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https://issues.apache.org/jira/browse/CASSANDRA-12156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15369023#comment-15369023
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vin01 commented on CASSANDRA-12156:
-----------------------------------
And followin this there were more errors like :-
ERROR [SharedPool-Worker-14] 2016-07-09 00:09:23,547 Message.java:611 -
Unexpected exception during request; channel = [id: 0x7e101236,
/192.168.100.91:36421 => $
java.lang.ClassCastException: null
no stack-trace for these was there.
> java.lang.ClassCastException During Write Operations
> ----------------------------------------------------
>
> Key: CASSANDRA-12156
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12156
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Centos 6.7, JDK1.8.0_72, Cassandra 3.0.7
> Reporter: vin01
>
> During a regular ETL process today suddenly i am getting some errors from
> cassandra which look like :-
> ERROR [SharedPool-Worker-28] 2016-07-09 00:07:04,062 Message.java:611 -
> Unexpected exception during request; channel = [id: 0x7e101236,
> /ip.add.re.ss:36421 => /ip.add.re.ss:9044]
> io.netty.handler.codec.DecoderException: java.lang.ClassCastException:
> java.lang.String cannot be cast to [B
> at
> io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:99)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:971)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:854)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:249)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:149)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.epoll.EpollSocketChannel$EpollSocketUnsafe.epollInReady(EpollSocketChannel.java:722)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:326)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:264)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_72]
> Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to [B
> at
> io.netty.buffer.PooledHeapByteBuf.array(PooledHeapByteBuf.java:280)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> at
> org.apache.cassandra.transport.FrameCompressor$LZ4Compressor.decompress(FrameCompressor.java:191)
> ~[apache-cassandra-3.0.7.jar:3.0.7]
> at
> org.apache.cassandra.transport.Frame$Decompressor.decode(Frame.java:310)
> ~[apache-cassandra-3.0.7.jar:3.0.7]
> at
> org.apache.cassandra.transport.Frame$Decompressor.decode(Frame.java:289)
> ~[apache-cassandra-3.0.7.jar:3.0.7]
> at
> io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89)
> ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
> ... 18 common frames omitted
> it didn't affect the application though but i haven't seen it before and
> seems like something is wrong.
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