logo
down
shadow

Handling quorum writies fail on Cassandra


Handling quorum writies fail on Cassandra

Content Index :

Handling quorum writies fail on Cassandra
Tag : development , By : jay
Date : November 24 2020, 05:47 AM


Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Data in Cassandra not consistent even with Quorum configuration


Tag : cassandra , By : mobi phil
Date : March 29 2020, 07:55 AM
this one helps. After check the source code with the system log, I found the root cause of the inconsistency. Three factors cause the problem:
Create and update same record from different nodes Local system time is not synchronized accurately enough (although we use NTP) Consistency level is QUORUM
 seqID   NodeA         NodeB          NodeC
 1.      New(.050)     New(.050)      New(.050)
 2.      Delete(.030)  Delete(.030)

When would Cassandra not provide C, A, and P with W/R set to QUORUM?


Tag : cassandra , By : user170635
Date : March 29 2020, 07:55 AM
help you fix your problem With a quorum, you are unavailable (i.e. won't accept reads or writes) if there aren't enough replicas available. You can choose to relax and read / write on lower consistency levels granting you availability, but then you won't be consistent.
There's also the case where a quorum on reads and writes guarantees you the latest "written" data is retrieved. However, if a coordinator doesn't know about required partitions being down (i.e. gossip hasn't propagated after 2 of 3 nodes fail), it will issue a write to 3 replicas [assuming quorum consistency on a replication factor of 3.] The one live node will write, and the other 2 won't (they're down). The write times out (it doesn't fail). A write timeout where even one node has writte IS NOT a write failure. It's a write "in progress". Let's say the down nodes come up now. If a client next requests that data with quorum consistency, one of two things happen:

Can't understand the QUORUM of the below cassandra cluster


Tag : cassandra , By : dantino
Date : March 29 2020, 07:55 AM
wish of those help You are correct, it is 7, the documentation is incorrect here. I am opening a ticket to get it corrected.

Cassandra - Cannot achieve consistency level QUORUM


Tag : cassandra , By : Salikh
Date : March 29 2020, 07:55 AM
Hope this helps I managed to solve the problem.
I had to run ALTER KEYSPACE system_auth WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 }; as it was set to {'class': 'NetworkTopologyStrategy', 'DC1': '1', 'DC2': '1'} previously, even though it was a single node cluster.

Cassandra Authentication Fail: "Unable to perform authentication: Cannot achieve consistency level QUORUM"


Tag : cassandra , By : Milander
Date : September 20 2020, 07:00 AM
wish helps you My guess is that you need to run repair on all of the nodes for the "system_auth", and if you're running DSE, ensure any keyspace that starts with "dse" that has "simple strategy" is updated to Network Topology Strategy with appropriate DC and RF settings - and run repair on each node for those as well.
That should solve your problem. My guess is that you created your users and then updated the keyspaces to use Network Topology. Once done, any new records will be be propagated correctly, but the existing records need repair to "fan them out" as it won't happen on its own.
Related Posts Related QUESTIONS :
  • What's the Developer Express equivalent of System.Windows.Forms.LinkButton?
  • Is it acceptable for invalid XHTML?
  • Anyone soloing using fogbugz?
  • Using MBUnit in TeamCity
  • How to setup a crontab to execute at specific time
  • Linking two Office documents
  • How can I detect if a browser is blocking a popup?
  • Apply filter to t-foreach
  • Lotus Notes convert formula to agent
  • Problem with configuration of odoo for working with pycharm
  • Unexpected number of arguments when calling EM_JS function
  • What does the function state_fidelity() do in Qiskit?
  • Azure function with IoT Hub trigger get send device
  • Cluster similar words using word2vec
  • Add elements into an array then find distinct,
  • Angular8 - error TS2304: Cannot find name
  • Manually polling streams in future implementation
  • How do you perform receipt validation for Android on Xamarin Forms
  • What is the rule behind instruction count in Intel PIN?
  • How to draw some text when click a button in wxWidgets?
  • Restrict entity types in Spacy NER
  • How to animate CN1 Slider progress on load
  • Issue with bwa mem process not running on all output files from previous process
  • Delete videos from playlist using YouTube API
  • How to restart the Hyperledger Composer Playground locally
  • How to configure email alerts in Zabbix Server?
  • Simulator is not working for smart home action with all configured session
  • How parse data using join on Objection.js
  • Assign an array to a property in a Chapel Class
  • Netlogo: How can I obtain the accumulate value in Netlogo?
  • How to populate datasource for listview using api response in react native?
  • Why does gmail API when using history.list method send message ids without the field what action has been preformed on t
  • How to run an append query in ms access vba as part of a transaction
  • Wrong dates shown in Jekyll-based blog
  • How to concatenate two document lists in a webMethods flow service?
  • How to properly set up a site map addition in a customization project
  • IBM Content Collector error calling external Web Service
  • Is (0*1*)* equal to (0 | 1)*?
  • How do I configure phpMyAdmin to start with a blank sql query from the SQL tab?
  • "Objects are not valid as a React child" Redux error when conditionally connecting a component?
  • Displacy results are not showing
  • Strapi / Graphql. What am i doing wrong?
  • How to add Search bar for django template?
  • lookup in presto using single column against a range in lookup table
  • How can you stop videos being stolen on website?
  • Can't code substitution happen in Hybrid Flow?
  • Removed widget remains on parent
  • setup saga middleware with redux-starter-kit's configureStore()
  • How to get cookies from response of scrapy splash
  • I need to do a firebase stream and not a Http Get
  • Unable to compile node-runtime
  • SQLSTATE[42S22]: Column not found: 1054 Unknown column '' in 'where clause'
  • How to extract only the number from a variable
  • disable linter in DAML studio
  • RxJS: How to set exhaustMap concurrent?
  • How to remove perforce (p4) on Ubuntu
  • How do they know mean and std, the input value of transforms.Normalize
  • Why this type is not an Interface?
  • SugarCRM Rest API set_relationship between Contacts and Documents
  • Jira dashboard organization
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com