dlmarion opened a new pull request, #6470:
URL: https://github.com/apache/accumulo/pull/6470
Looking at the non-deterministic failures of SessionBlockVerifyIT I found a
deadlock between the ClientContext.close and TabletLocator.getLocator methods
when there are unclosed Scanners in the client.
JStack found the deadlock at:
```
Java stack information for the threads listed above:
===================================================
"junit-timeout-thread-4":
at
org.apache.accumulo.core.clientImpl.TabletLocator.disable(TabletLocator.java:134)
- waiting to lock <0x000000042dbf08e8> (a java.lang.Class for
org.apache.accumulo.core.clientImpl.TabletLocator) at
-
org.apache.accumulo.core.clientImpl.TabletLocator$1.disable(TabletLocator.java:245)
at
-
org.apache.accumulo.core.singletons.SingletonManager.disable(SingletonManager.java:106)
at
-
org.apache.accumulo.core.singletons.SingletonManager$$Lambda/0x00007fbd94325f88.accept(Unknown
Source) at
- java.util.ArrayList.forEach([email protected]/ArrayList.java:1596) at
-
org.apache.accumulo.core.singletons.SingletonManager.transition(SingletonManager.java:196)
at
-
org.apache.accumulo.core.singletons.SingletonManager.releaseReservation(SingletonManager.java:145)
- locked <0x000000042dcc4b68> (a java.lang.Class for
org.apache.accumulo.core.singletons.SingletonManager) at
-
org.apache.accumulo.core.singletons.SingletonReservation.close(SingletonReservation.java:50)
at
-
org.apache.accumulo.core.clientImpl.ClientContext.close(ClientContext.java:894)
- locked <0x000000042d857668> (a
org.apache.accumulo.core.clientImpl.ClientContext) at
-
org.apache.accumulo.test.functional.SessionBlockVerifyIT.run(SessionBlockVerifyIT.java:179)
"pool-2-thread-5":
at
org.apache.accumulo.core.clientImpl.ClientContext.tableZooHelper(ClientContext.java:626)
- waiting to lock <0x000000042d857668> (a
org.apache.accumulo.core.clientImpl.ClientContext) at
-
org.apache.accumulo.core.clientImpl.ClientContext.getTableState(ClientContext.java:671)
at
-
org.apache.accumulo.core.clientImpl.TabletLocator.getLocator(TabletLocator.java:148)
- locked <0x000000042dbf08e8> (a java.lang.Class for
org.apache.accumulo.core.clientImpl.TabletLocator) at
-
org.apache.accumulo.core.clientImpl.ThriftScanner.scan(ThriftScanner.java:518)
at
-
org.apache.accumulo.core.clientImpl.ScannerIterator.readBatch(ScannerIterator.java:159)
- locked <0x000000042d863fb8> (a
org.apache.accumulo.core.clientImpl.ThriftScanner$ScanState) at
-
org.apache.accumulo.core.clientImpl.ScannerIterator.getNextBatch(ScannerIterator.java:177)
at
-
org.apache.accumulo.core.clientImpl.ScannerIterator.hasNext(ScannerIterator.java:109)
at
-
org.apache.accumulo.test.functional.SessionBlockVerifyIT.lambda$0(SessionBlockVerifyIT.java:122)
at
-
org.apache.accumulo.test.functional.SessionBlockVerifyIT$$Lambda/0x00007fbd943acba8.call(Unknown
Source)
```
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