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Date: Fri, 18 Mar 2016 16:38:28 +0000
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Subject: Re: Dealing with old delivered requests in memory
From: ibrahim El-sanosi <ibrahimsabattt@gmail.com>
To: user@zookeeper.apache.org
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Thank you for replaying.


Take this example, Zookeeper started on 1/1/2015, and assume ZK servers are
never crashed. Also, the ZK are very busy, reciveing continusly write
requests from clients and accordingly snapshots are generated overtime. On
1/3/2015, what  Znodes will be in memory data tree? do all Znodes still
store in memory (from 1/1/2015 to 1/3/2015) as there is no crashed occur.
Or Dsnapshhot is taken the data tree is


Note that  I am not asking about data in log or snapshoot. I am asking
about the current data in memory.

On Fri, Mar 18, 2016 at 4:12 PM, Flavio Junqueira <fpj@apache.org> wrote:

> Hi Ibrahim,
>
> Are you asking about how we compact old logs? We do it by taking snapshots
> so that upon recovery, we only load the latest snapshot and replay the txn
> log from the snapshot tag. The snapshot tag is the last zxid committed when
> we start producing the snapshot.
>
> We don't actually delete anything, though, unless you intentionally turn
> on auto purge:
>
> https://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html#sc_administering
> <
> https://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html#sc_administering
> >
>
> -Flavio
>
> > On 18 Mar 2016, at 16:05, ibrahim El-sanosi <ibrahimsabattt@gmail.com>
> wrote:
> >
> > Hi all,
> >
> > Assume the Zookeeper have been running for about one year (from 1/1/2015
> > until now), how does ZooKeeper deal with old delivered write requests (To
> > optimize a memory used) (say from 1/1/2015 to 03/04/2015). I am assuming
> > the old delivered request are no longer used.
> >
> > On the other words, what strategy ZK does to find and delete unused
> Znodes?
> >
> >  Ibrahim
>
>

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