What does the arrow mean in this netty layer exception

I see this on one of the nodes (on 214)

[2015-04-07 16:28:02,550][WARN ][transport.netty ] [Reyes, Cecelia]
exception caught on netty layer [[id: 0x03d14f1c, / => /]]
java.lang.OutOfMemoryError: Java heap space

Well, so 214 was OOM,, am I right? But what does the arrow mean?


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