Examples of org.apache.accumulo.master.tableOps.TableRangeOp

org.apache.accumulo.master.tableOps.TableRangeOp

Merge makes things hard. Typically, a client will read the list of tablets, and begin an operation on that tablet at the location listed in the metadata table. When a tablet splits, the information read from the metadata table doesn't match reality, so the operation fails, and must be retried. But the operation will take place either on the parent, or at a later time on the children. It won't take place on just half of the tablet. However, when a merge occurs, the operation may have succeeded on one section of the merged area, and not on the others, when the merge occurs. There is no way to retry the request at a later time on an unmodified tablet. The code below uses read-write lock to prevent some operations while a merge is taking place. Normal operations, like bulk imports, will grab the read lock and prevent merges (writes) while they run. Merge operations will lock out some operations while they run.


        if (!master.security.canMerge(c, tableId, namespaceId))
          throw new ThriftSecurityException(c.getPrincipal(), SecurityErrorCode.PERMISSION_DENIED);


        Master.log.debug("Creating merge op: " + tableId + " " + startRow + " " + endRow);
        master.fate.seedTransaction(opid, new TraceRepo<Master>(new TableRangeOp(MergeInfo.Operation.MERGE, tableId, startRow, endRow)), autoCleanup);
        break;
      }
      case TABLE_DELETE_RANGE: {
        TableOperation tableOp = TableOperation.DELETE_RANGE;
        String tableName = validateTableNameArgument(arguments.get(0), tableOp, Tables.NOT_SYSTEM);
        Text startRow = ByteBufferUtil.toText(arguments.get(1));
        Text endRow = ByteBufferUtil.toText(arguments.get(2));


        final String tableId = ClientServiceHandler.checkTableId(master.getInstance(), tableName, tableOp);
        String namespaceId = Tables.getNamespaceId(master.getInstance(), tableId);


        if (!master.security.canDeleteRange(c, tableId, tableName, startRow, endRow, namespaceId))
          throw new ThriftSecurityException(c.getPrincipal(), SecurityErrorCode.PERMISSION_DENIED);


        master.fate.seedTransaction(opid, new TraceRepo<Master>(new TableRangeOp(MergeInfo.Operation.DELETE, tableId, startRow, endRow)), autoCleanup);
        break;
      }
      case TABLE_BULK_IMPORT: {
        TableOperation tableOp = TableOperation.BULK_IMPORT;
        String tableName = validateTableNameArgument(arguments.get(0), tableOp, Tables.NOT_SYSTEM);

Examples of org.apache.accumulo.master.tableOps.TableRangeOp

Related Classes of org.apache.accumulo.master.tableOps.TableRangeOp