Reduce deadlock probability of ClientContext.close / TabletLocator.getLocator#6470
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Reduce deadlock probability of ClientContext.close / TabletLocator.getLocator#6470dlmarion wants to merge 1 commit into
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…deadlock Looking at the non-deterministic failures of SessionBlockVerifyIT I found a deadlock between the ClientContext.close and TabletLocator.getLocator methods where 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$$Lambda/0x00007fbd94325f88.accept(Unknown Source) at java.util.ArrayList.forEach(java.base@21.0.11/ArrayList.java:1596) at org.apache.accumulo.core.singletons.SingletonManager.transition(SingletonManager.java:196) at org.apache.accumulo.core.singletons.SingletonManager.releaseReservation(SingletonManager.java:145) - locked <0x000000042dcc4b68> (a java.lang.Class for org.apache.accumulo.core.singletons.SingletonManager) at org.apache.accumulo.core.singletons.SingletonReservation.close(SingletonReservation.java:50) at org.apache.accumulo.core.clientImpl.ClientContext.close(ClientContext.java:894) - locked <0x000000042d857668> (a org.apache.accumulo.core.clientImpl.ClientContext) at org.apache.accumulo.test.functional.SessionBlockVerifyIT.run(SessionBlockVerifyIT.java:179) "pool-2-thread-5": at org.apache.accumulo.core.clientImpl.ClientContext.tableZooHelper(ClientContext.java:626) - waiting to lock <0x000000042d857668> (a org.apache.accumulo.core.clientImpl.ClientContext) at org.apache.accumulo.core.clientImpl.ClientContext.getTableState(ClientContext.java:671) at org.apache.accumulo.core.clientImpl.TabletLocator.getLocator(TabletLocator.java:148) - locked <0x000000042dbf08e8> (a java.lang.Class for org.apache.accumulo.core.clientImpl.TabletLocator) at org.apache.accumulo.core.clientImpl.ThriftScanner.scan(ThriftScanner.java:518) at org.apache.accumulo.core.clientImpl.ScannerIterator.readBatch(ScannerIterator.java:159) - locked <0x000000042d863fb8> (a org.apache.accumulo.core.clientImpl.ThriftScanner$ScanState) at org.apache.accumulo.core.clientImpl.ScannerIterator.getNextBatch(ScannerIterator.java:177) at org.apache.accumulo.core.clientImpl.ScannerIterator.hasNext(ScannerIterator.java:109) at org.apache.accumulo.test.functional.SessionBlockVerifyIT.lambda$0(SessionBlockVerifyIT.java:122) at org.apache.accumulo.test.functional.SessionBlockVerifyIT$$Lambda/0x00007fbd943acba8.call(Unknown Source)
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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: