From db7ff2d7968bc42de7d1b6084d53c1259a9ec263 Mon Sep 17 00:00:00 2001
From: Daniel Mitterdorfer <daniel@mitterdorfer.name>
Date: Tue, 24 Sep 2019 10:30:59 +0200
Subject: [PATCH] Emit log message when parent circuit breaker trips

We emit a debug log message whenever a child circuit breaker trips (in
`ChildMemoryCircuitBreaker#circuitBreak(String, long)`) but we never
emit a log message when the parent circuit breaker trips. As this is
more likely to happen with the real memory circuit breaker it is not
possible to detect this in the logs. With this commit we add a log
message on the same log level (debug) when the parent circuit breaker
trips.
---
 .../indices/breaker/HierarchyCircuitBreakerService.java          | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/src/main/java/org/elasticsearch/indices/breaker/HierarchyCircuitBreakerService.java b/server/src/main/java/org/elasticsearch/indices/breaker/HierarchyCircuitBreakerService.java
index 5797843161c59..536d0b15b5f23 100644
--- a/server/src/main/java/org/elasticsearch/indices/breaker/HierarchyCircuitBreakerService.java
+++ b/server/src/main/java/org/elasticsearch/indices/breaker/HierarchyCircuitBreakerService.java
@@ -339,6 +339,7 @@ public void checkParentLimit(long newBytesReserved, String label) throws Circuit
             // child circuit breakers is categorized as transient or permanent.
             CircuitBreaker.Durability durability = memoryUsed.transientChildUsage >= memoryUsed.permanentChildUsage ?
                 CircuitBreaker.Durability.TRANSIENT : CircuitBreaker.Durability.PERMANENT;
+            logger.debug("{}", message);
             throw new CircuitBreakingException(message.toString(), memoryUsed.totalUsage, parentLimit, durability);
         }
     }