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Zookeeper >> mail # dev >> Dumping and loading Zookeeper data


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Dumping and loading Zookeeper data
Hi,

I've been looking at a few options for dumping and loading Zookeeper data.
If anyone here can provide insight on the current state of tools and what I
should use, that would be great.

First, I tried zktreeutil from the zookeeper-bin (3.4.5) package:
zktreeutil -z localhost:2181 -E

I can connect to that address using telnet and another zookeeper dumping
tool
(guano), but zktreeutil gives me:

[zktreeutil] zooKeeper exception caught: Unable to connect to ZK running at
'localhost:2181'; state=999
terminate called after throwing an instance of '2013-05-01
10:55:38,990:18626(0x7f7240369700):ZOO_INFO@check_events@1703: initiated
connection to server [127.0.0.1:2181]
zktreeutil::ZooKeeperException'
  what():  Unable to connect to ZK running at 'localhost:2181'; state=999
Aborted (core dumped)

The above is running Ubuntu 12.04.1 LTS (Precise).

I noticed that there were several patches submitted to zktree-util ([1] and
[2]), but it seems none of them have been accepted - is the tool deprecated?

I then tried guano [3]. This tool dumped the zookeeper data to a folder
structure rather than XML, but it did seem to work. If I don't find other
options, I'll go with this, but since it's outside zookeeper core and was
last updated 10 months ago, I wasn't sure about it.

At StackOverflow [4], someone mentioned zkConfig.py, a "contributed project
when you install zookeeper", but I can't seem to find it in the current
code.
I did find zk_dump_tree.py in the current source code checkout, but it
seems
to use a separate REST server, which doesn't seem ideal.

That's as far as I've gotten in my investigation - kind of a confusing
picture, so any insights appreciated!

Thanks,
Dave.

[1] ZOOKEEPER-1218, Apr 2012 -
https://issues.apache.org/jira/browse/ZOOKEEPER-1218
[2] ZOOKEEPER-1445, May 2012 -
https://issues.apache.org/jira/browse/ZOOKEEPER-1445
[3] https://github.com/dietrichf/guano
[4] http://stackoverflow.com/questions/6394140/how-do-you-backup-zookeeper