Big data- Lab

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Big Data – Hadoop Ecosystems

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Lab #3

  • Import the accounts table into HDFS file system:

    • 1) Import account:

    $ sqoop import \
    –connect jdbc:mysql://localhost/loudacre \
    –username training –password training \
    –table accounts \
    –target-dir /loudacre/accounts \
    –null-non-string ‘\\N’

    2) List the contents of the accounts directory:

    $ hdfs dfs -ls /loudacre/accounts

    3) Import incremental updates to accounts

    As Loudacre adds new accounts in MySQL accounts table, the account data in HDFS must be
    updated as accounts are created. You can use Sqoop to append these new records.

    Run the add_new_accounts.py script to add the latest accounts to MySQL.

    $ DEV1/exercises/sqoop/add_new_accounts.py

    Incrementally import and append the newly added accounts to the accounts
    directory. Use Sqoop to import on the last value on the acct_num column
    largest account ID:

    $ sqoop import \
    –connect jdbc:mysql://localhost/loudacre \
    –username training –password training \
    –incremental append \
    –null-non-string ‘\\N’ \
    –table accounts \
    –target-dir /loudacre/accounts \
    –check-column acct_num \
    –last-value

    4) You should see three new files. Use Hadoop’s cat command to view the entire contents of
    these files.

    hdfs dfs -cat /loudacre/accounts/part-m-0000[456]

      Import the accounts table into HDFS file system:

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