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From: Watanabe Maki <watanabe.maki@gmail.com>
Subject: Re: snapshot files locked
Date: Thu, 15 Mar 2012 09:06:49 +0900
To: Watanabe Maki <watanabe.maki@gmail.com>

Typo

> 2. MKLINK /D LINK.TXT ORIG.TXT

MKLINK /H


On 2012/03/15, at 9:04, Watanabe Maki <watanabe.maki@gmail.com> wrote:

> It's true on unix, but you can't delete hard links of opened files on wind=
ows.
> Try following:
> 1  Create a text file ORIG.TXT
> 2. MKLINK /D LINK.TXT ORIG.TXT
>  Now you have hard link LINK.TXT .
> 3  Open ORIG.TXT with MS Word.
> 4. DEL LINK.TXT
>    It returns error.
>=20
> Interesting thing is that you can delete link.txt if you open orig.txt wit=
h notepad.=20
> Notepad may close file after load, or it may be using different API.
>=20
> On 2012/03/15, at 5:04, Jim Newsham <jnewsham@referentia.com> wrote:
>=20
>>=20
>> Hi Maki,
>>=20
>> Thanks for the reply.  Yes, I understand that snapshots are hard links.  H=
owever, my understanding is that removing any hard-linked files just removes=
 the link (decrementing the link counter of the file on disk) -- it does not=
 delete the file itself nor remove any other links which may be pointing at t=
he file.  To confirm my understanding, I tested this in Windows by terminati=
ng Cassandra and then deleting all files in the snapshot dir.  None of the c=
orresponding files in the parent keyspace directory were removed.
>>=20
>> Regards,
>> Jim
>>=20
>> On 3/13/2012 9:29 PM, Maki Watanabe wrote:
>>> snapshot files are "hardlink"s of the original sstables.
>>> As you know, on windows, you can't delete files opened by other process.=

>>> If you try to delete the "hardlink", windows thinks you try to delete
>>> the sstables in production.
>>>=20
>>> maki
>>>=20
>>> 2012/3/14 Jim Newsham<jnewsham@referentia.com>:
>>>> Hi,
>>>>=20
>>>> I'm using Cassandra 1.0.8, on Windows 7.  When I take a snapshot of the=

>>>> database, I find that I am unable to delete the snapshot directory (i.e=
.,
>>>> dir named "{datadir}\{keyspacename}\snapshots\{snapshottag}") while
>>>> Cassandra is running:  "The action can't be completed because the folde=
r or
>>>> a file in it is open in another program.  Close the folder or file and t=
ry
>>>> again".  If I terminate Cassandra, then I can delete the directory with=
 no
>>>> problem.  Is there a reason why Cassandra must hold onto these files?
>>>>=20
>>>> Thanks,
>>>> Jim
>>>>=20
>>=20