Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Cassandra High Availability
  • Table Of Contents Toc
Cassandra High Availability

Cassandra High Availability

By : Strickland
4.6 (14)
Buy this Book
close
close
Cassandra High Availability

Cassandra High Availability

4.6 (14)
By: Strickland
Buy this Book

Overview of this book

If you are a developer or DevOps engineer who understands the basics of Cassandra and are ready to take your knowledge to the next level, then this book is for you. An understanding of the essentials of Cassandra is needed.
Table of Contents (11 chapters)
close
close
close
Preface
Icon
Preface
Icon
What this book covers
Icon
What you need for this book
Icon
Who this book is for
Icon
Conventions
Icon
Reader feedback
Icon
Customer support
Lock Free Chapter
1
1. Cassandra's Approach to High Availability
Icon
1. Cassandra's Approach to High Availability
Icon
ACID
Icon
The monolithic architecture
Icon
The master-slave architecture
Icon
Cassandra's solution
Icon
Cassandra's architecture
Icon
Summary
2
2. Data Distribution
Icon
2. Data Distribution
Icon
Hash table fundamentals
Icon
Consistent hashing
Icon
Token assignment
Icon
Partitioners
Icon
Summary
3
3. Replication
Icon
3. Replication
Icon
The replication factor
Icon
Snitches
Icon
Consistency conflicts
Icon
Balancing the replication factor with consistency
Icon
Summary
4
4. Data Centers
Icon
4. Data Centers
Icon
Use cases for multiple data centers
Icon
Data center setup
Icon
Replication across data centers
Icon
Summary
5
5. Scaling Out
Icon
5. Scaling Out
Icon
Choosing the right hardware configuration
Icon
Scaling out versus scaling up
Icon
Growing your cluster
Icon
How to scale out
Icon
How to scale up
Icon
Removing nodes
Icon
Other data migration scenarios
Icon
Snitch changes
Icon
Summary
6
6. High Availability Features in the Native Java Client
Icon
6. High Availability Features in the Native Java Client
Icon
Thrift versus the native protocol
Icon
Setting up the environment
Icon
Connecting to the cluster
Icon
Executing statements
Icon
Handling asynchronous requests
Icon
Load balancing
Icon
Failing over to a remote data center
Icon
Tying it all together
Icon
Summary
7
7. Modeling for High Availability
Icon
7. Modeling for High Availability
Icon
How Cassandra stores data
Icon
Understanding compaction
Icon
CQL under the hood
Icon
Understanding queries
Icon
How collections are stored
Icon
Working with time-series data
Icon
Designing for immutability
Icon
Working with geospatial data
Icon
Summary
8
8. Antipatterns
chevron up
Icon
8. Antipatterns
Icon
Multikey queries
Icon
Secondary indices
Icon
Distributed joins
Icon
Deleting data
Icon
Unbounded row growth
Icon
Summary
9
9. Failing Gracefully
Icon
9. Failing Gracefully
Icon
Knowledge is power
Icon
Logging
Icon
Monitoring node metrics
Icon
When a node goes down
Icon
Backing up data
Icon
Summary
10
Index
Icon
Index

Deleting data

We have established that Cassandra employs a log-structured storage engine, where all writes are immutable appends to the log. The implication is that data cannot actually be deleted at the time a DELETE statement is issued. Cassandra solves this by writing a marker, called a tombstone, with a timestamp greater than the previous value. This has the effect of overwriting the previous value with an empty one, which will then be compiled in subsequent queries for that column in the same manner as any other update. The actual value of the tombstone is set to the time of deletion, which is used to determine when the tombstone can be removed.

Garbage collection

Eventually these tombstones are reconciled with earlier values as part of the compaction process, where the earlier values are discarded. Refer to Chapter 7, Modeling for High Availability, for more details on how compaction works. There are two possibilities for when data can be physically deleted and tombstones collected.

If...

CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
Cassandra High Availability
End of Section 8
Next Section
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon