Devarshi Shah created ZOOKEEPER-4247:
----------------------------------------
Summary:
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage throws
NullPointerException
Key: ZOOKEEPER-4247
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4247
Project: ZooKeeper
Issue Type: Bug
Affects Versions: 3.6.2
Environment: K8S
Reporter: Devarshi Shah
*Problem:*
While upgrading K8S cluster, container running Zookeeper (during serving it's
client) will rollover one by one.
During this rollover, +Null Pointer Exception+ was observed as below.
After updating to the latest Zookeeper 3.6.2 we still see the problem.
This is happening on a fresh install (and has all the time).
*Stack-trace**:*
<from zk-pod-0-log>
{code:java}
2021-02-08T12:42:08.229+0000 [myid:] - ERROR
[nioEventLoopGroup-4-1:NettyServerCnxnFactory$CnxnChannelHandler@329] -
Unexpected exception in receive
java.lang.NullPointerException: null
at
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:518)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:368)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
[zookeeper-3.6.2.jar:3.6.2]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at java.lang.Thread.run(Thread.java:834) [?:?]
2021-02-08T12:42:08.229+0000 [myid:] - WARN
[nioEventLoopGroup-4-1:NettyServerCnxnFactory$CnxnChannelHandler@273] -
Exception caught
java.lang.NullPointerException: null
at
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:518)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:368)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
~[zookeeper-3.6.2.jar:3.6.2]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at java.lang.Thread.run(Thread.java:834) [?:?]
{code}
*Expectation:*
This scenario should be handled and application should not throw such Null
Pointer exception.
We are kindly requesting Apache Zookeeper team to fix this issue.
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