Elasticsearch PHP client throwing exception "No alive nodes found in your cluster"

Question

I am trying to do a scan and scroll operation on an index as shown in the example :

$client = ClientBuilder::create()->setHosts([MYESHOST])->build();
$params = [
    "search_type" => "scan",    // use search_type=scan
    "scroll" => "30s",          // how long between scroll requests. should be small!
    "size" => 50,               // how many results *per shard* you want back
    "index" => "my_index",
    "body" => [
        "query" => [
            "match_all" => []
        ]
    ]
];

$docs = $client->search($params);   // Execute the search
$scroll_id = $docs['_scroll_id'];   // The response will contain no results, just a _scroll_id

// Now we loop until the scroll "cursors" are exhausted
while (\true) {

    // Execute a Scroll request
    $response = $client->scroll([
            "scroll_id" => $scroll_id,  //...using our previously obtained _scroll_id
            "scroll" => "30s"           // and the same timeout window
        ]
    );

    // Check to see if we got any search hits from the scroll
    if (count($response['hits']['hits']) > 0) {
        // If yes, Do Work Here

        // Get new scroll_id
        // Must always refresh your _scroll_id!  It can change sometimes
        $scroll_id = $response['_scroll_id'];
    } else {
        // No results, scroll cursor is empty.  You've exported all the data
        break;
    }
}

The first $client->search($params) API call executes fine and I am able to get back the scroll id. But $client->scroll() API fails and I am getting the exception : "Elasticsearch\Common\Exceptions\NoNodesAvailableException No alive nodes found in your cluster"

I am using Elasticsearch 1.7.1 and PHP 5.6.11

Please help

Solution 1

I found the php driver for elasticsearch is riddled with issues, the solution I had was to just implement the RESTful API with curl via php, Everything worked much quicker and debugging was much easier

Solution 2

Check if your server running with following command.

service elasticsearch status

I had the same problem and solved it.

I have added script.disable_dynamic: true to elasticsearch.yml as explained in Digitalocan tutorial https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-elasticsearch-on-ubuntu-14-04

So elasticsearch server was not started.

I removed following line from elasticsearch.yml

script.disable_dynamic: true

Solution 3

I would guess the example is not up to date with the version you're using (the link you've provided is to 2.0, and you are sauing you use 1.7.1). Just add inside the loop:

try {
      $response = $client->scroll([
            "scroll_id" => $scroll_id,  //...using our previously obtained _scroll_id
            "scroll" => "30s"           // and the same timeout window
        ]
    );
}catch (Elasticsearch\Common\Exceptions\NoNodesAvailableException $e) {
   break;
}

Solution 4

I would recommend on using php curl lib directly for elasticsearch queries. I find it easier to use than any other elasticsearch client lib, you can simulate any query using cli curl and you can find many examples, documentation and discussions in the internet.

Solution 5

Maybe you should try to telnet on your machine telnet [your_es_host] [your_es_ip] to check if you can access to it.

If not please try to open that port or disable your machine's firewall.

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