My own experiments in my own environment where ZK is being used purely for
coordination at a fairly low transaction rate (tens to hundreds of ops per
second, mostly status updates) made me feel that disk throughput would only
be detectable as an issue for pretty massively abused ZK applications. T
i did a benchmark a while back to see the effect of turning off the
disk. (it wasn't as big as you would think.) i had to modify the code.
there is an option to turn off the sync in the config that will get you
most of the performance you would get by turning off the disk entirely.
ben
On 07/
Not having a datadir is currently not possible - the servers expect to
read/write snapshot and log files. In particular the leader needs to be
able to stream updates, and in some cases the entire latest snapshot, to
a follower. It does this by streaming data directly from the filesystem.
Patri
rum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:108)
at
org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:76)
Ashwin.
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s can sync directly from
> senior
> > servers without relying on log files. In that case, I'm curious to see
> what
> > happens if you just redirect log files to /dev/null. Anyone tried this?
> >
> > Regards,
> > Ashwin Jayaprakash.
>
>
>
> ---
Hi Ashwin,
We have seen people wanting to have something like ZooKeeper without the
reliability of permanent storage and are willing to work with loosened
guarantees of current Zookeeper. What you mention on log files is certainly
a valid use case.
It would be great to see how much throughput yo
They don't auto-detect.
What is usually done is that the configurations on all the servers are
changed and they are re-started one at a time.
On Mon, Jul 19, 2010 at 8:35 PM, Ashwin Jayaprakash <
ashwin.jayaprak...@gmail.com> wrote:
> So, what happens
> when a new replacement server has to be br
eeper-user.578899.n2.nabble.com/ZK-recovery-questions-tp5310116p5315123.html
Sent from the zookeeper-user mailing list archive at Nabble.com.
On Sun, Jul 18, 2010 at 3:34 PM, Ashwin Jayaprakash <
ashwin.jayaprak...@gmail.com> wrote:
>
> - If 1 out of 3 servers crashes and the log files are unrecoverable, how
> do we provision a replacement server?
>
Just start it and it will download a snapshot from the other servers.
>
>- If
Hi, I've been reading the docs and trying out some basic Zookeeper examples.
I have a few simple questions related to recovery.
It would be good to have questions like these on the Wiki/docs to avoid
noobs like me asking the same thing over and over.
- If 1 out of 3 servers crashes and the lo
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