Hi Manos,

 I think I might have added the getDataDir and getSNapdir later than 3.0.1.
So the patch would only apply to the trunk. Also the getdatadir is different
than the datadir that's used in purgetxnlog. Its a versioned directory
inside datadir (datadir/version-2 more specifically).


On 1/27/09 12:36 PM, "Manos Kapritsos" <ma...@cs.utexas.edu> wrote:

> Hi guys, I am working on implementing a Byzantine Fault Tolerant module
> on top of Zookeeper. As part of our work, we run experiments on the
> unmodified version of Zookeeper. We noticed yesterday that the
> PurgeTxnLog does not work properly, and were surprised to find that you
> noticed it at the same time! :) I tried to apply the latest patch that
> Mahadev posted, but it does not work properly. Most probably, I am
> missing something from the development. I applied the patch over version
> 3.0.1 and get the following compile errors:
> compile-main:
>     [javac] Compiling 3 source files to
> /home/manos/zookeeper-3.0.1_orig/build/classes
>     [javac] 
> /home/manos/zookeeper-3.0.1_orig/src/java/main/org/apache/zookeeper/server/Pur
> geTxnLog.java:98:
> cannot find symbol
>     [javac] symbol  : method getDataDir()
>     [javac] location: class
> org.apache.zookeeper.server.persistence.FileTxnSnapLog
>     [javac]      
> Arrays.asList(txnLog.getDataDir().listFiles(new MyFileFilter("log."))));
>     [javac]                                     ^
>     [javac] 
> /home/manos/zookeeper-3.0.1_orig/src/java/main/org/apache/zookeeper/server/Pur
> geTxnLog.java:100:
> cannot find symbol
>     [javac] symbol  : method getSnapDir()
>     [javac] location: class
> org.apache.zookeeper.server.persistence.FileTxnSnapLog
>     [javac]      
> files.addAll(Arrays.asList(txnLog.getSnapDir().listFiles(new
> MyFileFilter("snapshot."))));
>     [javac]                                          ^
>     [javac] 2 errors
> I checked and the txnLog (a FileTxnSnapLog object) does not have a
> getDataDir() method. The only getDataDir method is in ServerConfig,
> returning the static instance.dataDir string.
> The patch refers to revision 737951, so I guess these methods are
> already there in that revision. Is there any patch available that can be
> applied to 3.0.1 directly? If not, I can try and use the dataDir
> directly (but I guess there was a reason why it was changed).
> Thank you,
> Manos
> Mahadev konar (JIRA) wrote:
>>      [ 
>> https://issues.apache.org/jira/browse/ZOOKEEPER-252?page=com.atlassian.jira.p
>> lugin.system.issuetabpanels:all-tabpanel ]
>> Mahadev konar updated ZOOKEEPER-252:
>> ------------------------------------
>>     Attachment: ZOOKEEPER-252.patch
>> had a bug in the last patch.
>>> PurgeTxnLog is not handling the new dataDir directory structure
>>> ---------------------------------------------------------------
>>>                 Key: ZOOKEEPER-252
>>>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-252
>>>             Project: Zookeeper
>>>          Issue Type: Bug
>>>          Components: server
>>>    Affects Versions: 3.0.0, 3.0.1
>>>            Reporter: Patrick Hunt
>>>            Assignee: Mahadev konar
>>>            Priority: Critical
>>>             Fix For: 3.1.0
>>>         Attachments: ZOOKEEPER-252.patch
>>> org.apache.zookeeper.server.PurgeTxnLog class has not been updated to handle
>>> the new directory structure imposed by the upgrade from v2 to v3 of
>>> ZooKeeper. In particular the dataDir now has a "version-2" subdirectory that
>>> stores all of the snaps/transactionallogs for version2 of the persistence
>>> layer.
>>> I also note that the documentation of this class is particularly poor. I'm
>>> working on ZOOKEEPER-229 and would like to point to the API docs for this
>>> class regarding usage but they api docs are nonexistent
>>> Also - I think it's important for the user to be able to specify the number
>>> of "backup" snaps and logs that should be kept -- right now it seems we
>>> delete all but the current snaps/txlogs. Either by count or by date -- ie
>>> "remove anything 5 days or older, with a minum of 3 most recents snaps (and
>>> accompanying txlogs)" seems like a pretty common user case (assuming the
>>> operator is doing system backups every X days, etc...)
>>> in general this class needs some tlc - the formatting should also be cleaned
>>> up.
>>> Also - the API docs for this and LogFormatter are not included in the
>>> build.xml "javadoc" target. These are user utilities so javadoc for these
>>> two classes should be included. I will fix this issue as part of
>>> ZOOKEEPER-229. I'm also updateing the forrest documention in 229 so don't
>>> worry about that either.

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