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https://issues.apache.org/jira/browse/SPARK-17401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15464899#comment-15464899
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Sean Owen commented on SPARK-17401:
-----------------------------------
4040 is normally where the Spark UI binds, not master. I think you have
something mixed up where, where something is talking to the UI when it expects
to talk to the master or vice versa. Run your master on some other port to rule
out this mix up.
> Scala IDE not able to connect to Spark Master
> ---------------------------------------------
>
> Key: SPARK-17401
> URL: https://issues.apache.org/jira/browse/SPARK-17401
> Project: Spark
> Issue Type: Bug
> Components: Build, Deploy, Examples
> Affects Versions: 2.0.0
> Environment: Windows (x64 Bit)
> Reporter: Sachin Gupta
> Priority: Blocker
>
> Able to compile Spark project in Scala IDE. We've started master using
> "spark-shell" which works fine from console with master reachable at
> http://localhost:4040.
> When we execute project from IDE it says can't connect to port 4040 and tries
> on 4041. On master console (DOS) following error is shown:
> 16/09/05 17:40:35 WARN HttpParser: Illegal character 0x0 in state=START for
> buff
> er
> HeapByteBuffer@773c8742[p=1,l=1302,c=16384,r=1301]={\x00<<<\x00\x00\x00\x00\x
> 00\x05\x16\x03N\x8d\xFcA\xE1\xDb.\x16\x00...\x00\r192.168.13.61>>>\x00\x00\x00\x
> 00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00...\x00\x00\x00\x00\x00\x0
> 0\x00\x00\x00\x00\x00\x00\x00\x00\x00}
> 16/09/05 17:40:35 WARN HttpParser: badMessage: 400 Illegal character 0x0 for
> Htt
> pChannelOverHttp@660d0260{r=0,c=false,a=IDLE,uri=}
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