protected void handleNodegroupDropStatement(MetadataProvider metadataProvider, Statement stmt) throws Exception { NodeGroupDropStatement stmtDelete = (NodeGroupDropStatement) stmt; SourceLocation sourceLoc = stmtDelete.getSourceLocation(); String nodegroupName = stmtDelete.getNodeGroupName().getValue(); MetadataTransactionContext mdTxnCtx = MetadataManager.INSTANCE.beginTransaction(); metadataProvider.setMetadataTxnContext(mdTxnCtx); lockManager.acquireNodeGroupWriteLock(metadataProvider.getLocks(), nodegroupName); try { NodeGroup ng = MetadataManager.INSTANCE.getNodegroup(mdTxnCtx, nodegroupName); if (ng == null) { if (!stmtDelete.getIfExists()) { throw new CompilationException(ErrorCode.UNKNOWN_NODEGROUP, sourceLoc, nodegroupName); } } else { MetadataManager.INSTANCE.dropNodegroup(mdTxnCtx, nodegroupName, false); } MetadataManager.INSTANCE.commitTransaction(mdTxnCtx); } catch (Exception e) { abort(e, e, mdTxnCtx); throw e; } finally { metadataProvider.getLocks().unlock(); } }