Thank you Jeff for the link.
Please do comment on the G1GC settings,if they are ok for the cluster.
Also comment on reducing the concurrent reads to 32 on all nodes in the
cluster.
As has earlier lead to reads getting dropped.
Will adding nodes to the cluster be helpful.
Thanks,
Rajsekhar Mallick
https://docs.datastax.com/en/developer/java-driver/3.2/manual/paging/
--
Jeff Jirsa
> On Feb 5, 2019, at 11:33 PM, Rajsekhar Mallick
> wrote:
>
> Hello Jeff,
>
> Thanks for the reply.
> We do have GC logs enabled.
> We do observe gc pauses upto 2 seconds but quite often we see this issue
Hello Jeff,
Thanks for the reply.
We do have GC logs enabled.
We do observe gc pauses upto 2 seconds but quite often we see this issue
even when the gc log reads good and clear.
JVM Flags related to G1GC:
Xms: 48G
Xmx:48G
Maxgcpausemillis=200
Parallels gc threads=32
Concurrent gc threads= 10
Ini
What you're potentially seeing is the GC impact of reading a large
partition - do you have GC logs or StatusLogger output indicating you're
pausing? What are you actual JVM flags you're using?
Given your heap size, the easiest mitigation may be significantly
increasing your key cache size (up to a
Hello Team,
Cluster Details:
1. Number of Nodes in cluster : 7
2. Number of CPU cores: 48
3. Swap is enabled on all nodes
4. Memory available on all nodes : 120GB
5. Disk space available : 745GB
6. Cassandra version: 2.1
7. Active tables are using size-tiered compaction strategy
8. Read Throughpu
The table and secondary indexes look generally like this. Note that I have
changed the names of many of the columns to be generic since they aren't
important to the question as far as I know. I left the actual names for
those columns that I've created SASI indexes for. The query I use to try to
cre
Hello,
at a particular customer location, we are seeing the following NPE during
startup with Cassandra 2.1.18.
INFO [SSTableBatchOpen:2] 2019-02-03 13:32:56,131 SSTableReader.java:475 -
Opening
/var/opt/data/cassandra/system/schema_keyspaces-b0f2235744583cdb9631c43e59ce3676/system-schema_key
We (The Last Pickle) wrote a blog post on scaling time series:
http://thelastpickle.com/blog/2017/08/02/time-series-data-modeling-massive-scale.html
Rather than an agent_type, you can use a application determined bucket, so
that agents with more data use more buckets. That'll keep your partition
even if i try to create a agent_type it will be same issue again because
agent_id and agent_type have same values...
On Tue, Feb 5, 2019 at 11:36 AM Bobbie Haynes wrote:
> unfortunately i do not have different of agents(agent_type) .. i only have
> agent_id which is also a UUID type.
>
> On Tue,
unfortunately i do not have different of agents(agent_type) .. i only have
agent_id which is also a UUID type.
On Tue, Feb 5, 2019 at 11:34 AM Nitan Kainth wrote:
> You could consider a sudo column like agent_type and make it a compound
> partition key. It will limit break your partition into sm
You could consider a sudo column like agent_type and make it a compound
partition key. It will limit break your partition into smaller ones but you
will have to query with agent_id and agent_type in that case.
On Tue, Feb 5, 2019 at 12:59 PM Bobbie Haynes wrote:
> Hi Everyone,
>
Hi Everyone,
Could you please help me in modeling my table
below.I'm stuck here. My Partition key is agent_id and clustering column is
rowid. Each agent can have a minimum of 1000 rows to 10M depends on how
busy the agent .I'm facing large partition issue for my busy agents.
I
*Hello my fellow Cassandra people!I’m not sure if you’ve heard, but
DataStax is hosting a conference this year, DataStax Accelerate. I’m in
charge of the speaker part of the conference, so I’m here to ask for some
help. I want a ton of awesome Cassandra content! The best part of our
community is wh
This will depend on what driver you're using at the client. The Java
driver, for example, has ways to configure each of the things you
mentioned, with a variety of implementations you can choose from. There
are also ways to provide your own custom implementation if you don't like
the options avai
All below AFAIK
a) The query will only be retried after half the timeout has passed, if the
query is idempotent (you have to set that on prepare statement, otherwise
it will assume it isn't)
b) Querytimeout can be set globally in the
Cluster.Builder().WithQueryTimeout
c) The LoadBalancingPolicy sh
Sorry to bother you, i am just starting to look into Cassandra, and am confused
about a lot of things.
If a client sends a query to a coordinator, then if it does not receive a
response from the co-ordinator then:
a) is there a timeout at which client retries the query?b) is there somewhere
we c
The 3.0 branch is slightly different than the 3.11 branch
For you, going to 3.0.18 would be a minor version upgrade while going to 3.11.4
would be a major version upgrade
3.11 would give you access to features like CDC, SASI and performance
improvements like better large partition support and t
Hi,
we have a cluster with cassandra 3.0.9 and we are going to upgrade it to
the latest version which i think is 3.11.3 but a teamate told me that the
latest version is 3.0.17.
what is the latest stable version?
thanks in advance.
Could you post full table schema (names obfuscated, if required) with index
creation statements and queries?
On Mon, Feb 4, 2019 at 10:04 AM Jacques-Henri Berthemet <
jacques-henri.berthe...@genesys.com> wrote:
> I’m not sure why it`s not allowed by the Datastax driver, but maybe you
> could try
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