The correct way to restart a node is to shut it down, using either the [shutdown API][1] or sending a `TERM` signal to the process (eg with `kill $PID`).

Once shut down, you can start a new node using whatever you use to run elasticsearch, eg the service wrapper, or just starting it from the command line.

If you are using the service wrapper, you can restart a node by passing it the `restart` command: eg `/etc/init.d/elasticsearch restart` but that is just a convenience wrapper for the above.

The `restart` API has been disabled since version 0.11 as it was problematic.


  [1]: https://web.archive.org/web/20120701041008/http://www.elasticsearch.org/guide/reference/api/admin-cluster-nodes-shutdown.html

Every time a node goes down and/or and new node comes up, the cluster redistributes the shards, which may not be desired when you just need to restart a node, therefore you can make use of Rolling restart:

1. first disable shard allocation: 


       PUT /_cluster/settings
       {
           &quot;transient&quot; : {
               &quot;cluster.routing.allocation.enable&quot; : &quot;none&quot;
           }
        }

2. restart the node `service elasticsearch restart`

3. Enable shard allocation: 


    PUT /_cluster/settings
    {
        &quot;transient&quot; : {
            &quot;cluster.routing.allocation.enable&quot; : &quot;all&quot;
        }
    }


More on this: [Here][1]


  [1]: https://www.elastic.co/guide/en/elasticsearch/guide/current/_rolling_restarts.html



There is a restart API analogous to the [shutdown API][1]. Just replace &quot;shutdown&quot; with &quot;restart&quot;. See also the [issue on github][2].


  [1]: http://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-nodes-shutdown.html
  [2]: https://github.com/elasticsearch/elasticsearch/issues/155

For restarting elasticserch service, first check the status and then restart that would give a clear picture 

    sudo service elasticsearch.service status -l    
    sudo service elasticsearch.service restart


I have a UIViewController I created in my apps storyboard, as well as a custom UIViewController subclass which I added to the project (and is correctly in the compile phase for my target). However when I go to set the &#39;Custom Class&#39; property on the view-controller in Storyboard my custom class does not show up on the list.

 - Checked that the class is part of my app&#39;s target, not tests&#39;
 - Double checked that it is correctly a subclass of UIViewController
 - Compiled program just to make sure xcode was working with latest information
 - Restarted xcode


What would cause my class to not show up in the &#39;Custom Class&#39; drop down?

Storyboard uiviewcontroller, &#39;custom class&#39; not showing in drop down

I&#39;m on Ubuntu 12.10 with OpenSSL 1.0.1c, python 2.7.3, [Requests](http://www.python-requests.org/en/latest/) 1.0.3 and 1.0.4 (tried both), and when attempting to connect to the website in the url variable with the following code.
    
    def SendInitialRequest(xmlmessage, redirecturl):
        url = &#39;https://centineltest.cardinalcommerce.com/maps/txns.asp&#39;
        
        payload = &#39;cmpi_msg=&#39; + ET.tostring(xmlmessage)
        headers = {
            &#39;Content-Type&#39;: &#39;application/x-www-form-urlencoded&#39;,
        }
        r = requests.post(url, data=payload, headers=headers, verify=None)
        print r.text


It throws the following error:

    Traceback (most recent call last):
      File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
      File &quot;clams/libs/centinel/thinclient.py&quot;, line 134, in SendInitialRequest
        r = requests.post(url, data=payload, headers=headers, verify=None)
      File &quot;/home/jasonamyers/.virtualenv/clams/lib/python2.7/site-packages/requests/api.py&quot;, line 87, in post
        return request(&#39;post&#39;, url, data=data, **kwargs)
      File &quot;/home/jasonamyers/.virtualenv/clams/lib/python2.7/site-packages/requests/api.py&quot;, line 44, in request
        return session.request(method=method, url=url, **kwargs)
      File &quot;/home/jasonamyers/.virtualenv/clams/lib/python2.7/site-packages/requests/sessions.py&quot;, line 269, in request
        resp = self.send(prep, stream=stream, timeout=timeout, verify=verify, cert=cert, proxies=proxies)
      File &quot;/home/jasonamyers/.virtualenv/clams/lib/python2.7/site-packages/requests/sessions.py&quot;, line 364, in send
        r = adapter.send(request, **kwargs)
      File &quot;/home/jasonamyers/.virtualenv/clams/lib/python2.7/site-packages/requests/adapters.py&quot;, line 163, in send
        raise SSLError(e)
    requests.exceptions.SSLError: [Errno 8] _ssl.c:504: EOF occurred in violation of protocol

Attempting the connection with openssl returns the following:

    $ openssl s_client -connect centineltest.cardinalcommerce.com:443
    CONNECTED(00000003)
    140019346777760:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177:
    ---
    no peer certificate available
    ---
    No client certificate CA names sent
    ---
    SSL handshake has read 0 bytes and written 226 bytes
    ---
    New, (NONE), Cipher is (NONE)
    Secure Renegotiation IS NOT supported
    Compression: NONE
    Expansion: NONE
    ---

If I force it to use tls1 it works (output truncated):

    $ openssl s_client -tls1 -connect centineltest.cardinalcommerce.com:443
    CONNECTED(00000003)
    depth=2 C = US, O = &quot;thawte, Inc.&quot;, OU = Certification Services Division, OU
    verify error:num=20:unable to get local issuer certificate
    verify return:0
    ---

I&#39;ve seen numerous [bug reports](https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/965371) for this; however, I&#39;ve not found a way to get around it using the python requests library.  Any assistance would be greatly appreciated.

Python Requests requests.exceptions.SSLError: [Errno 8] _ssl.c:504: EOF occurred in violation of protocol

What is the proper way to restart node in elasticsearch? (preferably via the REST API, java API might be ok too)

Restart elasticsearch node

<p>What is the proper way to restart node in elasticsearch? (preferably via the REST API, java API might be ok too)</p>


In eclipse 4.2, I can just type:

    joptionpane

and press **&lt;kbd&gt;CTRL&lt;/kbd&gt;+&lt;kbd&gt;SPACE&lt;/kbd&gt;** and it will turn into:

    JOptionPane

Is there any way to do the same with intelliJ IDEA? I have tried pressing **&lt;kbd&gt;CTRL&lt;/kbd&gt;+&lt;kbd&gt;SPACE&lt;/kbd&gt;**, and **&lt;kbd&gt;ALT&lt;/kbd&gt;+&lt;kbd&gt;/&lt;/kbd&gt;**. But, for some reason it just does not work.

I would be most grateful if anyone could show me how to do this.

I am just trying out version 12 of IDEA, since some of my friends told me that it was a better IDE and had better code completion (their opinions).

IntelliJ IDEA 12 code completion without capitalisation

I am trying to create an application that matches a message template with a message that a user is trying to send. I am using Java regex for matching the message. The template/message may contain special characters.

How would I get the complete list of special characters that need to be escaped in order for my regex to work and match in the maximum possible cases?

Is there a universal solution for escaping all special characters in Java regex?

List of all special characters that need to be escaped in a regex

My code here detects if the `mimeType` is equals to some [MIME][1] type, if it is, it will do a certain conversion

    public void convertToMp3(File src, File target,String mimeType){
        if(mimeType.equals(&quot;audio/mpeg&quot;)){
            ...
        }else if(mimeType.equals(&quot;audio/wav&quot;)){
            mp3ToWav();
        }else if(mimeType.equals(&quot;audio/ogg&quot;)){
            ...
        }else if(...){
        ... //More if and else here
    }

I have shortened my code, because it has a lot of *else if* statements, What design pattern is suitable for removing many *if* and *else* or *else if* statements?

  [1]: http://en.wikipedia.org/wiki/MIME


Converting many &#39;if else&#39; statements to a cleaner approach

Why doesn&#39;t this code throw an `ArithmeticException`? Take a look:


    public class NewClass {
    
        public static void main(String[] args) {
            // TODO code application logic here
            double tab[] = {1.2, 3.4, 0.0, 5.6};
    
            try {
                for (int i = 0; i &lt; tab.length; i++) {
                    tab[i] = 1.0 / tab[i];
                }
            } catch (ArithmeticException ae) {
                System.out.println(&quot;ArithmeticException occured!&quot;);
            }
        }
    }

I have no idea!

Java division by zero doesnt throw an ArithmeticException - why?

In GSON to get a list of objects you do



    Gson gson = new Gson();
    Type token = new TypeToken&lt;List&lt;MyType&gt;&gt;(){}.getType();
    return gson.fromJson(json, token);

			
It works great, but I want to go further and have MyType parametrized so I can have a common function to parse list of objects with this code


    // the common function 
    public &lt;T&gt; List&lt;T&gt; fromJSonList(String json, Class&lt;T&gt; type) {
      Gson gson = new Gson();
      Type collectionType = new TypeToken&lt;List&lt;T&gt;&gt;(){}.getType();
      return gson.fromJson(json, collectionType);
    }
    
    // the call
    List&lt;MyType&gt; myTypes = parser.fromJSonList(jsonString, MyType.class);

Sadly returns an array of StringMaps, not the type. T is being interpreted as another generic type, not my type. Any workaround ?



Java Type Generic as Argument for GSON

I need to check if a string is present in a list, and call a function which accepts a boolean accordingly.

Is it possible to achieve this with a one liner?

The code below is the best I could get:

    val strings = List(&quot;a&quot;, &quot;b&quot;, &quot;c&quot;)
    val myString = &quot;a&quot;
    
    strings.find(x=&gt;x == myString) match {
      case Some(_) =&gt; myFunction(true)
      case None =&gt; myFunction(false)
    }

I&#39;m sure it&#39;s possible to do this with less coding, but I don&#39;t know how!

Scala check if element is present in a list

I&#39;m wondering if there is any ideomatic way to chain multiple InputStreams into one continual InputStream in Java (or Scala).

What I need it for is to parse flat files that I load over the network from an FTP-Server. What I want to do is to take file[1..N], open up streams and then combine them into one stream. So when file1 comes to an end, I want to start reading from file2 and so on, until I reach the end of fileN. 

I need to read these files in a specific order, data comes from a legacy system that produces files in barches so data in one depends on data in another file, but I would like to handle them as one continual stream to simplify my domain logic interface. 

I searched around and found PipedInputStream, but I&#39;m not positive that is what I need. An example would be helpful.

How to chain multiple different InputStreams into one InputStream

I realize that there are several questions on here about ***what*** currying and partially applied functions are, but I&#39;m asking about how they are different. As a simple example, here is a curried function for finding even numbers:

    def filter(xs: List[Int], p: Int =&gt; Boolean): List[Int] =
       if (xs.isEmpty) xs
       else if (p(xs.head)) xs.head :: filter(xs.tail, p)
       else filter(xs.tail, p)

    def modN(n: Int)(x: Int) = ((x % n) == 0)

So you could write the following to use this:

    val nums = List(1,2,3,4,5,6,7,8)
    println(filter(nums, modN(2))

which returns: `List(2,4,6,8)`.  But I&#39;ve found that I can do the same thing this way:

    def modN(n: Int, x: Int) = ((x % n) == 0)

    val p = modN(2, _: Int)
    println(filter(nums, p))

which also returns: `List(2,4,6,8)`. 

So my question is, what&#39;s the main difference between the two, and when would you use one over the other? Is this just too simplistic of an example to show why one would be used over the other?

Scala currying vs partially applied functions

Suppose we want to write a macro that defines an anonymous class with some type members or methods, and then creates an instance of that class that&#39;s statically typed as a structural type with those methods, etc. This is possible with the macro system in 2.10.0, and the type member part is extremely easy:

    object MacroExample extends ReflectionUtils {
      import scala.language.experimental.macros
      import scala.reflect.macros.Context

      def foo(name: String): Any = macro foo_impl
      def foo_impl(c: Context)(name: c.Expr[String]) = {
        import c.universe._
    
        val Literal(Constant(lit: String)) = name.tree
        val anon = newTypeName(c.fresh)
    
        c.Expr(Block(
          ClassDef(
            Modifiers(Flag.FINAL), anon, Nil, Template(
              Nil, emptyValDef, List(
                constructor(c.universe),
                TypeDef(Modifiers(), newTypeName(lit), Nil, TypeTree(typeOf[Int]))
              )
            )
          ),
          Apply(Select(New(Ident(anon)), nme.CONSTRUCTOR), Nil)
        ))
      }
    }

(Where `ReflectionUtils` is a [convenience trait][1] that provides my `constructor` method.)

This macro lets us specify the name of the anonymous class&#39;s type member as a string literal:

    scala&gt; MacroExample.foo(&quot;T&quot;)
    res0: AnyRef{type T = Int} = $1$$1@7da533f6

Note that it&#39;s appropriately typed. We can confirm that everything&#39;s working as expected:

    scala&gt; implicitly[res0.T =:= Int]
    res1: =:=[res0.T,Int] = &lt;function1&gt;

Now suppose that we try to do the same thing with a method:

    def bar(name: String): Any = macro bar_impl
    def bar_impl(c: Context)(name: c.Expr[String]) = {
      import c.universe._

      val Literal(Constant(lit: String)) = name.tree
      val anon = newTypeName(c.fresh)

      c.Expr(Block(
        ClassDef(
          Modifiers(Flag.FINAL), anon, Nil, Template(
            Nil, emptyValDef, List(
              constructor(c.universe),
              DefDef(
                Modifiers(), newTermName(lit), Nil, Nil, TypeTree(),
                c.literal(42).tree
              )
            )
          )
        ),
        Apply(Select(New(Ident(anon)), nme.CONSTRUCTOR), Nil)
      ))
    }

But when we try it out, we don&#39;t get a structural type:

    scala&gt; MacroExample.bar(&quot;test&quot;)
    res1: AnyRef = $1$$1@da12492

But if we stick an extra anonymous class in there:

    def baz(name: String): Any = macro baz_impl
    def baz_impl(c: Context)(name: c.Expr[String]) = {
      import c.universe._

      val Literal(Constant(lit: String)) = name.tree
      val anon = newTypeName(c.fresh)
      val wrapper = newTypeName(c.fresh)

      c.Expr(Block(
        ClassDef(
          Modifiers(), anon, Nil, Template(
            Nil, emptyValDef, List(
              constructor(c.universe),
              DefDef(
                Modifiers(), newTermName(lit), Nil, Nil, TypeTree(),
                c.literal(42).tree
              )
            )
          )
        ),
        ClassDef(
          Modifiers(Flag.FINAL), wrapper, Nil,
          Template(Ident(anon) :: Nil, emptyValDef, constructor(c.universe) :: Nil)
        ),
        Apply(Select(New(Ident(wrapper)), nme.CONSTRUCTOR), Nil)
      ))
    }

It works:

    scala&gt; MacroExample.baz(&quot;test&quot;)
    res0: AnyRef{def test: Int} = $2$$1@6663f834
    
    scala&gt; res0.test
    res1: Int = 42

This is extremely handy—it lets you do things like [this][2], for example—but I don&#39;t understand why it works, and the type member version works, but not `bar`. I know this [may not be defined behavior][3], but does it make any sense? Is there an cleaner way to get a structural type (with the methods on it) from a macro?


  [1]: https://gist.github.com/4552471
  [2]: https://github.com/travisbrown/rillit
  [3]: https://stackoverflow.com/q/13669974/334519

Getting a structural type with an anonymous class&#39;s methods from a macro

I&#39;m only beginning to become familiar with the concept of kinds, so bear with me if I am not formulating my questions well...

**Values have Types:**

    3 :: Int
    [1,2,3] :: [Int]
    (&#39;c&#39;,True) :: (Char,Bool)

**Types have Kinds:**

    the type &#39;Int&#39; has kind *
    the type &#39;[Int]&#39; also has kind *
       but the type constructor [] has kind * -&gt; *
    similarly, the type (Char,Bool) has kind  *
       but the type constructor (,) has kind * -&gt; * -&gt; *

**What do Kinds have?**  

Do they kinds have ilk, or genres, or breeds, or varieties?

How far does this sequence of abstraction go?  Do we stop because we run out of words, or do we stop because going farther has no value?  Or, perhaps, because we quickly reach the limits of human cognition and just can&#39;t wrap our heads around higher-genred kinds?

A related question:  languages give us value-constructors (like a cons operator) to make values. Languages also give us type-constructors like (,) or [] to make types.  Are there any languages that expose kind-constructors to make kinds?  

Another edge case that I&#39;m curious about:  We apparently have a type that has no value, denoted as ⊥, called &quot;the bottom type&quot;.  Is there a kind that has no type:  a bottom kind?


values, types, kinds,... as an infinite sequence?

Is it possible to query for all of the values a specific field? Say I have &quot;articles&quot; and each  article has an author, is there a query I can perform to find a list of all authors? 

Elasticsearch- get all values for a given field?

How can i get all the results from elastic search as the results only display limit to 10 only. ihave got a query like:






    @data = Athlete.search :load =&gt; true do
              size 15
              query do
                boolean do
                  must { string q, {:fields =&gt; [&quot;name&quot;, &quot;other_names&quot;, &quot;nickname&quot;, &quot;short_name&quot;], :phrase_slop =&gt; 5} }
                  unless conditions.blank?
                    conditions.each do |condition|
                      must { eval(condition) }
                    end
                  end
                  unless excludes.blank?
                    excludes.each do |exclude|
                      must_not { eval(exclude) }
                    end
                  end
                end
              end
              sort do
                by &#39;_score&#39;, &quot;desc&quot;
              end
            end

i have set the limit to 15 but i wan&#39;t to make it unlimited so that i can get all the data
I can&#39;t set the limit as my data keeps on changing and i want to get all the data.


Setting Elastic search limit to &quot;unlimited&quot;

I have an application developed using the MVC pattern and I would like to index now multiple models of it, this means each model has a different data structure.

*  Is it better to use mutliple indexes, one for each model or have a type within the same index for each model? Both ways would also require a different search query I think. I just started on this.

* Are there differences performancewise between both concepts if the data set is small or huge?

I would test the 2nd question myself if somebody could recommend me some good sample data for that purpose.

Elastic search, multiple indexes vs one index and types for different data sets?

I configured a custom analyzer and put some documents into the index. Now I want to debug my settings so I can see which n-grams actually made it into the index.

When I used Solr before, there was a possibility to see which strings were saved in the index as keys and also their frequency.

How can I view the contents of an ElasticSearch index?

I can&#39;t see any description of when I should use a query or a filter or some combination of the two. What is the difference between them? Can anyone please explain?

Content Type	Original Author	Original Content on Stackoverflow
Question	user1768906	View Question on Stackoverflow
Solution 1 - Java	DrTech	View Answer on Stackoverflow
Solution 2 - Java	Tiago Lopo	View Answer on Stackoverflow
Solution 3 - Java	Kim Stebel	View Answer on Stackoverflow
Solution 4 - Java	Ashish Dadhich	View Answer on Stackoverflow

Restart elasticsearch node

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

Python Requests requests.exceptions.SSLError: [Errno 8] _ssl.c:504: EOF occurred in violation of protocol

Storyboard uiviewcontroller, 'custom class' not showing in drop down

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