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From Clint Green <clintonrgr...@gmail.com>
Subject Re: Recover from losing zookeeper data
Date Tue, 20 Dec 2011 20:23:43 GMT
When you say all local ZK storage was deleted, do you mean you lost all the
data in the version-2 directory, or deleted the zk ephemera?

If it's just the latter, than you may be able to roll-back to a earlier
snapshot of your data.

Clint

On Tue, Dec 20, 2011 at 2:04 PM, Keith Turner <keith@deenlo.com> wrote:

> On Tue, Dec 20, 2011 at 1:50 PM, Adam Fuchs <adam.p.fuchs@ugov.gov> wrote:
> > I agree with John, but one caveat to his solution is that data you have
> > deleted could reappear through bulk loading files that are in the HDFS
> > accumulo directory. This also implies that counts on aggregate tables
> could
> > be different after the operation. If your application is sensitive to
> these
> > things, then you might have to attempt to recreate the zookeeper data by
> > hand (or just start from scratch).
> >
> > Adam
> >
>
> What John proposed is the simplest solution.  Zookeeper holds table
> name to table id map, table configuration, user information, and
> information about the root tablet.  The most important info that it
> contains w/ regards to actual data in accumulo is the write ahead logs
> for the root tablet.  Except for the root table write ahead logs, the
> !METADATA table is all on hdfs.  The !METADATA table contains all the
> information about which tables use which files.  This information is
> important for avoiding the problem that Adam mentioned.
>

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