Jon Meredith created CASSANDRA-15949:
----------------------------------------

             Summary: NPE thrown while updating speculative execution time if 
table is removed during task execution
                 Key: CASSANDRA-15949
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15949
             Project: Cassandra
          Issue Type: Bug
          Components: Local/Other
            Reporter: Jon Meredith


CASSANDRA-14338 fixed the scheduling the speculation retry threshold 
calculation, but if the task happens to be scheduled while a table is being 
dropped, it triggers an NPE. 


ERROR 2020-07-14T11:34:55,762 [OptionalTasks:1] 
org.apache.cassandra.service.CassandraDaemon:446 - Exception in thread 
Thread[OptionalTasks:1,5,main]
java.lang.NullPointerException: null
       at org.apache.cassandra.db.Keyspace.initCf(Keyspace.java:444) 
~[cassandra-4.0.0.jar:4.0.0]
       at org.apache.cassandra.db.Keyspace.<init>(Keyspace.java:346) 
~[cassandra-4.0.0.jar:4.0.0]
       at org.apache.cassandra.db.Keyspace.open(Keyspace.java:139) 
~[cassandra-4.0.0.jar:4.0.0]
       at org.apache.cassandra.db.Keyspace.open(Keyspace.java:116) 
~[cassandra-4.0.0.jar:4.0.0]
       at org.apache.cassandra.db.Keyspace$1.apply(Keyspace.java:102) 
~[cassandra-4.0.0.jar:4.0.0]
       at org.apache.cassandra.db.Keyspace$1.apply(Keyspace.java:99) 
~[cassandra-4.0.0.jar:4.0.0]
       at 
com.google.common.collect.Iterables$5.lambda$forEach$0(Iterables.java:704) 
~[guava-27.0-jre.jar:?]
       at 
com.google.common.collect.IndexedImmutableSet.forEach(IndexedImmutableSet.java:45)
 ~[guava-27.0-jre.jar:?]
       at com.google.common.collect.Iterables$5.forEach(Iterables.java:704) 
~[guava-27.0-jre.jar:?]
       at 
org.apache.cassandra.service.CassandraDaemon.lambda$setup$2(CassandraDaemon.java:412)
 ~[cassandra-4.0.0.jar:4.0.0]
       at 
org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor$UncomplainingRunnable.run(DebuggableScheduledThreadPoolExecutor.java:118)
 [cassandra-4.0.0.jar:4.0.0]
       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 
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 [netty-all-4.1.37.Final.jar:4.1.37.Final]
       at java.lang.Thread.run(Thread.java:834) [?:?]



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