Is it safe to replace master.db file?

[Sudheer Kumar <su...@gmail.com>]

Hi,

I am using ApacheDs 1.5.4, after running successfully for a long time, now
getting the following error:

Exception in thread "main" java.lang.NullPointerException
        at org.apache.directory.server.core.entry.ClonedServerEntry.<init>
        (ClonedServerEntry.java:67)
        at

org.apache.directory.server.core.partition.impl.btree.jdbm.JdbmPartition.lookup
(JdbmPartition.java:457)
        at

org.apache.directory.server.core.partition.impl.btree.ServerEntryCursorAdaptor.get
(ServerEntryCursorAdaptor.java:140)
        at

org.apache.directory.server.core.partition.impl.btree.ServerEntryCursorAdaptor.get
(ServerEntryCursorAdaptor.java:40)
        at

org.apache.directory.server.core.filtering.BaseEntryFilteringCursor.next
(BaseEntryFilteringCursor.java:502)
        at org.apache.directory.server.core.authz.GroupCache.initialize
        (GroupCache.java:151)
        at org.apache.directory.server.core.authz.GroupCache.<init>
        (GroupCache.java:115)
        at

org.apache.directory.server.core.authz.AciAuthorizationInterceptor.init
(AciAuthorizationInterceptor.java:211)
        at

org.apache.directory.server.core.interceptor.InterceptorChain.register0
(InterceptorChain.java:439)
        at

org.apache.directory.server.core.interceptor.InterceptorChain.register
(InterceptorChain.java:395)
        at
        org.apache.directory.server.core.interceptor.InterceptorChain.init
        (InterceptorChain.java:255)
        at
        org.apache.directory.server.core.DefaultDirectoryService.initialize
        (DefaultDirectoryService.java:1385)
        at org.apache.directory.server.core.DefaultDirectoryService.startup
        (DefaultDirectoryService.java:840)
        at org.apache.directory.server.configuration.ApacheDS.startup
        (ApacheDS.java:126)
        at org.apache.directory.server.Service.init(Service.java:86)
        at org.apache.directory.server.UberjarMain.main
        (UberjarMain.java:56)


-----------
what I found is that, the master.db file (in <partition>/system)got
corrupted somehow and which is causing this error and not able to start the
server.  So I just replaced the master.db from a fresh installation and it
worked.  So my question is, is it okay to replace the master.db file as a
workaround?  will it cause any data loss? What does it contain?  Please
explain.

-- 
Sudheer Kumar Arimbra

Re: Is it safe to replace master.db file?

[Emmanuel Lecharny <el...@gmail.com>]

On 6/8/10 11:43 AM, Sudheer Kumar wrote:
> Hi,
>
> I am using ApacheDs 1.5.4, after running successfully for a long time, now
> getting the following error:
> <snip/>
>
> -----------
> what I found is that, the master.db file (in<partition>/system)got
> corrupted somehow and which is causing this error and not able to start the
> server.  So I just replaced the master.db from a fresh installation and it
> worked.  So my question is, is it okay to replace the master.db file as a
> workaround?  will it cause any data loss? What does it contain?  Please
> explain.
>    
The master.db file contains *all* the entries. Replacing it is nt an 
issue as soon as you don't care to lose everything. And if you remove 
it, you also have to remove all the index, because they are pointing on 
nothing.

With 1.5.4, the only solution is to remove the master.db and all the 
index, then to inject all the entries back.

We are working on a recovery system for the coming 2.0 version, with a 
tool to rebuild the index, assuming the master table is safe, and a 
journal to reinject all the modifications if the server has crashed.


-- 
Regards,
Cordialement,
Emmanuel Lécharny
www.nextury.com