38/57

# is.hdfs.id

Indicates whether an R object contains a valid HDFS file identifier.

Usage

    is.hdfs.id(x)

Arguments

x

  The name of an R object.

Return Value

`TRUE` if x is a valid HDFS identifier, or `FALSE` if it is not

See Also

`hdfs.attach`, `hdfs.id`

Example

This example shows that `dfs` contains a valid HDFS identifier, which was returned by `hdfs.attach`:

    R> dfs <- hdfs.attach('ontime_R')
    R> is.hdfs.id(dfs)
    [1] TRUE
    R> print(dfs)
    [1] "/user/oracle/xq/ontime_R"
    attr(,"dfs.id")
    [1] TRUE

The next example shows that a valid file name passed as a string is not recognized as a valid file identifier:

    R> is.hdfs.id('/user/oracle/xq/ontime_R')
    [1] FALSE