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--- hbase [2016/07/01 18:35] – created - external edit 127.0.0.1
+++ hbase [2025/07/21 09:32] (current) – removed steve
@@ Line 1: / Line 1: @@
-====== hbase ======
-  * [[Hadoop]]
-  * [[hdfs]]
-  * [[https://hbase.apache.org/book.html|Apache HBase Reference Guide]]
-  * [[https://wiki.apache.org/hadoop/Hbase/Shell|hbase shell commands]]
-  * [[https://learnhbase.wordpress.com/2013/03/02/hbase-shell-commands/|Learn HBase: shell commands]]
-Start REST server:
-<code>
-hbase-daemon.sh start rest
-</code>
-==== hbase shell ====
-To script stuff through hbase shell, there are two ways. One is to pipe things directly:
-<code>
-echo list | hbase shell
-</code>
-And the other is to write a script:
-<code>
-echo list > test_script
-hbase shell test_script
-</code>
-To save history, add this to ''.irbrc'':
-<code>
-require 'irb/ext/save-history'
-IRB.conf[:SAVE_HISTORY] = 100
-IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb_history"
-Kernel.at_exit do
-    IRB.conf[:AT_EXIT].each do |i|
-        i.call
-    end
-end
-</code>
-** Display status: **
-<code>
-echo status | hbase shell
-servers, 0 dead, 2365.2000 average load
-</code>
-** List tables: **
-<code>
-echo list | hbase shell
-</code>
-** Describe the table: **
-<code>
-echo "describe 'table'" | hbase shell
-</code>
-==== hbase backups ====
-** Exporting a table **
-From the docs: "Export is a utility that will dump the contents of table to HDFS in a sequence file." [[http://hbase.apache.org/book.html#_export|Source]]
-<code>
-hbase org.apache.hadoop.hbase.mapreduce.Export <tablename> <outputdir> [<versions> [<starttime> [<endtime>]]]
-</code>
-For example, exporting table ''table_name'':
-<code>
-hbase org.apache.hadoop.hbase.mapreduce.Export table_name /tmp/table_name
-</code>
-** Importing a table: **
-From the docs: "Import is a utility that will load data that has been exported back into HBase." [[http://hbase.apache.org/book.html#_import|Source]]
-<code>
-hbase -Dhbase.import.version=0.94 org.apache.hadoop.hbase.mapreduce.Import <tablename> <inputdir>
-</code>
-==== TTL ====
-Changing TTL: "ColumnFamilies can set a TTL length in seconds, and HBase will automatically delete rows once the expiration time is reached. This applies to //all// versions of a row - even the current one. The TTL time encoded in the HBase for the row is specified in UTC." [[https://hbase.apache.org/book.html#ttl|Source]]
-Change the TTL (time-to-live), and compact the data, which will erase anything older than that, in this case, one week:
-<code>
-alter 'table', { TTL => 604800 }
-major_compact 'table'
-</code>

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