How to verify hint file checksum

[Shishir Kumar <sh...@gmail.com>]

Hi,

Is there any CLI or API which I can use to validate hint files checksum is
correct?

Reason to ask for such utility/CLI - We are doing rolling upgrade for
Cassandra in Google cloud. As approach we bring down nodes, take snapshot
backup, upgrade and bring node up. During this process hint file also gets
backed up. At times few hint file write is in transit while we are doing
snapshot backup. This result in server start up failure as hint file
checksum do not match.

So I am looking for a way which confirm no hint file write in transit
during snapshot backup. In case we have any CLI or API which can confirm
hint file checksum is good, it will serve purpose.

Regards
Shishir

Re: How to verify hint file checksum

[Shishir Kumar <sh...@gmail.com>]

Since we take backup and upgrade so multiple rsync do not seem option.

Where to file JIRA to get this util build?
I can attempt building tool myself but need pointer for Checksum generator
class reference which read hints file and generate/update crc file hint
digest.

Regards
Shishir

On Thu, 26 Sep 2019, 19:55 Jeff Jirsa, <jj...@gmail.com> wrote:

>
>
> No mechanism exists. You could potentially do multiple rsyncs instead of
> trying to grab a live file one time, but it’s also worth a JIRA to build a
> utility that tries to validate the checksum (it won’t be difficult)
>
> On Sep 26, 2019, at 6:37 AM, Shishir Kumar <sh...@gmail.com>
> wrote:
>
> 
> Hi,
>
> Is there any CLI or API which I can use to validate hint files checksum is
> correct?
>
> Reason to ask for such utility/CLI - We are doing rolling upgrade for
> Cassandra in Google cloud. As approach we bring down nodes, take snapshot
> backup, upgrade and bring node up. During this process hint file also gets
> backed up. At times few hint file write is in transit while we are doing
> snapshot backup. This result in server start up failure as hint file
> checksum do not match.
>
> So I am looking for a way which confirm no hint file write in transit
> during snapshot backup. In case we have any CLI or API which can confirm
> hint file checksum is good, it will serve purpose.
>
> Regards
> Shishir
>
>

Re: How to verify hint file checksum

[Jeff Jirsa <jj...@gmail.com>]

No mechanism exists. You could potentially do multiple rsyncs instead of trying to grab a live file one time, but it’s also worth a JIRA to build a utility that tries to validate the checksum (it won’t be difficult)

> On Sep 26, 2019, at 6:37 AM, Shishir Kumar <sh...@gmail.com> wrote:
> 
> 
> Hi,
> 
> Is there any CLI or API which I can use to validate hint files checksum is correct?
> 
> Reason to ask for such utility/CLI - We are doing rolling upgrade for Cassandra in Google cloud. As approach we bring down nodes, take snapshot backup, upgrade and bring node up. During this process hint file also gets backed up. At times few hint file write is in transit while we are doing snapshot backup. This result in server start up failure as hint file checksum do not match.
> 
> So I am looking for a way which confirm no hint file write in transit during snapshot backup. In case we have any CLI or API which can confirm hint file checksum is good, it will serve purpose.
> 
> Regards 
> Shishir 
>