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Shards and replicas in Elasticsearch

I am trying to understand what shard and replica is in Elasticsearch, but I didn't manage to understand it. If I download Elasticsearch and run the script, then from what I know I have started a cluster with a single node. Now this node (my PC) have 5 shards (?) and some replicas (?). ...
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Java Date vs Calendar

Could someone please advise the current "best practice" around Date and Calendar types. 13 Answers ...
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Why would a JavaScript variable start with a dollar sign? [duplicate]

... dom object itself I find this to be very helpful in writing jQuery code and makes it easy to see jQuery objects which have a different set of properties. share | improve this answer | ...
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Difference between acceptance test and functional test?

What is the real difference between acceptance tests and functional tests? 11 Answers ...
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How to build for armv6 and armv7 architectures with iOS 5

In iOS5 Apple drops the armv6 architecture from the ARCHS_STANDARD_32_BIT . 6 Answers ...
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How to implement the activity stream in a social network

I'm developing my own social network, and I haven't found on the web examples of implementation the stream of users' actions... For example, how to filter actions for each users? How to store the action events? Which data model and object model can I use for the actions stream and for the actions it...
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Chrome's remote debugging (USB debugging) not working for Samsung Galaxy S3 running android 4.3

Ever since I upgraded my Samsung Galaxy S3 to android 4.3 (from 4.1.2) I am unable to use Chrome's remote debugging for android (more details here ). ...
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HTML: Include, or exclude, optional closing tags?

...unless I have a very good reason not to) because it lends to more readable and updateable code. share | improve this answer | follow | ...
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Difference between Hashing a Password and Encrypting it

... (well, a mapping). It's irreversible, you apply the secure hash algorithm and you cannot get the original string back. The most you can do is to generate what's called "a collision", that is, finding a different string that provides the same hash. Cryptographically secure hash algorithms are design...
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TransformXml task could not be loaded from Microsoft.Web.Publishing.Tasks.dll

Has anyone seen this error and know how to fix it? 10 Answers 10 ...