skuehn@... 2011-12-20, 04:24
John W Vines 2011-12-20, 13:10
Adam Fuchs 2011-12-20, 18:50
Keith Turner 2011-12-20, 19:04
Clint Green 2011-12-20, 20:23
-Re: Recover from losing zookeeper data
skuehn@... 2011-12-20, 22:08
> When you say all local ZK storage was deleted, do you mean you lost all
> data in the version-2 directory, or deleted the zk ephemera?
Lost all data.
So I ended up just re-initializing Accumulo and re-ingesting data. Thanks
for the suggestions everyone. The is useful troubleshooting info to have
> If it's just the latter, than you may be able to roll-back to a earlier
> snapshot of your data.
> On Tue, Dec 20, 2011 at 2:04 PM, Keith Turner <[EMAIL PROTECTED]> wrote:
>> On Tue, Dec 20, 2011 at 1:50 PM, Adam Fuchs <[EMAIL PROTECTED]>
>> > I agree with John, but one caveat to his solution is that data you
>> > deleted could reappear through bulk loading files that are in the HDFS
>> > accumulo directory. This also implies that counts on aggregate tables
>> > be different after the operation. If your application is sensitive to
>> > things, then you might have to attempt to recreate the zookeeper data
>> > 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.