jmark99 opened a new issue #1800:
URL: https://github.com/apache/accumulo/issues/1800
Since changing the ZK version to 3.5.8 a new error has been appearing in the
logs.
<pre>
2020-11-20T10:40:02,189 [tracer.ZooTraceClient] ERROR: unable to get
destination hosts in zookeeper
org.apache.accumulo.fate.zookeeper.ZooSession$ZooSessionShutdownException:
The Accumulo singleton that that tracks zookeeper session is disabled. This is
likely caused by all AccumuloClients being closed or garbage collected.
at
org.apache.accumulo.fate.zookeeper.ZooSession.getSession(ZooSession.java:196)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooSession.getAnonymousSession(ZooSession.java:189)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.getZooKeeper(ZooReader.java:57)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.retryLoopMutator(ZooReader.java:165)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.retryLoop(ZooReader.java:144)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.retryLoop(ZooReader.java:131)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.getStatus(ZooReader.java:78)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.fate.zookeeper.ZooReader.exists(ZooReader.java:96)
~[accumulo-core-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.tracer.ZooTraceClient.updateHostsFromZooKeeper(ZooTraceClient.java:134)
~[accumulo-tracer-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.tracer.ZooTraceClient.process(ZooTraceClient.java:102)
[accumulo-tracer-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:535)
[zookeeper-3.5.8.jar:3.5.8]
at
org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
[zookeeper-3.5.8.jar:3.5.8]
</pre>
I have observed the issue while going through several different accumulo
examples from the Accumulo-Example repo. It can be seen while running some IT
tests as well. In particular, running the ShellIT#insertDeleteScanTest appears
to consitently throw the exception.
The error should be examined to determine if it is a cause for alarm. It has
not appeared to cause any issues as of yet, but if it could be understood and
resolved that would be preferred.
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