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MapDB is being used in a phrase matching application, being tested as a replacement for JDBM3. JDMB3 operates efficiently and correctly with this application. MapDB, on the other hand, fails when writing updated records with the same application and the same data. MapDB fails with different entries on each trial. The only DBMaker functions used are closeOnJvmShutdown() and make(). The cacheDisable() and asyncWriteDisable() options do allow the application to work albeit very slowly in comparison with JDBM3.

This is being tested on an Apple MacPro laptop with fast solid-state drives (SSDs).

The application is written in Jython and here is the traceback for the error in question:

"Traceback (most recent call last):
File "IesSeqDict.py", line 335, in
sys.stderr.write('%d ms\n' % timeIt(test0))
File "/Users/infoextract/work/seq-dict/IesCore.py", line 52, in timeIt
func()
File "IesSeqDict.py", line 330, in test0
isd.set(lines[i][0].split(' '),lines[i][1])
File "/Users/infoextract/work/seq-dict/IesSeqDict.py", line 198, in set
self.LENGTHS[lcaseFirstToken] = keyllen
File "/Users/infoextract/work/seq-dict/IesMapDB.py", line 270, in setitem
return self.treeMap.put(key,value)
at org.mapdb.AsyncWriteEngine.recordPut(AsyncWriteEngine.java:190)
at org.mapdb.CacheHashTable.recordPut(CacheHashTable.java:65)
at org.mapdb.BTreeMap.put2(BTreeMap.java:589)
at org.mapdb.BTreeMap.put(BTreeMap.java:457)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)

java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: an error in writter thread"

I can provide the code (Jython application, supporting Jython utility libraries) and data (approx. 750K medical expressions and associated categories) to you separately, at your request.

Win Carus ([email protected])