From 969cf67d34ab1e6766ed1c695bcebbf731d0bf72 Mon Sep 17 00:00:00 2001
From: neverchanje <wutao1@xiaomi.com>
Date: Thu, 17 Jan 2019 12:12:32 +0800
Subject: [PATCH] add comment

---
 .../com/xiaomi/infra/pegasus/rpc/async/ReplicaSession.java    | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/com/xiaomi/infra/pegasus/rpc/async/ReplicaSession.java b/src/main/java/com/xiaomi/infra/pegasus/rpc/async/ReplicaSession.java
index 8c90bdf5..b9403ff8 100644
--- a/src/main/java/com/xiaomi/infra/pegasus/rpc/async/ReplicaSession.java
+++ b/src/main/java/com/xiaomi/infra/pegasus/rpc/async/ReplicaSession.java
@@ -328,6 +328,10 @@ private final static class VolatileFields {
     private Bootstrap boot;
     private EventLoopGroup rpcGroup;
 
+    // Session will be actively closed if there're successive timeout errors across
+    // `sessionResetTimeWindowMs`, after which we suspect that the server is unavailable.
+
+    // Timestamp of the first timed out rpc.
     private AtomicLong firstRecentTimedOutMs;
     private static final long sessionResetTimeWindowMs = 10 * 1000; // 10s