Example #1
0
// Locates the region in which the given row key for the given table is.
func (c *Client) locateRegion(ctx context.Context,
	table, key []byte) (*regioninfo.Info, string, uint16, error) {

	metaKey := createRegionSearchKey(table, key)
	rpc, err := hrpc.NewGetBefore(ctx, metaTableName, metaKey, hrpc.Families(infoFamily))
	if err != nil {
		return nil, "", 0, err
	}
	rpc.SetRegion(c.metaRegionInfo)
	resp, err := c.sendRPC(rpc)

	if err != nil {
		ch := c.metaRegionInfo.GetAvailabilityChan()
		if ch != nil {
			select {
			case <-ch:
				return c.locateRegion(ctx, table, key)
			case <-rpc.GetContext().Done():
				return nil, "", 0, ErrDeadline
			}
		} else {
			return nil, "", 0, err
		}
	}

	metaRow := resp.(*pb.GetResponse)
	if metaRow.Result == nil {
		return nil, "", 0, TableNotFound
	}

	reg, host, port, err := c.parseMetaTableResponse(metaRow)
	if err != nil {
		return nil, "", 0, err
	}
	if !bytes.Equal(table, reg.Table) {
		// This would indicate a bug in HBase.
		return nil, "", 0, fmt.Errorf("WTF: Meta returned an entry for the wrong table!"+
			"  Looked up table=%q key=%q got region=%s", table, key, reg)
	} else if len(reg.StopKey) != 0 &&
		bytes.Compare(key, reg.StopKey) >= 0 {
		// This would indicate a hole in the meta table.
		return nil, "", 0, fmt.Errorf("WTF: Meta returned an entry for the wrong region!"+
			"  Looked up table=%q key=%q got region=%s", table, key, reg)
	}
	return reg, host, port, nil
}
Example #2
0
// Locates the region in which the given row key for the given table is.
func (c *Client) locateRegion(ctx context.Context, table, key []byte) (*region.Client, *regioninfo.Info, error) {
	metaKey := createRegionSearchKey(table, key)
	rpc, _ := hrpc.NewGetBefore(ctx, metaTableName, metaKey, hrpc.Families(infoFamily))
	rpc.SetRegion(c.metaRegionInfo)
	resp, err := c.sendRPC(rpc)

	if err != nil {
		ch := c.metaRegionInfo.GetAvailabilityChan()
		if ch != nil {
			select {
			case <-ch:
				return c.locateRegion(ctx, table, key)
			case <-rpc.GetContext().Done():
				return nil, nil, ErrDeadline
			}
		} else {
			return nil, nil, err
		}
	}

	return c.discoverRegion(ctx, resp.(*pb.GetResponse))
}