java.io.IOError: java.io.IOException: Zero Header, data corrupted

[fabiankessler]

Using MapDB 1.0.7
Windows 8.1 64bit
Disk=SSD

I work with a map that I get with map = db.getTreeMap(identifier) and then commit after every modification in map with db.commit();

I was running the program in the IDE (IntelliJ). Then IntelliJ itself run out of memory in another project, and closed (killed) all windows. Now the mapdb data is broken.

The exception happens when accessing the map. Deleting the .t file did not help.
The broken database is available here: https://mega.co.nz/#!CkokVD5Q!rQMQZ7-NUjqjvaczr49euPIQm164pvnMnsruRWYraQw

[fabiankessler]

Exception in thread "main" java.io.IOError: java.io.IOException: Zero Header, data corrupted
at org.mapdb.SerializerBase.deserialize(SerializerBase.java:881)
at org.mapdb.SerializerBase.deserialize(SerializerBase.java:867)
at org.mapdb.SerializerPojo.deserialize(SerializerPojo.java:701)
at org.mapdb.BTreeKeySerializer$BasicKeySerializer.deserialize(BTreeKeySerializer.java:89)
at org.mapdb.BTreeMap$NodeSerializer.deserialize(BTreeMap.java:440)
at org.mapdb.BTreeMap$NodeSerializer.deserialize(BTreeMap.java:288)
at org.mapdb.Store.deserialize(Store.java:297)
at org.mapdb.StoreDirect.get2(StoreDirect.java:475)
at org.mapdb.StoreWAL.get2(StoreWAL.java:336)
at org.mapdb.StoreWAL.get(StoreWAL.java:320)
at org.mapdb.Caches$HashTable.get(Caches.java:246)
at org.mapdb.EngineWrapper.get(EngineWrapper.java:58)
at org.mapdb.BTreeMap$BTreeIterator.advance(BTreeMap.java:924)
at org.mapdb.BTreeMap$BTreeValueIterator.next(BTreeMap.java:1066)
at (my code).printStats(Words.java:129)
at (my code).printStats(SingleTypeWordsData.java:53)
at (my code)DiscoveryApp.(DiscoveryApp.java:44)
at (my code)App.(App.java:34)
at (my code)App.main(App.java:44)
Caused by: java.io.IOException: Zero Header, data corrupted
... 19 more

[jankotek]

I tried to investigate. Name Catalog is corrupted, some values are set to zeroes. Closing this bug, since I see no chance to find what caused the issue.

[avishayh]

happened to me as well, same exception when using database.getHashMap(id)>
each method I try operating on this id returns an exception in the deserialize method.
Is there any way to fix this corruption and still use the DB ?
other records (diffrent id's for getHashMap) on the DB are working properly , I would like to call a delete(id) on this record and loose only this record and not loose all the DB instance.
but delete method also throws the same exception.

[jankotek]

It should be fixable by removing write ahead log (*.t) files

[avishayh]

Still get the broken record.

will it be possible to have a way in the code to bypass the corrupted data once happens, so the application can "fix" it self without system fix/interference.