[#873] Give each backend its own compressed schema trees (#881)

Valery Kharseko

18 hours ago 655132fb059cfa70fb338d54f1bb0fb48198fb0f

 opendj-server-legacy/src/main/java/org/opends/server/backends/pluggable/RootContainer.java

@@ -137,10 +137,13 @@
        @Override
        public void run(WriteableTransaction txn) throws Exception
        {
          compressedSchema = new PersistentCompressedSchema(serverContext, storage, txn, accessMode);
          compressedSchema = new PersistentCompressedSchema(serverContext, backendId, storage, txn, accessMode);
          openAndRegisterEntryContainers(txn, config.getBaseDN(), accessMode);
        }
      });
      // after the write, never inside it: a compressed schema migration is only worth reporting
      // once the transaction that copied it has committed, and a replayed operation runs twice
      compressedSchema.reportMigration();
    }
    catch(StorageRuntimeException e)
    {