| # |
| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| module Shell |
| module Commands |
| class AlterAsync < Command |
| def help |
| return <<-EOF |
| Alter column family schema, does not wait for all regions to receive the |
| schema changes. Pass table name and a dictionary specifying new column |
| family schema. Dictionaries are described on the main help command output. |
| Dictionary must include name of column family to alter. For example, |
| |
| To change or add the 'f1' column family in table 't1' from defaults |
| to instead keep a maximum of 5 cell VERSIONS, do: |
| |
| hbase> alter_async 't1', NAME => 'f1', VERSIONS => 5 |
| |
| To delete the 'f1' column family in table 'ns1:t1', do: |
| |
| hbase> alter_async 'ns1:t1', NAME => 'f1', METHOD => 'delete' |
| |
| or a shorter version: |
| |
| hbase> alter_async 'ns1:t1', 'delete' => 'f1' |
| |
| You can also change table-scope attributes like MAX_FILESIZE |
| MEMSTORE_FLUSHSIZE, READONLY, and DEFERRED_LOG_FLUSH. |
| |
| For example, to change the max size of a family to 128MB, do: |
| |
| hbase> alter 't1', METHOD => 'table_att', MAX_FILESIZE => '134217728' |
| |
| There could be more than one alteration in one command: |
| |
| hbase> alter 't1', {NAME => 'f1'}, {NAME => 'f2', METHOD => 'delete'} |
| |
| To check if all the regions have been updated, use alter_status <table_name> |
| EOF |
| end |
| |
| def command(table, *args) |
| admin.alter(table, false, *args) |
| end |
| end |
| end |
| end |