December 3: Achieving Resiliency: Building in High Availability and Disaster Recovery - InformationWeek

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December 3: Achieving Resiliency: Building in High Availability and Disaster Recovery
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thanks guys! Another great chat! 

Apprentice

Thanks everyone -- see you tomorrow!

Apprentice

Flexible replication can be done across heterogeneous platforms.

Apprentice

To make matters murkier in my Seattle/Iceland example, I believe they are running on different versions of vSphere... would that be a problem for them? 

Apprentice

Very true. The thinking is still about data modeling and ETL. NoSQL is designed to ingest as-is and get quick value.

Apprentice

It's so hard to get out of those paradigms once you've been living and breathing them for years. It sounds like a pretty common problem though, from anecdotal evidence I've heard in discussions with CTOs and CIOs

Apprentice

@wendy:  Regarding "biggest mistake".  Mohamed can chime in here as well.  The thing I see most often is trying to apply relational database thinking to NoSQL.  A relational DBA may come in and model documents like they would tables, whereas someone with more NoSQL experience would lean toward data denormalization.

Apprentice

Thanks guys, that helps a lot. 

Apprentice

@wendy:  If I may add, Forest replication is for HA within a cluster. As a general practice cluster nodes remain within the same data center. Replication across different DC is usually done for DR

 

Apprentice

So then in summary:  Failover is within the same cluster to ensure high availability.  Database replication is cluster:cluster for Disaster Recovery purposes

Apprentice

Greg, in your experience, what's the biggest mistake being made by your clients when MarkLogic comes onto the scene (thinking about the Healthcare.gov example earlier in the week, but surely there are other situations less enormous)?

Apprentice

ha, yes, sorry, DC as in data center

Apprentice

Oops -- I see you mean DC as in Data Center not "Washington DC".  Replace DC with Seattle in my last response :)

Apprentice

@wendy:  Regarding replica forests.  Most customers use forest replication to ensure high availability of a cluster.  So the cluster in DC has replica forests on other machines within that cluster.  Then they would use database replication to make sure the cluster in Iceland is up to date.

Apprentice

@wendy:  Just to add a bit more color to your question about flexible replication.  Let's say a new document comes into the master.  When that commit occurs, a trigger would fire which would then replicate that document to X number of replicas.

One of the nice things that flexible replication enables is selective replication.  Maybe you don't want to replicate EVERYTHING, but only docs that match X, Y and Z criteria

Apprentice

With regards to the replica forests, any issue if the replica forests are in another DC... like on another continent? (I'm specifically thinking about a company that has its DC in both Seattle and Iceland) What kind of time lag are you typically seeing for the replicating? 

Apprentice

@nkannedari750:  When journal archiving is turned on, you are keeping a record of all transactions since the last backup, and storing that archive somewhere else.  Should you need it, MarkLogic provides a mechanism to replay the archive up to a specific timestamp

Apprentice

@wendy:  There is some latency with flexible replication -- its asynchronous

Apprentice

Greg on slide 18 (I may have missed this part of the discussion) are there latency issues that you've experienced crossing the undersea FC? 

Apprentice

How jounal archieving retrive the little loss of data happened in 1 hr back?

 

Apprentice

Hello everyone -- hopefully now you can take a few minutes now to glance through the slides that you might have missed.  I'm happy to answer specific questions on a given slide now that you can see them.  Just let me know the question and the slide # that its in reference to and I'll help you out.

Apprentice

Fast fix on the slide deck, guys! Greg has been doing well without it so far so props there too! Way to rally!

Apprentice

The link for the slide deck is now working: Please click on the link above and download the deck to follow along!

Strategist

For those just arriving: We're having some technical difficulties with our slides right now. As soon as the difficulties are fixed, we'll let everyone know with a message here in the class discussion.

Strategist

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, if it doesn't start automatically, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

Apprentice

We'd love to have your voice in the discussion here. To take part, just type your comment or question into the "Your Post" box and then click on the "Post" button below the box. Feel free to introduce yourself before the class starts -- I think you'll find that we're a very friendly community here! 

Strategist

Hey, everyone, we're glad you could join us! When the show is class to start, at 2:00 p.m. EST, an audio player should appear above the "Your Post" window. If it doesn't appear, you might need to refresh your browser until it does. If it appears but doesn't start playing, then you may need to click on the "play" button on the far left of the player. 

Strategist

I will be happy to join.

Apprentice


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