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From Jonathan Colby <>
Subject new thing going on with repair in 0.7.6??
Date Sat, 28 May 2011 10:43:55 GMT
It might just not have occurred to me in the previous 0.7.4 version,
but when I do a repair on a node in v0.7.6, it seems like data is also
synced with neighboring nodes.

My understanding of repair is that the data is reconciled one the node
being repaired. i.e., data is removed or added to that node based on
"reading" the data on other nodes.

I read another thread about a bug which results in the entire data
being streamed over when you don't specify a CF.  But in my case, we
only have one CF - we're using cassandra as a simple key/value store
so I don't think it applies to my setup.

This is a netstats on the node being repaired. Note how everything is
streaming out to other nodes.  Is this a bug or an "improvement"?

Mode: Normal
Streaming to: /
   /var/lib/cassandra/data/DFS/main-f-1833-Data.db sections=2542
progress=6243767484/48128279825 - 12%
   /var/lib/cassandra/data/DFS/main-f-1886-Data.db sections=2146
progress=0/748205318 - 0%
   /var/lib/cassandra/data/DFS/main-f-1854-Data.db sections=2542
progress=0/47640938847 - 0%
   /var/lib/cassandra/data/DFS/main-f-1851-Data.db sections=2502
progress=0/1587416504 - 0%
   /var/lib/cassandra/data/DFS/main-f-1892-Data.db sections=1409
progress=0/175226826 - 0%
   /var/lib/cassandra/data/DFS/main-f-1850-Data.db sections=1108
progress=0/107442430 - 0%
   /var/lib/cassandra/data/DFS/main-f-1859-Data.db sections=2542
progress=0/81697265819 - 0%
Streaming to: /
   /var/lib/cassandra/data/DFS/main-f-1854-Data.db sections=72
progress=0/303912581 - 0%
   /var/lib/cassandra/data/DFS/main-f-1851-Data.db sections=71
progress=0/24604460 - 0%
   /var/lib/cassandra/data/DFS/main-f-1892-Data.db sections=26
progress=0/30900263 - 0%
   /var/lib/cassandra/data/DFS/main-f-1850-Data.db sections=19
progress=0/150012 - 0%
   /var/lib/cassandra/data/DFS/main-f-1859-Data.db sections=72
progress=0/436200262 - 0%
Streaming to: /
   /var/lib/cassandra/data/DFS/main-f-1892-Data.db sections=193
progress=0/54332711 - 0%
   /var/lib/cassandra/data/DFS/main-f-1851-Data.db sections=693
progress=0/52937963 - 0%
   /var/lib/cassandra/data/DFS/main-f-1850-Data.db sections=135
progress=0/1323107 - 0%
   /var/lib/cassandra/data/DFS/main-f-1859-Data.db sections=702
progress=0/4220897850 - 0%
 Nothing streaming from /

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