Hi,
I've managed to deadlock the MVStore:
"MVStore background writer
nio:/mnt/COMPUTE/scratch/b/db-builder/target/large-demo-1.1.data/mv-store/mv-store.mv":
at org.h2.mvstore.MVStore.commitAndSave(MVStore.java:983)
- waiting to lock <0x00000003d5f4f7b8> (a org.h2.mvstore.MVStore)
at org.h2.mvstore.MVStore.beforeWrite(MVStore.java:2205)
at org.h2.mvstore.MVMap.beforeWrite(MVMap.java:1008)
at org.h2.mvstore.MVMap.put(MVMap.java:120)
- locked <0x00000003d9f5fde8> (a org.h2.mvstore.MVMap)
at org.h2.mvstore.MVMap.replace(MVMap.java:578)
- locked <0x00000003d9f5fde8> (a org.h2.mvstore.MVMap)
at org.h2.mvstore.MVMap.rewrite(MVMap.java:768)
at org.h2.mvstore.MVMap.rewrite(MVMap.java:785)
at org.h2.mvstore.MVMap.rewrite(MVMap.java:785)
at org.h2.mvstore.MVMap.rewrite(MVMap.java:744)
at org.h2.mvstore.MVStore.compactRewrite(MVStore.java:1902)
at org.h2.mvstore.MVStore.compact(MVStore.java:1784)
- locked <0x00000003d6539b10> (a java.lang.Object)
at org.h2.mvstore.MVStore.writeInBackground(MVStore.java:2495)
at
org.h2.mvstore.MVStore$BackgroundWriterThread.run(MVStore.java:2713)
"ISAAC-Q-work-thread 33":
at org.h2.mvstore.MVMap.put(MVMap.java:119)
- waiting to lock <0x00000003d9f5fde8> (a org.h2.mvstore.MVMap)
at org.h2.mvstore.MVStore.compactRewriteFully(MVStore.java:1584)
- locked <0x00000003d5f4f7b8> (a org.h2.mvstore.MVStore)
at
sh.isaac.provider.mvStore.MVDataStoreProvider.compact(MVDataStoreProvider.java:762)
at
sh.isaac.provider.datastore.DatastoreLocator.compact(DatastoreLocator.java:399)
>From my logging and the code traces, I believe these are the only calls
involved:
store.commit();
try
{
store.getFileStore().getFile().force(true); //make sure everything is
synced to disk, before we start our compact sequence
}
catch (IOException e)
{
LOG.error("Unexpected:", e);
}
store.compactRewriteFully();
What can I do to prevent this from happening? Do you want me to file a bug
report? I would have thought that committing and flushing would have also
flushed the background writer... but apparently not... is there some way to
sync and flush the background writer?
Thanks,
Dan
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