[
https://issues.apache.org/jira/browse/CASSANDRA-14525?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jaydeepkumar Chovatia updated CASSANDRA-14525:
----------------------------------------------
Description:
If bootstrap fails for newly joining node (most common reason is due to
streaming failure) then Cassandra state remains in {{joining}} state which is
fine but Cassandra also enables Native transport which makes overall state
inconsistent. This further creates NullPointer exception if auth is enabled on
the new node, please find reproducible steps here:
For example if bootstrap fails due to streaming errors like
{quote}java.util.concurrent.ExecutionException:
org.apache.cassandra.streaming.StreamException: Stream failed
at
com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:299)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:286)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
~[guava-18.0.jar:na]
at
org.apache.cassandra.service.StorageService.bootstrap(StorageService.java:1256)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:894)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.StorageService.initServer(StorageService.java:660)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.StorageService.initServer(StorageService.java:573)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:330)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:567)
[apache-cassandra-3.0.16.jar:3.0.16]
at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:695)
[apache-cassandra-3.0.16.jar:3.0.16]
Caused by: org.apache.cassandra.streaming.StreamException: Stream failed
at
org.apache.cassandra.streaming.management.StreamEventJMXNotifier.onFailure(StreamEventJMXNotifier.java:85)
~[apache-cassandra-3.0.16.jar:3.0.16]
at com.google.common.util.concurrent.Futures$6.run(Futures.java:1310)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202)
~[guava-18.0.jar:na]
at
org.apache.cassandra.streaming.StreamResultFuture.maybeComplete(StreamResultFuture.java:211)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.StreamResultFuture.handleSessionComplete(StreamResultFuture.java:187)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.StreamSession.closeSession(StreamSession.java:440)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.StreamSession.onError(StreamSession.java:540)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.ConnectionHandler$IncomingMessageHandler.run(ConnectionHandler.java:307)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:79)
~[apache-cassandra-3.0.16.jar:3.0.16]
at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
{quote}
then variable [StorageService.java::dataAvailable
|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L892]
will be {{false}}. Since {{dataAvailable}} is {{false}} hence it will not call
[StorageService.java::finishJoiningRing
|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L933]
and as a result
[StorageService.java::doAuthSetup|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L999]
will not be invoked.
API [StorageService.java::joinTokenRing
|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L763]
returns without any problem. After this
[CassandraDaemon.java::start|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/CassandraDaemon.java#L584]
is invoked which starts native transport at
[CassandraDaemon.java::startNativeTransport
|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/CassandraDaemon.java#L478]
At this point daemon’s bootstrap is still not finished and transport is
enabled. So client will connect to the node and will encounter
{{java.lang.NullPointerException}} as following:
{quote}ERROR [SharedPool-Worker-2] Message.java:647 - Unexpected exception
during request; channel = [id: 0x412a26b3, L:/a.b.c.d:9042 - R:/p.q.r.s:20121]
java.lang.NullPointerException: null
at
org.apache.cassandra.auth.PasswordAuthenticator.doAuthenticate(PasswordAuthenticator.java:160)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.auth.PasswordAuthenticator.authenticate(PasswordAuthenticator.java:82)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.auth.PasswordAuthenticator.access$100(PasswordAuthenticator.java:54)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.auth.PasswordAuthenticator$PlainTextSaslAuthenticator.getAuthenticatedUser(PasswordAuthenticator.java:198)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:78)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:535)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:429)
[apache-cassandra-3.0.16.jar:3.0.16]
at
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[netty-all-4.1.0.CR6.jar:4.1.0.CR6]
at
io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelReadNow(ChannelHandlerInvokerUtil.java:83)
[netty-all-4.1.0.CR6.jar:4.1.0.CR6]
at
io.netty.channel.DefaultChannelHandlerInvoker$7.run(DefaultChannelHandlerInvoker.java:159)
[netty-all-4.1.0.CR6.jar:4.1.0.CR6]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[na:1.8.0_121]
at
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
[apache-cassandra-3.0.16.jar:3.0.16]
at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
[apache-cassandra-3.0.16.jar:3.0.16]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]
{quote}
At this point if we run {{nodetool status}} then it will show this new node in
{{UJ}} state, however clients can connect to this node over {{CQL}} and will
receive {{java.lang.NullPointerException}}
was:
If bootstrap fails for newly joining node (most common reason is due to
streaming failure) then Cassandra state remains in {{joining}} state which is
fine but Cassandra also enables Native transport which makes overall state
inconsistent. This further creates NullPointer exception if auth is enabled on
the new node, please find reproducible steps here:
For example if bootstrap fails due to streaming errors like
{quote}
java.util.concurrent.ExecutionException:
org.apache.cassandra.streaming.StreamException: Stream failed
at
com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:299)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:286)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
~[guava-18.0.jar:na]
at
org.apache.cassandra.service.StorageService.bootstrap(StorageService.java:1256)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:894)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.StorageService.initServer(StorageService.java:660)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.StorageService.initServer(StorageService.java:573)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:330)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:567)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:695)
[apache-cassandra-3.0.16.jar:3.0.16]
Caused by: org.apache.cassandra.streaming.StreamException: Stream failed
at
org.apache.cassandra.streaming.management.StreamEventJMXNotifier.onFailure(StreamEventJMXNotifier.java:85)
~[apache-cassandra-3.0.16.jar:3.0.16]
at com.google.common.util.concurrent.Futures$6.run(Futures.java:1310)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145)
~[guava-18.0.jar:na]
at
com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202)
~[guava-18.0.jar:na]
at
org.apache.cassandra.streaming.StreamResultFuture.maybeComplete(StreamResultFuture.java:211)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.StreamResultFuture.handleSessionComplete(StreamResultFuture.java:187)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.StreamSession.closeSession(StreamSession.java:440)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.StreamSession.onError(StreamSession.java:540)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.streaming.ConnectionHandler$IncomingMessageHandler.run(ConnectionHandler.java:307)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:79)
~[apache-cassandra-3.0.16.jar:3.0.16]
at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
{quote}
then variable [StorageService.java::dataAvailable
|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L892]
will be {{false}}. Since {{dataAvailable}} is {{false}} hence at it will not
call [StorageService.java::finishJoiningRing
|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L933]
and as a result
[StorageService.java::doAuthSetup|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L999]
will not be invoked.
API [StorageService.java::joinTokenRing |
https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L763]
returns without any problem. After this
[CassandraDaemon.java::start|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/CassandraDaemon.java#L584]
is invoked which starts native transport at
[CassandraDaemon.java::startNativeTransport
|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/CassandraDaemon.java#L478]
At this point daemon’s bootstrap is still not finished and transport is
enabled. So client will connect to the node and will encounter
{{java.lang.NullPointerException}} as following:
{quote}
ERROR [SharedPool-Worker-2] Message.java:647 - Unexpected exception during
request; channel = [id: 0x412a26b3, L:/a.b.c.d:9042 - R:/p.q.r.s:20121]
java.lang.NullPointerException: null
at
org.apache.cassandra.auth.PasswordAuthenticator.doAuthenticate(PasswordAuthenticator.java:160)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.auth.PasswordAuthenticator.authenticate(PasswordAuthenticator.java:82)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.auth.PasswordAuthenticator.access$100(PasswordAuthenticator.java:54)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.auth.PasswordAuthenticator$PlainTextSaslAuthenticator.getAuthenticatedUser(PasswordAuthenticator.java:198)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:78)
~[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:535)
[apache-cassandra-3.0.16.jar:3.0.16]
at
org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:429)
[apache-cassandra-3.0.16.jar:3.0.16]
at
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[netty-all-4.1.0.CR6.jar:4.1.0.CR6]
at
io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelReadNow(ChannelHandlerInvokerUtil.java:83)
[netty-all-4.1.0.CR6.jar:4.1.0.CR6]
at
io.netty.channel.DefaultChannelHandlerInvoker$7.run(DefaultChannelHandlerInvoker.java:159)
[netty-all-4.1.0.CR6.jar:4.1.0.CR6]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[na:1.8.0_121]
at
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
[apache-cassandra-3.0.16.jar:3.0.16]
at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
[apache-cassandra-3.0.16.jar:3.0.16]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]
{quote}
At this point if we run {{nodetool status}} then it will show this new node in
{{UJ}} state, however clients can connect to this node over {{CQL}} and will
receive {{java.lang.NullPointerException}}
> streaming failure during bootstrap makes new node into inconsistent state
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-14525
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14525
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jaydeepkumar Chovatia
> Priority: Major
>
> If bootstrap fails for newly joining node (most common reason is due to
> streaming failure) then Cassandra state remains in {{joining}} state which is
> fine but Cassandra also enables Native transport which makes overall state
> inconsistent. This further creates NullPointer exception if auth is enabled
> on the new node, please find reproducible steps here:
> For example if bootstrap fails due to streaming errors like
> {quote}java.util.concurrent.ExecutionException:
> org.apache.cassandra.streaming.StreamException: Stream failed
> at
> com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:299)
> ~[guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:286)
> ~[guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
> ~[guava-18.0.jar:na]
> at
> org.apache.cassandra.service.StorageService.bootstrap(StorageService.java:1256)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:894)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.service.StorageService.initServer(StorageService.java:660)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.service.StorageService.initServer(StorageService.java:573)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:330)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:567)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:695)
> [apache-cassandra-3.0.16.jar:3.0.16]
> Caused by: org.apache.cassandra.streaming.StreamException: Stream failed
> at
> org.apache.cassandra.streaming.management.StreamEventJMXNotifier.onFailure(StreamEventJMXNotifier.java:85)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at com.google.common.util.concurrent.Futures$6.run(Futures.java:1310)
> ~[guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
> ~[guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
> ~[guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145)
> ~[guava-18.0.jar:na]
> at
> com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202)
> ~[guava-18.0.jar:na]
> at
> org.apache.cassandra.streaming.StreamResultFuture.maybeComplete(StreamResultFuture.java:211)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.streaming.StreamResultFuture.handleSessionComplete(StreamResultFuture.java:187)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.streaming.StreamSession.closeSession(StreamSession.java:440)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.streaming.StreamSession.onError(StreamSession.java:540)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.streaming.ConnectionHandler$IncomingMessageHandler.run(ConnectionHandler.java:307)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:79)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
> {quote}
> then variable [StorageService.java::dataAvailable
> |https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L892]
> will be {{false}}. Since {{dataAvailable}} is {{false}} hence it will not
> call [StorageService.java::finishJoiningRing
> |https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L933]
> and as a result
> [StorageService.java::doAuthSetup|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L999]
> will not be invoked.
> API [StorageService.java::joinTokenRing
> |https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L763]
> returns without any problem. After this
> [CassandraDaemon.java::start|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/CassandraDaemon.java#L584]
> is invoked which starts native transport at
> [CassandraDaemon.java::startNativeTransport
> |https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/CassandraDaemon.java#L478]
> At this point daemon’s bootstrap is still not finished and transport is
> enabled. So client will connect to the node and will encounter
> {{java.lang.NullPointerException}} as following:
> {quote}ERROR [SharedPool-Worker-2] Message.java:647 - Unexpected exception
> during request; channel = [id: 0x412a26b3, L:/a.b.c.d:9042 - R:/p.q.r.s:20121]
> java.lang.NullPointerException: null
> at
> org.apache.cassandra.auth.PasswordAuthenticator.doAuthenticate(PasswordAuthenticator.java:160)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.auth.PasswordAuthenticator.authenticate(PasswordAuthenticator.java:82)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.auth.PasswordAuthenticator.access$100(PasswordAuthenticator.java:54)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.auth.PasswordAuthenticator$PlainTextSaslAuthenticator.getAuthenticatedUser(PasswordAuthenticator.java:198)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:78)
> ~[apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:535)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:429)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at
> io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
> [netty-all-4.1.0.CR6.jar:4.1.0.CR6]
> at
> io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelReadNow(ChannelHandlerInvokerUtil.java:83)
> [netty-all-4.1.0.CR6.jar:4.1.0.CR6]
> at
> io.netty.channel.DefaultChannelHandlerInvoker$7.run(DefaultChannelHandlerInvoker.java:159)
> [netty-all-4.1.0.CR6.jar:4.1.0.CR6]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [na:1.8.0_121]
> at
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
> [apache-cassandra-3.0.16.jar:3.0.16]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]
> {quote}
> At this point if we run {{nodetool status}} then it will show this new node
> in {{UJ}} state, however clients can connect to this node over {{CQL}} and
> will receive {{java.lang.NullPointerException}}
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