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Posted to dev@ignite.apache.org by "Stepachev Maksim (Jira)" <ji...@apache.org> on 2020/08/14 08:46:00 UTC
[jira] [Created] (IGNITE-13363) GridDhtCacheEntry::toString locks
Stepachev Maksim created IGNITE-13363:
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Summary: GridDhtCacheEntry::toString locks
Key: IGNITE-13363
URL: https://issues.apache.org/jira/browse/IGNITE-13363
Project: Ignite
Issue Type: Bug
Components: networking
Affects Versions: 2.8.1
Reporter: Stepachev Maksim
Assignee: Stepachev Maksim
Fix For: 3.0
`GridDhtCacheEntry::toString` locks the entry which may lead to dead locks and, I assume, even performance issues.
We, naturally, call `toString` on everything all the time and it needs to be the safest and the lightest possible operation.
Example of a hang with locking toString:
{{Thread [name="grid-timeout-worker-#71%GRIDC1%", id=98, state=WAITING, blockCnt=2, waitCnt=14196]
Lock [object=java.util.concurrent.locks.ReentrantLock$NonfairSync@20c96143, ownerName=exchange-worker-#188%GRIDC1%, ownerId=265]
at java.base@11.0.2/jdk.internal.misc.Unsafe.park(Native Method)
at java.base@11.0.2/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
at java.base@11.0.2/java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:885)
at java.base@11.0.2/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:917)
at java.base@11.0.2/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1240)
at java.base@11.0.2/java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:267)
at app//o.a.i.i.processors.cache.GridCacheMapEntry.lockEntry(GridCacheMapEntry.java:5051)
at app//o.a.i.i.processors.cache.distributed.dht.GridDhtCacheEntry.toString(GridDhtCacheEntry.java:819)
at java.base@11.0.2/java.lang.String.valueOf(String.java:2951)
at app//o.a.i.i.util.GridStringBuilder.a(GridStringBuilder.java:101)
at app//o.a.i.i.util.tostring.SBLimitedLength.a(SBLimitedLength.java:88)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:939)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toStringImpl(GridToStringBuilder.java:1005)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:826)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:783)
at app//o.a.i.i.processors.cache.transactions.IgniteTxEntry.toString(IgniteTxEntry.java:1273)
at java.base@11.0.2/java.lang.String.valueOf(String.java:2951)
at java.base@11.0.2/java.lang.StringBuilder.append(StringBuilder.java:168)
at java.base@11.0.2/java.util.AbstractCollection.toString(AbstractCollection.java:473)
at java.base@11.0.2/java.lang.String.valueOf(String.java:2951)
at app//o.a.i.i.util.GridStringBuilder.a(GridStringBuilder.java:101)
at app//o.a.i.i.util.tostring.SBLimitedLength.a(SBLimitedLength.java:88)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:939)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toStringImpl(GridToStringBuilder.java:1005)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:826)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:783)
at app//o.a.i.i.processors.cache.distributed.GridDistributedTxMapping.toString(GridDistributedTxMapping.java:319)
at java.base@11.0.2/java.lang.String.valueOf(String.java:2951)
at app//o.a.i.i.util.GridStringBuilder.a(GridStringBuilder.java:101)
at app//o.a.i.i.util.tostring.SBLimitedLength.a(SBLimitedLength.java:88)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:939)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toStringImpl(GridToStringBuilder.java:1005)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:864)
at app//o.a.i.i.processors.cache.distributed.near.IgniteTxMappingsSingleImpl.toString(IgniteTxMappingsSingleImpl.java:99)
at java.base@11.0.2/java.lang.String.valueOf(String.java:2951)
at app//o.a.i.i.util.GridStringBuilder.a(GridStringBuilder.java:101)
at app//o.a.i.i.util.tostring.SBLimitedLength.a(SBLimitedLength.java:88)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:939)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toStringImpl(GridToStringBuilder.java:1005)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:685)
at app//o.a.i.i.util.tostring.GridToStringBuilder.toString(GridToStringBuilder.java:621)
at app//o.a.i.i.processors.cache.distributed.near.GridNearTxLocal.toString(GridNearTxLocal.java:4845)
at java.base@11.0.2/java.lang.String.valueOf(String.java:2951)
at java.base@11.0.2/java.lang.StringBuilder.append(StringBuilder.java:168)
at app//o.a.i.i.processors.cache.GridCachePartitionExchangeManager.dumpLongRunningOperations0(GridCachePartitionExchangeManager.java:1941)
at app//o.a.i.i.processors.cache.GridCachePartitionExchangeManager.dumpLongRunningOperations(GridCachePartitionExchangeManager.java:2002)
at app//o.a.i.i.IgniteKernal$4.run(IgniteKernal.java:1269)
at app//o.a.i.i.processors.timeout.GridTimeoutProcessor$CancelableTask.onTimeout(GridTimeoutProcessor.java:365)
- locked o.a.i.i.processors.timeout.GridTimeoutProcessor$CancelableTask@11035ab0
at app//o.a.i.i.processors.timeout.GridTimeoutProcessor$TimeoutWorker.body(GridTimeoutProcessor.java:234)
at app//o.a.i.i.util.worker.GridWorker.run(GridWorker.java:120)
at java.base@11.0.2/java.lang.Thread.run(Thread.java:834)}}
Here the timeout worker attempted to print long running operations and hanged because the other threads held the locks on the entries (which is what you would expect from a "long running operations" situtation).
{quote}Let's remove the locking from this toString (and possibly cleanup more toString implementations) and only print the information we don't need for.
A separate method, like `describeEntry` can be added to obtain a full description under a lock, if it is ever needed somewhere.
{quote}
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