From cf539a21587d18c97e7597c028882a5cbfbf8319 Mon Sep 17 00:00:00 2001
From: Jason Tedor <jason@tedor.me>
Date: Tue, 8 Sep 2015 08:38:24 -0400
Subject: [PATCH] Add trace logging before sending single shard requests

---
 .../support/single/shard/TransportSingleShardAction.java  | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/src/main/java/org/elasticsearch/action/support/single/shard/TransportSingleShardAction.java b/core/src/main/java/org/elasticsearch/action/support/single/shard/TransportSingleShardAction.java
index 8af13cb50ff..b5d41af939c 100644
--- a/core/src/main/java/org/elasticsearch/action/support/single/shard/TransportSingleShardAction.java
+++ b/core/src/main/java/org/elasticsearch/action/support/single/shard/TransportSingleShardAction.java
@@ -210,6 +210,14 @@ public abstract class TransportSingleShardAction<Request extends SingleShardRequ
                 onFailure(shardRouting, new NoShardAvailableActionException(shardRouting.shardId()));
             } else {
                 internalRequest.request().internalShardId = shardRouting.shardId();
+                if (logger.isTraceEnabled()) {
+                    logger.trace(
+                            "sending request [{}] to shard [{}] on node [{}]",
+                            internalRequest.request(),
+                            internalRequest.request().internalShardId,
+                            node
+                    );
+                }
                 transportService.sendRequest(node, transportShardAction, internalRequest.request(), new BaseTransportResponseHandler<Response>() {
 
                     @Override