LockTimeoutException tries to promote a lock when you use a sequence?

Hi, I'm on I 5.0.73

I have 4 sons written to a database and each thread attempts to get a value of the same sequence. Falsely (as is the nature of these problems), I get a LockTimeoutException when the threads call com.sleepycat.je.Sequence.get(Sequence.java:341)

Here is the result of the Exception for threads 3 (the other does not throw an Exception and ends very well)

Thread "TradeWriter-1":

com.sleepycat.je.LockTimeoutException: (I 5.0.73) lock has expired. Locker 1163009300 3095544_TradeWriter-1_Txn: waited for lock on the database = sequences LockAddr:130120503 LSN = 0 x 67/0x565e32 type = WRITING grant = WAIT_PROMOTION timeoutMillis = 10000 startTime = endTime 1385946530364 = 1385946540364

Owners: [< LockInfo locker = '1958359210 3095546_TradeWriter-3_Txn' type = 'READ' / >, < LockInfo locker = "1163009300 3095544_TradeWriter-1_Txn" type = "READ" / >, < LockInfo locker = '301150106 3095545_TradeWriter-2_Txn' type = 'READ' / >]

[Server:]

1163009300 3095544_TradeWriter-1_Txn transaction has LockAddr:130120503 < LockInfo locker = '1163009300 3095544_TradeWriter-1_Txn' type = 'READ' / >

Transaction 1163009300 3095544_TradeWriter 1_Txn waiting LockAddr:130120503

"TradeWriter-0": vicryl

com.sleepycat.je.LockTimeoutException: (I 5.0.73) lock has expired. Locker 1087485625 3095549_TradeWriter-0_Txn: waited for lock on the database = sequences LockAddr:130120503 LSN = 0 x 67/0x565e32 type = WRITING grant = WAIT_NEW timeoutMillis = 10000 startTime = endTime 1385946540366 = 1385946550367

Owners: [< LockInfo locker = "1958359210 3095546_TradeWriter-3_Txn" type = "READ" / >, < LockInfo locker = '301150106 3095545_TradeWriter-2_Txn' type = 'READ' / >]

[Server:]

"TradeWriter-3: wire

com.sleepycat.je.LockTimeoutException: (I 5.0.73) lock has expired. Locker 1958359210 3095546_TradeWriter-3_Txn: waited for lock on the database = sequences LockAddr:130120503 LSN = 0 x 67/0x565e32 type = WRITING grant = WAIT_PROMOTION timeoutMillis = 10000 startTime = endTime 1385946550368 = 1385946560368

Owners: [< LockInfo locker = "1958359210 3095546_TradeWriter-3_Txn" type = "READ" / >, < LockInfo locker = '301150106 3095545_TradeWriter-2_Txn' type = 'READ' / >]

[Server:]

1958359210 3095546_TradeWriter-3_Txn transaction has LockAddr:130120503 < LockInfo locker = '1958359210 3095546_TradeWriter-3_Txn' type = 'READ' / >

Transaction 1958359210 3095546_TradeWriter 3_Txn waiting LockAddr:130120503

If my interpretation is correct, it seems that two threads try to promote a read to a write lock lock, which they cannot do because the other thread is read, and this results in a deadlock. Is this correct? If so, how can this be avoided? Exception for three threads stack trace is exactly the same. This is the upper part of it:

to com.sleepycat.je.txn.LockManager.newLockTimeoutException(LockManager.java:664) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.txn.LockManager.makeTimeoutMsgInternal(LockManager.java:623) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.txn.SyncedLockManager.makeTimeoutMsg(SyncedLockManager.java:97) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.txn.LockManager.lockInternal(LockManager.java:390) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.txn.LockManager.lock(LockManager.java:276) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.txn.Txn.lockInternal(Txn.java:498) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.txn.Locker.lock(Locker.java:443) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.dbi.CursorImpl.lockLN(CursorImpl.java:2621) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.dbi.CursorImpl.lockLN(CursorImpl.java:2422) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.dbi.CursorImpl.searchAndPosition(CursorImpl.java:2150) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Cursor.searchInternal(Cursor.java:2666) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Cursor.searchAllowPhantoms(Cursor.java:2576) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Cursor.searchNoDups(Cursor.java:2430) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Cursor.search(Cursor.java:2397) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Cursor.getSearchKey(Cursor.java:1668) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Sequence.readData(Sequence.java:542) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Sequence.readDataRequired(Sequence.java:527) ~[je-5.0.73.jar:5.0.73]

to com.sleepycat.je.Sequence.get(Sequence.java:341) ~[je-5.0.73.jar:5.0.73]

Uses internally a LockMode.RMW sequence during playback to avoid promotion locking issues, if it is not.  Looks like you're passing a transaction to Sequence.get, that holds the lock until you commit the transaction.  I suspect that you use this operation to other operations, and it may be deadlock prone.

Although Sequence.get allows passing a transaction for ultimate flexibility, normally it is not a good idea and has little benefit.  Instead, pass NULL to use automatic update of sequence validation, or use another transaction to update the sequence.  If your transaction user abandons, the sequence will not be cancelled, but is normally not a drawback - it only means that, in this rare case, some sequence values will be unused.

If the reason for which you pass a transaction durability or use a specific TransactionConfig, then create a transaction just for this go to Sequence.get and validate immediately thereafter.  Or, if you simply want sustainability NO_SYNC, open the sequence as a nontransactional data base database and pass NULL for the transaction parameter.  This latter approach is what I recommend, assuming that you do not use HA to replicate the sequence database (in which case it must be transactional type).

-mark

Tags: Database

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