From dd1aa88dddded6bc184ad5dc52608e1509b0a13a Mon Sep 17 00:00:00 2001
From: Duo Zhang <zhangduo@apache.org>
Date: Mon, 19 Nov 2018 17:11:07 +0800
Subject: [PATCH] HBASE-21377 Add debug log for procedure stack id related
 operations

---
 .../apache/hadoop/hbase/procedure2/RootProcedureState.java   | 5 +++++
 .../hadoop/hbase/procedure2/store/wal/WALProcedureTree.java  | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RootProcedureState.java b/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RootProcedureState.java
index 2fc00301e91..a7cdaabb248 100644
--- a/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RootProcedureState.java
+++ b/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RootProcedureState.java
@@ -24,6 +24,8 @@ import java.util.List;
 import java.util.Set;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ProcedureProtos.ProcedureState;
 
@@ -42,6 +44,8 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.ProcedureProtos.Procedu
 @InterfaceStability.Evolving
 class RootProcedureState<TEnvironment> {
 
+  private static final Logger LOG = LoggerFactory.getLogger(RootProcedureState.class);
+
   private enum State {
     RUNNING,         // The Procedure is running or ready to run
     FAILED,          // The Procedure failed, waiting for the rollback executing
@@ -146,6 +150,7 @@ class RootProcedureState<TEnvironment> {
       subprocStack = new ArrayList<>();
     }
     proc.addStackIndex(subprocStack.size());
+    LOG.debug("Add procedure {} as the {}th rollback step", proc, subprocStack.size());
     subprocStack.add(proc);
   }
 
diff --git a/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/WALProcedureTree.java b/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/WALProcedureTree.java
index c32bd7f6d8c..6e624b4fca2 100644
--- a/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/WALProcedureTree.java
+++ b/hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/WALProcedureTree.java
@@ -145,6 +145,9 @@ public final class WALProcedureTree {
 
   private void collectStackId(Entry entry, Map<Integer, List<Entry>> stackId2Proc,
       MutableInt maxStackId) {
+    if (LOG.isDebugEnabled()) {
+      LOG.debug("Procedure {} stack ids={}", entry, entry.proc.getStackIdList());
+    }
     for (int i = 0, n = entry.proc.getStackIdCount(); i < n; i++) {
       int stackId = entry.proc.getStackId(i);
       if (stackId > maxStackId.intValue()) {