From 56f0448f0d46e95f50047636000a73fc754fd0be Mon Sep 17 00:00:00 2001
From: Rene Peinthor <rene.peinthor@linbit.com>
Date: Thu, 8 Feb 2024 19:27:38 +0100
Subject: [PATCH] Linstor fix migration while node offline (#8610)

* linstor: Add util method getBestErrorMessage from main

* linstor: failed remove of allow-two-primaries is no fatal error

* linstor: Fix failure if a Linstor node is down while migrating

If a Linstor node is down while migrating resource, allow-two-primaries
setting will fail because we can't reach the downed node. But it will
still set the property on the other nodes and migration should work.
We now just report an error instead of completely failing.
---
 .../kvm/storage/LinstorStorageAdaptor.java    | 28 +++++++++++++------
 .../storage/datastore/util/LinstorUtil.java   | 11 ++++++++
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/plugins/storage/volume/linstor/src/main/java/com/cloud/hypervisor/kvm/storage/LinstorStorageAdaptor.java b/plugins/storage/volume/linstor/src/main/java/com/cloud/hypervisor/kvm/storage/LinstorStorageAdaptor.java
index 3a703cdb426..426145d9dcc 100644
--- a/plugins/storage/volume/linstor/src/main/java/com/cloud/hypervisor/kvm/storage/LinstorStorageAdaptor.java
+++ b/plugins/storage/volume/linstor/src/main/java/com/cloud/hypervisor/kvm/storage/LinstorStorageAdaptor.java
@@ -269,27 +269,35 @@ public class LinstorStorageAdaptor implements StorageAdaptor {
         }
 
         final DevelopersApi api = getLinstorAPI(pool);
+        String rscName;
         try
         {
-            final String rscName = getLinstorRscName(volumePath);
+            rscName = getLinstorRscName(volumePath);
 
             ResourceMakeAvailable rma = new ResourceMakeAvailable();
             ApiCallRcList answers = api.resourceMakeAvailableOnNode(rscName, localNodeName, rma);
             checkLinstorAnswersThrow(answers);
 
+        } catch (ApiException apiEx) {
+            s_logger.error(apiEx);
+            throw new CloudRuntimeException(apiEx.getBestMessage(), apiEx);
+        }
+
+        try
+        {
             // allow 2 primaries for live migration, should be removed by disconnect on the other end
             ResourceDefinitionModify rdm = new ResourceDefinitionModify();
             Properties props = new Properties();
             props.put("DrbdOptions/Net/allow-two-primaries", "yes");
             rdm.setOverrideProps(props);
-            answers = api.resourceDefinitionModify(rscName, rdm);
+            ApiCallRcList answers = api.resourceDefinitionModify(rscName, rdm);
             if (answers.hasError()) {
                 s_logger.error("Unable to set 'allow-two-primaries' on " + rscName);
-                throw new CloudRuntimeException(answers.get(0).getMessage());
+                // do not fail here as adding allow-two-primaries property is only a problem while live migrating
             }
         } catch (ApiException apiEx) {
             s_logger.error(apiEx);
-            throw new CloudRuntimeException(apiEx.getBestMessage(), apiEx);
+            // do not fail here as adding allow-two-primaries property is only a problem while live migrating
         }
         return true;
     }
@@ -353,19 +361,21 @@ public class LinstorStorageAdaptor implements StorageAdaptor {
                     ApiCallRcList answers = api.resourceDefinitionModify(rsc.get().getName(), rdm);
                     if (answers.hasError())
                     {
-                        s_logger.error("Failed to remove 'allow-two-primaries' on " + rsc.get().getName());
-                        throw new CloudRuntimeException(answers.get(0).getMessage());
+                        s_logger.error(
+                                String.format("Failed to remove 'allow-two-primaries' on %s: %s",
+                                        rsc.get().getName(), LinstorUtil.getBestErrorMessage(answers)));
+                        // do not fail here as removing allow-two-primaries property isn't fatal
                     }
 
                     return true;
                 }
                 s_logger.warn("Linstor: Couldn't find resource for this path: " + localPath);
             } catch (ApiException apiEx) {
-                s_logger.error(apiEx);
-                throw new CloudRuntimeException(apiEx.getBestMessage(), apiEx);
+                s_logger.error(apiEx.getBestMessage());
+                // do not fail here as removing allow-two-primaries property isn't fatal
             }
         }
-        return false;
+        return true;
     }
 
     @Override
diff --git a/plugins/storage/volume/linstor/src/main/java/org/apache/cloudstack/storage/datastore/util/LinstorUtil.java b/plugins/storage/volume/linstor/src/main/java/org/apache/cloudstack/storage/datastore/util/LinstorUtil.java
index ddd15a5984a..cc85c9834eb 100644
--- a/plugins/storage/volume/linstor/src/main/java/org/apache/cloudstack/storage/datastore/util/LinstorUtil.java
+++ b/plugins/storage/volume/linstor/src/main/java/org/apache/cloudstack/storage/datastore/util/LinstorUtil.java
@@ -20,6 +20,8 @@ import com.linbit.linstor.api.ApiClient;
 import com.linbit.linstor.api.ApiException;
 import com.linbit.linstor.api.Configuration;
 import com.linbit.linstor.api.DevelopersApi;
+import com.linbit.linstor.api.model.ApiCallRc;
+import com.linbit.linstor.api.model.ApiCallRcList;
 import com.linbit.linstor.api.model.ProviderKind;
 import com.linbit.linstor.api.model.ResourceGroup;
 import com.linbit.linstor.api.model.StoragePool;
@@ -47,6 +49,15 @@ public class LinstorUtil {
         return new DevelopersApi(client);
     }
 
+    public static String getBestErrorMessage(ApiCallRcList answers) {
+        return answers != null && !answers.isEmpty() ?
+                answers.stream()
+                        .filter(ApiCallRc::isError)
+                        .findFirst()
+                        .map(ApiCallRc::getMessage)
+                        .orElse((answers.get(0)).getMessage()) : null;
+    }
+
     public static long getCapacityBytes(String linstorUrl, String rscGroupName) {
         DevelopersApi linstorApi = getLinstorAPI(linstorUrl);
         try {