svn commit: r1848086 [1/2] - in /cassandra/site/src: ./ _posts/ img/blog-post-introducing-transient-replication/

zznate Mon, 03 Dec 2018 10:16:08 -0800

Author: zznate
Date: Mon Dec  3 18:15:24 2018
New Revision: 1848086

URL: http://svn.apache.org/viewvc?rev=1848086&view=rev
Log:
CASSANDRA-14851 - Blog post for transient replication by Ariel Weisberg


Added:
    
cassandra/site/src/_posts/2018-12-03-introducing-transient-replication.markdown
    cassandra/site/src/img/blog-post-introducing-transient-replication/
    
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring-with-transient-replica.gif
    
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring.gif
    
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-rapid-write-protection.gif
    
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-regular-write.gif
    
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-transient-write-down-node.gif
    
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-transient-write.gif
Modified:
    cassandra/site/src/README

Modified: cassandra/site/src/README
URL: 
http://svn.apache.org/viewvc/cassandra/site/src/README?rev=1848086&r1=1848085&r2=1848086&view=diff
==============================================================================
--- cassandra/site/src/README (original)
+++ cassandra/site/src/README Mon Dec  3 18:15:24 2018
@@ -8,12 +8,15 @@ The site depends on Jekyll (https://jeky
 
 Please use Jekyll 3.4.x for compiling the html pages, so we get identical 
results for everyone.
 
+You may need to add the ruby executable that ends up being installed to your 
firewall on MacOS otherwise
+the web server started by 'make serve' will be unreachable.
+
 Installing Jekyll independently from the version shipped with your OS can be 
done as follows:
 
 # Use rbenv to use a specific Ruby version with Jekyll:
 # See: https://github.com/rbenv/rbenv/#installation
-git clone -b v1.1.1 https://github.com/rbenv/rbenv.git ~/.rbenv
-echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.zshrc # change to bashrc if 
needed
+rbenv local 2.4.2git clone -b v1.1.1 https://github.com/rbenv/rbenv.git 
~/.rbenv
+echo 'export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/shims:$PATH"' >> ~/.zshrc # 
change to bashrc if needed
 # Install ruby-build plugin
 mkdir ~/.rbenv/plugins
 git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
@@ -23,7 +26,7 @@ git clone https://github.com/rbenv/ruby-
 rbenv install 2.4.2
 
 # Associate with Cassandra svn directory
-cd ~/svn/cassandra-site # change as needed
+cd ~/svn/cassandra-site/src # change as needed
 rbenv local 2.4.2
 which rbenv # should point to shim
 ruby --version
@@ -131,4 +134,4 @@ convention, and annotate your post using
 Jekyll).
 
 Follow the instructions above during development -- `make serve` for local 
development, and `make` to generate the final
-product.
\ No newline at end of file
+product.

Added: 
cassandra/site/src/_posts/2018-12-03-introducing-transient-replication.markdown
URL: 
http://svn.apache.org/viewvc/cassandra/site/src/_posts/2018-12-03-introducing-transient-replication.markdown?rev=1848086&view=auto
==============================================================================
--- 
cassandra/site/src/_posts/2018-12-03-introducing-transient-replication.markdown 
(added)
+++ 
cassandra/site/src/_posts/2018-12-03-introducing-transient-replication.markdown 
Mon Dec  3 18:15:24 2018
@@ -0,0 +1,135 @@
+---
+layout: post
+title: "Introducing Transient Replication"
+date:   2018-12-03 01:00:00 -0700
+author: The Apache Cassandra Community
+categories: blog
+---
+
+Transient Replication is a new experimental feature soon to be available in 
4.0. When enabled, it allows for the creation of keyspaces where replication 
factor can be specified as a number of copies (full replicas) and temporary 
copies (transient replicas). Transient replicas retain the data they replicate 
only long enough for it to be propagated to full replicas, via incremental 
repair, at which point the data is deleted. Writing to transient replicas can 
be avoided almost entirely if monotonic reads are not required because it is 
possible to achieve a quorum of acknowledged writes without them.
+
+This results in a savings in disk space, CPU, and IO. By deleting data as soon 
as it is no longer needed, transient replicas require only a fraction of the 
disk space of a full replica. By not having to store the data indefinitely, the 
CPU and IO required for compaction is reduced, and read queries are faster as 
they have less data to process. 
+
+ So what are the benefits of not actually keeping a full copy of the data? 
Well, for some installations and use cases, transient replicas can be almost 
free if [monotonic 
reads](https://en.wikipedia.org/wiki/Consistency_model#Monotonic_Read_Consistency)
 are disabled. In future releases where monotonic reads are supported with 
Transient Replication, enabling monotonic reads would reduce the savings in CPU 
and IO, but even then they should still be significant.
+
+Transient Replication is designed to be transparent to applications:
+
+* Consistency levels continue to produce the same results for queries.
+*  The number of replicas that can be lost before data loss occurs is 
unchanged.
+* The number of replicas that can be unavailable before some queries start to 
timeout or return unavailable is unchanged (with the exception of ONE). 
+
+With Transient Replication, you can go from 3 replicas to 5 replicas, two of 
which are transient, without adding any hardware. 
+
+If you are running an active-passive 2 DC setup with 3 replicas in each DC, 
you can make one replica in each DC transient and still have four full copies 
of the data in total. 
+
+## Feature support
+
+Transient Replication is not intended to fully replace Cassandra's existing 
approach to replication. There are features that currently don't work with 
transiently replicated keyspaces and features that are unlikely ever to work 
with them. 
+
+You can have keyspaces with and without Transient Replication enabled in the 
same cluster, so it is possible to use Transient Replication for just the use 
cases that are a good fit for the currently available functionality. 
+
+### Currently unsupported but coming:
+
+* Monotonic reads
+* Batch log
+* LWT
+* Counters
+
+### Will never be supported:
+
+* Secondary indexes
+* Materialized views
+
+## How Transient Replication works
+
+### Overview
+
+Transient replication extends Cassandra's existing consistent hashing 
algorithm to designate some replicas of a point or range on the consistent hash 
ring as transient and some as full. The following image depicts a consistent 
hash ring with three replicas **A**, **B**, and **C**. The replicas are located 
at tokens 5, 10, 15 respectively. A key ***k*** hashes to token 3 on the ring.
+
+![A consistent hash ring without Transient 
Replication](/img/blog-post-introducing-transient-replication/diagram-hash-ring.gif
 "A consistent hash ring without Rransient Replication")
+
+Replicas are selected by walking the ring clockwise starting at the point on 
the ring the key hashes to. At RF=3, the replicas of key ***k ***are **A**, 
**B**, **C**.
+With Transient Replication, the last N replicas (where N is the configured 
number of transient replicas) found while walking the ring are designated as 
transient. 
+
+There are no nodes designated as transient replicas or full replicas. All 
nodes will fully replicate some ranges on the ring and transiently replicate 
others. 
+
+The following image depicts a consistent hash ring at RF=3/1 (three replicas, 
one of which is transient). The replicas of ***k*** are still **A**, **B**, and 
**C**, but **C** is now transiently replicating ***k***.
+
+![A consistent hash ring with Transient 
Replication](/img/blog-post-introducing-transient-replication/diagram-hash-ring-with-transient-replica.gif
 "A consistent hash ring with Transient Replication")
+
+Normally all replicas of a range receive all writes for that range, as 
depicted in the following image.
+
+![Normal write 
behavior](/img/blog-post-introducing-transient-replication/diagram-regular-write.gif
 "Normal write behavior")
+
+Transient replicas do not receive writes in the normal write path.
+
+![Transient write 
behavior](/img/blog-post-introducing-transient-replication/diagram-transient-write.gif
 "Transient write behavior")
+
+If sufficient full replicas are unavailable, transient replicas will receive 
writes.
+
+![Transient write with unavailable 
node](/img/blog-post-introducing-transient-replication/diagram-transient-write-down-node.gif
 "Transient write with unavailable node")
+
+This optimization, which is possible with Transient Replication, is called 
Cheap Quorums. This minimizes the amount of work that transient replicas have 
to do at write time, and reduces the amount of background compaction they will 
have to do. 
+
+**Cheap Quorums and monotonic reads:** Cheap Quorums may end up being 
incompatible with an initial implementation of monotonic reads, and operators 
will be able to make a conscious trade off between performance and monotonic 
reads.
+
+### Rapid write protection
+
+In keyspaces utilizing Transient Replication, writes are sent to every full 
replica and enough transient replicas to meet the requested consistency level 
(to make up for unavailable full replicas). In addition, enough transient 
replicas are selected to reach a quorum in every datacenter, though unless the 
consistency level requires it, the write will be acknowledged without ensuring 
all have been delivered.
+
+Because not all replicas are sent the write, it's possible that insufficient 
replicas will respond, causing timeouts.  To prevent this, we implement rapid 
write protection, similar to rapid read protection, that sends writes to 
additional replicas if sufficient acknowledgements to meet the consistency 
level are not received promptly.
+
+The following animation shows rapid write protection in action.
+
+![Animation of rapid write protection preventing a write 
timeout](/img/blog-post-introducing-transient-replication/diagram-rapid-write-protection.gif
 "Rapid write protection preventing a write timeout")
+
+Rapid write protection is configured similarly to rapid read protection using 
the table option `additional_write_policy`. The policy determines how long to 
wait for acknowledgements before sending additional mutations. The default is 
to wait for P99 of the observed latency.
+
+### Incremental repair
+
+Incremental repair is used to clean up transient data at transient replicas 
and propagate it to full replicas.
+
+When incremental repair occurs transient replicas stream out transient data, 
but don't receive any. Anti-compaction is used to separate transient and fully 
replicated data so that only fully replicated data is retained once incremental 
repair completes.
+
+The result of running an incremental repair is that all full replicas for a 
range are synchronized and can be used interchangeably to retrieve the repaired 
data set for a query.
+
+### Read path
+
+Reads must always include at least one full replica and can include as many 
replicas (transient or full) as necessary to achieve the desired consistency 
level. At least one full replica is required in order to provide the data not 
available at transient replicas, but it doesn't matter which full replica is 
picked because incremental repair synchronizes the repaired data set across 
full replicas.
+
+ Reads at transient replicas are faster than reads at full replicas because 
reads at transient replicas are unlikely to return any results if monotonic 
reads are disabled, and they haven't been receiving writes.
+
+## Creating keyspaces with Transient Replication
+
+Transient Replication is supported by SimpleStrategy and 
NetworkTopologyStrategy. When specifying the replication factor, you can 
specify the number of transient replicas in addition to the total number of 
replicas (including transient replicas). The syntax for a replication factor of 
3 replicas total with one of them being transient would be â3/1â.
+
+```
+ALTER KEYSPACE foo WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 
'DC1' : '3/1'};
+ALTER KEYSPACE foo WITH REPLICATION = {'class' : 'SimpleStrategy', 
'replication_factor' : '3/1'};
+```
+
+Monotonic reads are not supported with Transient Replication in 4.0, so any 
existing tables in the keyspace must have monotonic reads disabled by setting 
`read_repair = 'NONE'` 
+
+Once the keyspace has been altered, you will need to run incremental repair 
and then nodetool cleanup to ensure  transient data is cleaned up.
+
+## Operational matters
+
+Transient replication requires rolling incremental repair to be run regularly 
in order to move data from transient replicas to full replicas. By default 
transient replicas will receive 1% of writes for transiently replicated ranges 
due to rapid write protection. If a node is down for an extended period of 
time, its transient replicas will receive additional write load and that data 
should be cleaned up using incremental repair. Running incremental repair 
regularly will ensure that the size of each repair is small.
+
+It's also a good idea to run a small number of vnodes with transient 
replication so that when a node goes down the load is spread out over several 
other nodes that transiently replicate that range. Larges numbers of vnodes are 
known to be problematic, so it's best to start with a cluster that is already 
close to or at its maximum size so that a small number of vnodes will be 
sufficient. If you intend to grow the cluster in the future, you will need to 
be cognizant of how this will interact with the number of vnodes you select.
+
+While the odds of any data loss should multiple nodes be permanently lost 
remain the same with transient replication, the magnitude of potential data 
loss does not. With 3/1 transient replication the permanent loss of two nodes 
could result in the loss of the entirety of the repaired data set. If you are 
running a multi-DC setup with a high level of replication such as 2 DCs, with 
3/1 replicas in each, then you will have 4 full copies total and the added risk 
of transient replication is minimal. 
+
+## Experimental features
+
+Experimental features are a relatively new idea for Apache Cassandra. Although 
we recently voted to make materialized views an experimental feature 
retroactively, Transient Replication is the first experimental feature to be 
introduced as such.
+
+The goal of introducing experimental features is to allow for incremental 
development across multiple releases. In the case of Transient Replication, we 
can avoid a giant code drop that heavily modifies the code base, and the 
associated risks with incorporating a new feature that way.
+
+What it means for a feature to be experimental doesn't have a set definition, 
but for Transient Replication it's intended to set expectations. As of 4.0, 
Transient Replication's intended audience is expert operators of Cassandra with 
the ability to write the book on how to safely deploy Transient Replication, 
debug any issues that result, and if necessary contribute code back to address 
problems as they are discovered.
+
+It's expected that the feature set for Transient Replication will not change 
in minor updates to 4.0, but eventually it should be ready for use by a wider 
audience.
+
+## Next steps for Transient Replication
+
+If increasing availability or saving on capacity sounds good to you, then you 
can help make transient replication production-ready by testing it out or even 
deploying it. Experience and feedback from the community is one the of the 
things that will drive transient replication bug fixing and development.

Added: 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring-with-transient-replica.gif
URL: 
http://svn.apache.org/viewvc/cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring-with-transient-replica.gif?rev=1848086&view=auto
==============================================================================
--- 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring-with-transient-replica.gif
 (added)
+++ 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring-with-transient-replica.gif
 Mon Dec  3 18:15:24 2018
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Added: 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring.gif
URL: 
http://svn.apache.org/viewvc/cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring.gif?rev=1848086&view=auto
==============================================================================
--- 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring.gif
 (added)
+++ 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-hash-ring.gif
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Added: 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-rapid-write-protection.gif
URL: 
http://svn.apache.org/viewvc/cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-rapid-write-protection.gif?rev=1848086&view=auto
==============================================================================
--- 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-rapid-write-protection.gif
 (added)
+++ 
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 Mon Dec  3 18:15:24 2018
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Added: 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-regular-write.gif
URL: 
http://svn.apache.org/viewvc/cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-regular-write.gif?rev=1848086&view=auto
==============================================================================
--- 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-regular-write.gif
 (added)
+++ 
cassandra/site/src/img/blog-post-introducing-transient-replication/diagram-regular-write.gif
 Mon Dec  3 18:15:24 2018
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