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Message-ID: 
 <CAP9VaaRG_shHddd3oGZhjZkWQkw51H_wvjtjACzTPEz++=SeSQ@mail.gmail.com>
Subject: Is there any way to set a string name for a ledger and how to do
 checkpoint ?
From: Stone <stones.gao@gmail.com>
To: bookkeeper-user@zookeeper.apache.org
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--f46d042dfcd5389e9b04c13c6a41
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Hello,

I am new to BookKeeper. Played with the BookKeeper API, I can create a
ledger  like the following:

  val lh = client.createLedger(3, 2, BookKeeper.DigestType.CRC32, "foobar".
getBytes);

and open an existing one with :

val lh2 = client.openLedger(ledgerId, BookKeeper.DigestType.CRC32,
"foobar".getBytes);



but it seems there's no way to give ledger a string name (or ledger id
manually) like a name for a log file.

Another the question is how can I do checkpointing using BookKeeper ?  What
I need is like write WAL to ledger when the old changes applied I can call

  ledger.checkPoint()  // which can delete old log entries in a certain
ledger.


Any suggestions ?

Thanks & Best Regards,
Stone

--f46d042dfcd5389e9b04c13c6a41
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Content-Transfer-Encoding: quoted-printable

Hello, <br><br>I am new to BookKeeper. Played with the BookKeeper API, I ca=
n create a ledger=A0 like the following: <span class=3D"k" style=3D"margin:=
0px;padding:0px;line-height:1.4em;font-weight:bold"><br><br>=A0 val</span> =
<span class=3D"n" style=3D"margin:0px;padding:0px;line-height:1.4em">lh</sp=
an> <span class=3D"k" style=3D"margin:0px;padding:0px;line-height:1.4em;fon=
t-weight:bold">=3D</span> <span class=3D"n" style=3D"margin:0px;padding:0px=
;line-height:1.4em">client</span><span class=3D"o" style=3D"margin:0px;padd=
ing:0px;line-height:1.4em;font-weight:bold">.</span><span class=3D"n" style=
=3D"margin:0px;padding:0px;line-height:1.4em">createLedger</span><span clas=
s=3D"o" style=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bold"=
>(</span><span class=3D"mi" style=3D"margin:0px;padding:0px;line-height:1.4=
em;color:rgb(0,153,153)">3</span><span class=3D"o" style=3D"margin:0px;padd=
ing:0px;line-height:1.4em;font-weight:bold">,</span> <span class=3D"mi" sty=
le=3D"margin:0px;padding:0px;line-height:1.4em;color:rgb(0,153,153)">2</spa=
n><span class=3D"o" style=3D"margin:0px;padding:0px;line-height:1.4em;font-=
weight:bold">,</span> <span class=3D"nc" style=3D"margin:0px;padding:0px;li=
ne-height:1.4em;color:rgb(68,85,136);font-weight:bold">BookKeeper</span><sp=
an class=3D"o" style=3D"margin:0px;padding:0px;line-height:1.4em;font-weigh=
t:bold">.</span><span class=3D"nc" style=3D"margin:0px;padding:0px;line-hei=
ght:1.4em;color:rgb(68,85,136);font-weight:bold">DigestType</span><span cla=
ss=3D"o" style=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bold=
">.</span><span class=3D"nc" style=3D"margin:0px;padding:0px;line-height:1.=
4em;color:rgb(68,85,136);font-weight:bold">CRC32</span><span class=3D"o" st=
yle=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bold">,</span> =
<span class=3D"s" style=3D"margin:0px;padding:0px;line-height:1.4em;color:r=
gb(221,17,68)">&quot;foobar&quot;</span><span class=3D"o" style=3D"margin:0=
px;padding:0px;line-height:1.4em;font-weight:bold">.</span><span class=3D"n=
" style=3D"margin:0px;padding:0px;line-height:1.4em">getBytes</span><span c=
lass=3D"o" style=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bo=
ld">);</span><br>
<br>and open an existing one with : <br><br><pre style=3D"margin:0px;paddin=
g:0px;font-family:&#39;Bitstream Vera Sans Mono&#39;,Courier,monospace;font=
-size:12px;font-style:normal;font-variant:normal;font-weight:normal;line-he=
ight:1.4em;color:rgb(0,0,0);letter-spacing:normal;text-align:left;text-inde=
nt:0px;text-transform:none;word-spacing:0px">
<div class=3D"line" id=3D"LC17" style=3D"margin:0px;padding:0px 0px 0px 1em=
;line-height:1.4em"><span class=3D"k" style=3D"margin:0px;padding:0px;line-=
height:1.4em;font-weight:bold">val</span> <span class=3D"n" style=3D"margin=
:0px;padding:0px;line-height:1.4em">lh2</span> <span class=3D"k" style=3D"m=
argin:0px;padding:0px;line-height:1.4em;font-weight:bold">=3D</span> <span =
class=3D"n" style=3D"margin:0px;padding:0px;line-height:1.4em">client</span=
><span class=3D"o" style=3D"margin:0px;padding:0px;line-height:1.4em;font-w=
eight:bold">.</span><span class=3D"n" style=3D"margin:0px;padding:0px;line-=
height:1.4em">openLedger</span><span class=3D"o" style=3D"margin:0px;paddin=
g:0px;line-height:1.4em;font-weight:bold">(</span><span class=3D"n" style=
=3D"margin:0px;padding:0px;line-height:1.4em">ledgerId</span><span class=3D=
"o" style=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bold">,</=
span> <span class=3D"nc" style=3D"margin:0px;padding:0px;line-height:1.4em;=
color:rgb(68,85,136);font-weight:bold">BookKeeper</span><span class=3D"o" s=
tyle=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bold">.</span>=
<span class=3D"nc" style=3D"margin:0px;padding:0px;line-height:1.4em;color:=
rgb(68,85,136);font-weight:bold">DigestType</span><span class=3D"o" style=
=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bold">.</span><spa=
n class=3D"nc" style=3D"margin:0px;padding:0px;line-height:1.4em;color:rgb(=
68,85,136);font-weight:bold">CRC32</span><span class=3D"o" style=3D"margin:=
0px;padding:0px;line-height:1.4em;font-weight:bold">,</span> <span class=3D=
"s" style=3D"margin:0px;padding:0px;line-height:1.4em;color:rgb(221,17,68)"=
>&quot;foobar&quot;</span><span class=3D"o" style=3D"margin:0px;padding:0px=
;line-height:1.4em;font-weight:bold">.</span><span class=3D"n" style=3D"mar=
gin:0px;padding:0px;line-height:1.4em">getBytes</span><span class=3D"o" sty=
le=3D"margin:0px;padding:0px;line-height:1.4em;font-weight:bold">);</span><=
/div>
</pre><br><br>but it seems there&#39;s no way to give ledger a string name =
(or ledger id manually) like a name for a log file.=A0 <br><br>Another the =
question is how can I do checkpointing using BookKeeper ?=A0 What I need is=
 like write WAL to ledger when the old changes applied I can call <br>
=A0 <br>=A0 ledger.checkPoint()=A0 // which can delete old log entries in a=
 certain ledger. <br><br><br>Any suggestions ? <br class=3D"Apple-interchan=
ge-newline"><br>Thanks &amp; Best Regards,<br>Stone<br><br>

--f46d042dfcd5389e9b04c13c6a41--