PHP7 Elasticsearch scroll常见错误

背景：使用PHP7查询Elasticsearch7的数据

错误1：Elasticsearch 7.0.1 - Trying to create too many scroll contexts. Must be less than or equal to: [500]

原因：在search($params)中设置的timeout时间内，累计生成的scroll_id数超过了最大限制

解决方法：查询scroll以后，删除对应的id，即调用clearScroll方法

代码如下：

$response = $this->client->search($params);   // Execute the search
        while (isset($response['hits']['hits']) && count($response['hits']['hits']) > 0) {

            // **
            // 对response内容进行处理
            // **

            // When done, get the new scroll_id
            // You must always refresh your _scroll_id!  It can change sometimes
            $scroll_id = $response['_scroll_id'];

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

        }
        $this->client->clearScroll(array('scroll_id' => $response['_scroll_id']));

 

错误1：No search context found for id

原因：ES端的scroll_id失效，一般是1）由于PHP中的search($params)设置的size设置过大，导致数据未能及时处理。2）对response数据的处理超时

解决方法：减小size设置，或 排查response的处理耗时