Hbase shell - how to write byte value

Question

I want to write a value say 65 in hbase. I have to run the following command on hbase shell for that:

put 'table','key','cf:qual','A'

But is there a way to write it directly something like:

put 'table','key','cf:qual',65 (this is not allowed though)

Let me know if you understand the question else I will explain more.

Update:

By 65 I meant to put 'A' but directly the ascii value of 'A'. The real issue for me is I want to put values which fall in the range of 128-255 from the shell.

doesn't put 'table','key','cf:qual','65' puts 65 in the table?..if i am understanding the question right.. — Chandra kant
– Chandra kant, Commented Mar 27, 2014 at 9:41

Nanda · Accepted Answer · 2022-04-01 17:05:48Z

22

Since Hbase Shell is implemented using ruby, you can insert byte values by representing them in hexadecimal format.

For example if you want to insert a byte value 255

hex representation of 255 is FF. In Hbase shell we should give it as stringBinary which is "\xFF"

The "\x" is a special escape character to encode an arbitrary byte from hex, so "\xFF" means byte 0xFF.

so put 'table', 'rowkey', 'cf:qual', "\xFF" will insert the byte 255

Note: The value has to be with in " " (double quotes) not ' ' (single quotes).

Useful links:

How Does Ruby handle bytes/binary

Hexadecimal Digits (Hex-Codes) Cheatsheet

edited Apr 1, 2022 at 17:05

answered Apr 11, 2014 at 9:48

Nanda

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3 Comments

C_McDavid_97 Over a year ago

So how would one convert say \xFF to binary?

Nanda Over a year ago

Please refer: hexadecimal to binary conversion, Conversion Table. Hex is 4 bit long, so FF will be 1111 1111.

C_McDavid_97 Over a year ago

Thanks. I figured it out shortly after posing the question.

linehrr · Accepted Answer · 2017-03-06 17:19:12Z

7

you can also use Hbase built in functions like this

> put 'table','rowkey','cf:qua', Bytes.toBytes(1234)

it works for me.

answered Mar 6, 2017 at 17:19

linehrr

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2 Comments

Sushant Gupta Over a year ago

Correct approach for storing int

jrg Over a year ago

but no use for encoding a Long.

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