milleruntime opened a new pull request #1890:
URL: https://github.com/apache/accumulo/pull/1890
* Check if the parent node exists before performing a sync and getting
the children in TransactionWatcher, preventing NoNodeExceptions.
Here is the exception that I have seen:
<pre>
2021-01-29T10:02:32,310 [tablet.BulkImportCacheCleaner] DEBUG: Error reading
bulk import live transactions {}
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode =
NoNode for /accumulo/cc552965-f3c2-48b6-b200-9d1f2a7c48c5/bulkTx
at
org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.KeeperException.create(KeeperException.java:54)
~[zookeeper-3.6.2.jar:3.6.2]
at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:2746)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.accumulo.fate.zookeeper.ZooReader.lambda$getChildren$5(ZooReader.java:87)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.retryLoopMutator(ZooReader.java:165)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.retryLoop(ZooReader.java:144)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.retryLoop(ZooReader.java:131)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.getChildren(ZooReader.java:87)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.server.zookeeper.TransactionWatcher$ZooArbitrator.allTransactionsAlive(TransactionWatcher.java:108)
~[accumulo-server-base-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.tserver.tablet.BulkImportCacheCleaner.run(BulkImportCacheCleaner.java:50)
~[accumulo-tserver-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[?:?]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
~[?:?]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
~[?:?]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
~[?:?]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
~[?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
</pre>
I don't understand what the `reader.sync()` method call is doing, so I am
not sure if that should be called before `exists()` or not. The
`reader.sync()` call is not throwing the exception so it may be OK to call that
before checking.
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