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The map that is returned has the node id as the key and a {@link Decision}\n      * as the decision for the given node.\n      */\n     @Nullable\n-    public Map<String, Decision> getNodeDecisions() {\n-        return nodeDecisions;\n+    public Map<String, NodeExplanation> getNodeDecisions() {\n+        return nodeExplanations;\n+    }\n+\n+    /**\n+     * Gets the decision on allocating a shard, without examining any specific nodes to allocate to\n+     * (e.g. a replica can never be allocated if the primary is not allocated, so this is a shard-level\n+     * decision, not having taken any node into account).\n+     */\n+    @Nullable\n+    public Decision getShardDecision() {\n+        return shardDecision;\n+    }\n+\n+    /**\n+     * This class represents the shard allocation explanation for a single node,\n+     * including the {@link Decision} whether to allocate to the node and the\n+     * weight assigned to the node for the shard in question.\n+     */\n+    public static final class NodeExplanation {","path":"core/src/main/java/org/elasticsearch/cluster/routing/allocation/ShardAllocationDecision.java","position":158,"original_position":158,"commit_id":"a017a59c7e9ea6a8440ecf08bfb79bc0e0a40193","original_commit_id":"a017a59c7e9ea6a8440ecf08bfb79bc0e0a40193","user":{"login":"ywelsch","id":3718355,"avatar_url":"https://avatars.githubusercontent.com/u/3718355?v=3","gravatar_id":"","url":"https://api.github.com/users/ywelsch","html_url":"https://github.com/ywelsch","followers_url":"https://api.github.com/users/ywelsch/followers","following_url":"https://api.github.com/users/ywelsch/following{/other_user}","gists_url":"https://api.github.com/users/ywelsch/gists{/gist_id}","starred_url":"https://api.github.com/users/ywelsch/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ywelsch/subscriptions","organizations_url":"https://api.github.com/users/ywelsch/orgs","repos_url":"https://api.github.com/users/ywelsch/repos","events_url":"https://api.github.com/users/ywelsch/events{/privacy}","received_events_url":"https://api.github.com/users/ywelsch/received_events","type":"User","site_admin":false},"body":"Maybe name this class `WeightedDecision`?","created_at":"2016-10-19T10:19:15Z","updated_at":"2016-10-19T10:23:02Z","html_url":"https://github.com/elastic/elasticsearch/pull/20634#discussion_r84039013","pull_request_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20634","_links":{"self":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/84039013"},"html":{"href":"https://github.com/elastic/elasticsearch/pull/20634#discussion_r84039013"},"pull_request":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/20634"}}},"pull_request":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20634","id":86382029,"html_url":"https://github.com/elastic/elasticsearch/pull/20634","diff_url":"https://github.com/elastic/elasticsearch/pull/20634.diff","patch_url":"https://github.com/elastic/elasticsearch/pull/20634.patch","issue_url":"https://api.github.com/repos/elastic/elasticsearch/issues/20634","number":20634,"state":"open","locked":false,"title":"Separates decision making from decision application in BalancedShardsAllocator ","user":{"login":"abeyad","id":1631297,"avatar_url":"https://avatars.githubusercontent.com/u/1631297?v=3","gravatar_id":"","url":"https://api.github.com/users/abeyad","html_url":"https://github.com/abeyad","followers_url":"https://api.github.com/users/abeyad/followers","following_url":"https://api.github.com/users/abeyad/following{/other_user}","gists_url":"https://api.github.com/users/abeyad/gists{/gist_id}","starred_url":"https://api.github.com/users/abeyad/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abeyad/subscriptions","organizations_url":"https://api.github.com/users/abeyad/orgs","repos_url":"https://api.github.com/users/abeyad/repos","events_url":"https://api.github.com/users/abeyad/events{/privacy}","received_events_url":"https://api.github.com/users/abeyad/received_events","type":"User","site_admin":false},"body":"Refactors the BalancedShardsAllocator to create a method that\r\nprovides an allocation decision for allocating a single\r\nunassigned shard or a single started shard that can no longer\r\nremain on its current node.  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