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Date: Wed, 24 Jun 2015 14:33:23 -0400
Message-ID: 
 <CAGUtCHqY7W39htSpVNO0Ki10jcaVRF4LT46g3DF09n16Fo_Zig@mail.gmail.com>
Subject: Re: How to generate UUID in real time environment for Accumulo
From: Keith Turner <keith@deenlo.com>
To: user@accumulo.apache.org
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Could look into using Lexicoders.  The following program prints out 19.
However this will vary depending on how many leading 0 bytes the longs
have, because those are dropped.

    long time = System.currentTimeMillis();

    ListLexicoder<Long> ll =  new ListLexicoder<Long>(new ULongLexicoder());

    List<Long> list = Arrays.asList(new Long[3]);
    list.set(0, time);
    list.set(1, 123456l);
    list.set(2, 987654l);

    byte[] b = ll.encode(list);

    System.out.println(b.length);

On Wed, Jun 24, 2015 at 2:32 AM, mohit.kaushik <mohit.kaushik@orkash.com>
wrote:

> On 06/23/2015 06:44 PM, Keith Turner wrote:
>
>> row=<time>_<client id>_<client counter>
>>
> this will definitely generate a UUID but if I use "14 digits for <time> +
> 12 digits for <client_id> + say 6 digits for <client_counter>" which makes
> the UUID 32 bit long. I want UUID to be 16 digits long.
>
> Can you suggest some encoding technique which can encode it to 16 digits
> and also maintains the time order?
>
> -Mohit kaushik
>
>

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<div dir=3D"ltr"><div>Could look into using Lexicoders.=C2=A0 The following=
 program prints out 19.=C2=A0 However this will vary depending on how many =
leading 0 bytes the longs have, because those are dropped. =C2=A0 =C2=A0 =
=C2=A0</div><div><br></div><div>=C2=A0 =C2=A0 long time =3D System.currentT=
imeMillis();</div><div><br></div><div>=C2=A0 =C2=A0 ListLexicoder&lt;Long&g=
t; ll =3D =C2=A0new ListLexicoder&lt;Long&gt;(new ULongLexicoder());</div><=
div><br></div><div>=C2=A0 =C2=A0 List&lt;Long&gt; list =3D Arrays.asList(ne=
w Long[3]);</div><div>=C2=A0 =C2=A0 list.set(0, time);</div><div>=C2=A0 =C2=
=A0 list.set(1, 123456l);</div><div>=C2=A0 =C2=A0 list.set(2, 987654l);</di=
v><div><br></div><div>=C2=A0 =C2=A0 byte[] b =3D ll.encode(list);</div><div=
><br></div><div>=C2=A0 =C2=A0 System.out.println(b.length);</div></div><div=
 class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Jun 24, 2015 =
at 2:32 AM, mohit.kaushik <span dir=3D"ltr">&lt;<a href=3D"mailto:mohit.kau=
shik@orkash.com" target=3D"_blank">mohit.kaushik@orkash.com</a>&gt;</span> =
wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex"><span class=3D"">On 06/23/2015 06:=
44 PM, Keith Turner wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
row=3D&lt;time&gt;_&lt;client id&gt;_&lt;client counter&gt;<br>
</blockquote></span>
this will definitely generate a UUID but if I use &quot;14 digits for &lt;t=
ime&gt; + 12 digits for &lt;client_id&gt; + say 6 digits for &lt;client_cou=
nter&gt;&quot; which makes the UUID 32 bit long. I want UUID to be 16 digit=
s long.<br>
<br>
Can you suggest some encoding technique which can encode it to 16 digits an=
d also maintains the time order?<span class=3D"HOEnZb"><font color=3D"#8888=
88"><br>
<br>
-Mohit kaushik<br>
<br>
</font></span></blockquote></div><br></div>

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