019-07-21 11:44:46,150
MessagingService.java:1281 - MUTATION messages were dropped
Dropped mutations are load shedding - somethings not happy.
Are you seeing GC pauses?
What heap size and version?
What memtable settings ?
--
Jeff Jirsa
> On Jul 2, 2018, at 12:48 AM, Hannu Kröger wrote:
>
> Yes, there are timeouts sometimes but more on the read side
, June 26, 2018 9:49 AM
> To: user
> Subject: Problem with dropped mutations
>
> Hello,
>
> We have a cluster with somewhat heavy load and we are seeing dropped
> mutations (variable amount and not all nodes have those).
>
> Are there some clear trigger which cause those? W
) +
storage (dstat tool) isn't reporting too slow disks.
Cheers/Asad
-Original Message-
From: Hannu Kröger [mailto:hkro...@gmail.com]
Sent: Tuesday, June 26, 2018 9:49 AM
To: user
Subject: Problem with dropped mutations
Hello,
We have a cluster with somewhat heavy load and we are seeing
Hannu,
Dropped mutations are often a sign of load-shedding due to an overloaded
node or cluster. Are you seeing resource saturation like high CPU usage
(because the write path is usually CPU-bound) on any of the nodes in your
cluster?
Some potential contributing factors that might be causing you
Hello,
We have a cluster with somewhat heavy load and we are seeing dropped mutations
(variable amount and not all nodes have those).
Are there some clear trigger which cause those? What would be the best
pragmatic approach to start debugging those? We have already added more memory
which
dly. I'm not sure if
>> it's because there was a lot of inconsistency in the data, but I decided to
>> increase the heap to 16 GB and new gen to 6 GB. I increased the max tenure
>> from 1 to 5.
>>
>> I tested on a canary node and everything was fine but when I changed the
&g
if it's
> because there was a lot of inconsistency in the data, but I decided to
> increase the heap to 16 GB and new gen to 6 GB. I increased the max tenure
> from 1 to 5.
>
> I tested on a canary node and everything was fine but when I changed the
> entire DC, I suddenly saw a lot of d
there was a lot of inconsistency in the data, but I decided to
increase the heap to 16 GB and new gen to 6 GB. I increased the max tenure
from 1 to 5.
I tested on a canary node and everything was fine but when I changed the
entire DC, I suddenly saw a lot of dropped mutations in the logs on most
Dropped mutations aren't data loss. Data loss implies the data was already
there and is now gone, whereas for a dropped mutation the data was never
there in the first place. A dropped mutation just results in a
inconsistency, or potentially no data if all mutations are dropped, and C*
will tell
Hello
Could the following be interpreted as, 'Dropped Mutations', in some cases
mean data loss?
http://cassandra.apache.org/doc/latest/faq/index.html#why-message-dropped
For writes, this means that the mutation was not applied to all replicas it
was sent to. The inconsistency will be repaired
Hey,
We've seen a considerable increase in the number of dropped mutations after
a major upgrade from 1.2.18 to 2.0.10. I initially thought it was due to
the extra load incurred by upgradesstables, but the dropped mutations
continue even after all sstables are upgraded.
Additional info: Overall
Hi Paulo,
On 10/11/14 15:18, Paulo Ricardo Motta Gomes wrote:
Hey,
We've seen a considerable increase in the number of dropped mutations after a
major upgrade from 1.2.18 to 2.0.10. I initially thought it was due to the extra
load incurred by upgradesstables, but the dropped mutations continue
On Mon, Nov 10, 2014 at 12:46 PM, Duncan Sands duncan.sa...@gmail.com
wrote:
Hi Paulo,
On 10/11/14 15:18, Paulo Ricardo Motta Gomes wrote:
Hey,
We've seen a considerable increase in the number of dropped mutations
after a
major upgrade from 1.2.18 to 2.0.10. I initially thought
Hey all,
Our setup is 5 machines running Cassandra 0.7.0 with 24GB of heap and 1.5TB
disk each collocated in a DC. We're doing bulk imports from each of the nodes
with RF = 2 and write consistency ANY (write perf is very important). The
behavior we're seeing is this:
- Nodes often
1. Why 24GB of heap? Do you need this high heap? Bigger heap can lead to
longer GC cycles but 15min look too long.
2. Do you have ROW cache enabled?
3. How many column families do you have?
4. Enable GC logs and monitor what GC is doing to get idea of why it is
taking so long. You can add
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