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Subsections
Accumulo provides a simple shell that can be used to examine the contents and configuration settings of tables, apply individual mutations, and change configuration settings.
The shell can be started by the following command:
$ACCUMULO_HOME/bin/accumulo shell -u [username]
The shell will prompt for the corresponding password to the username specified and then display the following prompt:
Shell - Apache Accumulo Interactive Shell - - version 1.3 - instance name: myinstance - instance id: 00000000-0000-0000-0000-000000000000 - - type 'help' for a list of available commands -
The Accumulo shell can be used to create and delete tables, as well as to configure table and instance specific options.
root@myinstance> tables !METADATA root@myinstance> createtable mytable root@myinstance mytable> root@myinstance mytable> tables !METADATA mytable root@myinstance mytable> createtable testtable root@myinstance testtable> root@myinstance junk> deletetable testtable root@myinstance>
The Shell can also be used to insert updates and scan tables. This is useful for inspecting tables.
root@myinstance mytable> scan root@myinstance mytable> insert row1 colf colq value1 insert successful root@myinstance mytable> scan row1 colf:colq [] value1
The compact command instructs Accumulo to schedule a compaction of the table during which files are consolidated and deleted entries are removed.
root@myinstance mytable> compact -t mytable 07 16:13:53,201 [shell.Shell] INFO : Compaction of table mytable scheduled for 20100707161353EDT
The flush command instructs Accumulo to write all entries currently in memory for a given table to disk.
root@myinstance mytable> flush -t mytable 07 16:14:19,351 [shell.Shell] INFO : Flush of table mytable initiated...
The Shell can be used to add, remove, and grant privileges to users.
root@myinstance mytable> createuser bob Enter new password for 'bob': ********* Please confirm new password for 'bob': ********* root@myinstance mytable> authenticate bob Enter current password for 'bob': ********* Valid root@myinstance mytable> grant System.CREATE_TABLE -s -u bob root@myinstance mytable> user bob Enter current password for 'bob': ********* bob@myinstance mytable> userpermissions System permissions: System.CREATE_TABLE Table permissions (!METADATA): Table.READ Table permissions (mytable): NONE bob@myinstance mytable> createtable bobstable bob@myinstance bobstable> bob@myinstance bobstable> user root Enter current password for 'root': ********* root@myinstance bobstable> revoke System.CREATE_TABLE -s -u bob
** Next:** Writing Accumulo Clients ** Up:** Apache Accumulo User Manual Version 1.3 ** Previous:** Accumulo Design ** Contents**