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From Anubhav Kale <Anubhav.K...@microsoft.com>
Subject RemoveNode CPU Spike Question
Date Tue, 10 Jan 2017 17:57:37 GMT
Hello,

Recently, I started noticing an interesting pattern. When I execute "removenode", a subset
of the nodes that now own the tokens result it in a CPU spike / disk activity, and sometimes
SSTables on those nodes shoot up.

After looking through the code, it appears to me that below function forces data to be streamed
from some of the new nodes to the node from where "removenode" is kicked in. Is my understanding
correct ?

https://github.com/apache/cassandra/blob/d384e781d6f7c028dbe88cfe9dd3e966e72cd046/src/java/org/apache/cassandra/service/StorageService.java#L2548

Our nodes don't run very hot, but it appears this streaming causes them to have issues. Have
other people seen this ?

Thanks !

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