apache hbase shell

usage

1. to invoke non-interactive mode pass -n or --non-interactive option to hbase shell

2. hbase shell in os scripts

        $ echo "describe 'test'" | hbase shell -n
   
        $ echo "describe 'test'" | hbase shell -n > /dev/null 2>&1
   

3. read hbase shell commands from file

        $ pico hbase.cmd
        create 'test', 'cf'
        list 'test'
        put 'test', 'row1', 'cf:a', 'value1'
        put 'test', 'row2', 'cf:b', 'value2'
        put 'test', 'row3', 'cf:c', 'value3'
        put 'test', 'row4', 'cf:d', 'value4'
        scan 'test'
        get 'test', 'row1'
        disable 'test'
        enable 'test' 
        $ habse shell ./hbase.cmd
   

4. passing vm options to shell

        $ HBASE_SHELL_OPTS="-verbose:gc \
        -XX:+PrintGCApplicationStoppedTime \
        -XX:+PrintGCDateStamps \
        -XX:+PrintGCDetails \
        -Xloggc:$HBASE_HOME/log/gc-hbase.log" hbase shell
   

5. shell tricks

   1. assign a table to a variable by using get_table method

       hbase(main):001 > create 't', 'f'
       hbase(main):001 > tab = get_table 't'
       hbase(main):001 > tab.put r1, f, v
       hbase(main):001 > tab.scan
      
       hbase(main):001 > tables = list( t.* )
       hbase(main):001 > tables.map { |t| disable t; drop t}
      

6. debug

   1. shell debug switch

       hbase> debug
      

   2. debug log level

       $ hbase shell -d
      

7. commands

   1. count

       hbase> count 'test', CACHE => 1000
      

fixed

1. can’t create table

   1. when create table

       hbase(main):002:0> create 'test', 'cf'
      
       ERROR: Table already exists: test!
      

   2. try to disable table

       hbase(main):003:0> disable 'test'
      
       ERROR: Table test does not exist.
      

   3. fixed

       # 1. start zookeeper zkCli
       $ bin/zkCli
       Connecting to localhost:2181
       Welcome to ZooKeeper!
       JLine support is enabled
      
       # 2. list /hbase/table
       [zk: localhost:2181(CONNECTED) 1] ls /hbase/table
       [hbase:meta, hbase:namespace, test]
      
       # 3. rm this znode
       [zk: localhost:2181(CONNECTED) 2] rmr /hbase/table
       [zk: localhost:2181(CONNECTED) 3] ls /hbase/table 
       Node does not exist: /hbase/table
      
       # 4. restart hbase then list /hbase/table
       [zk: localhost:2181(CONNECTED) 4] ls /hbase/table
       []