fix drop host from a zone

src/meta/processors/zone/UpdateZoneProcessor.cpp

@@ -117,6 +117,27 @@ void DropHostFromZoneProcessor::process(const cpp2::DropHostFromZoneReq& req) {
     return;
   }
 
+  const auto& spacePrefix = MetaServiceUtils::spacePrefix();
+  auto spaceIterRet = doPrefix(spacePrefix);
+  auto spaceIter = nebula::value(spaceIterRet).get();
+  while (spaceIter->valid()) {
+    auto spaceId = MetaServiceUtils::spaceId(spaceIter->key());
+    const auto& partPrefix = MetaServiceUtils::partPrefix(spaceId);
+    auto partIterRet = doPrefix(partPrefix);
+    auto partIter = nebula::value(partIterRet).get();
+    while (partIter->valid()) {
+      auto partHosts = MetaServiceUtils::parsePartVal(partIter->val());
+      for (auto& h : partHosts) {
+        if (h == req.get_node()) {
+          LOG(ERROR) << h << " is related with partition";
+          handleErrorCode(nebula::cpp2::ErrorCode::E_CONFLICT);
+          onFinished();
+          return;
+        }
+      }
+    }
+  }
+
   auto hosts = MetaServiceUtils::parseZoneHosts(std::move(nebula::value(zoneValueRet)));
   auto host = req.get_node();
   auto iter = std::find(hosts.begin(), hosts.end(), host);