Re: Question regarding major compaction.

2012-04-26 Thread Ji Cheng
I'm also quite interested in this question. Here's my understanding on this problem. 1. If your workload is append-only, doing a major compaction shouldn't affect the read performance too much, because each row appears in one sstable anyway. 2. If your workload is mostly updating existing rows, t

Re: High latency of cassandra

2012-04-24 Thread Ji Cheng
The tpstats shows there was no read request pending on this node. Maybe you should have a look at the other nodes first. But my suggestion is to upgrade hector to 1.0.x if possible. Hector 0.7 is for cassandra 0.7. Just FYI, we had some issues when upgrading cassandra from 0.8 to 1.0. And the prob

Re: nodetool decommission hangs

2012-04-21 Thread Ji Cheng
It needs to stream all its data to the other node, which may take a long time. You can use nodetool netstats to see the progress of streaming. Best, Cheng On Sun, Apr 22, 2012 at 4:11 AM, Aniket Chakrabarti < chakr...@cse.ohio-state.edu> wrote: > Hi, > > I am trying to use nodetool decommission

Re: java.io.IOException: Could not get input splits

2011-09-05 Thread Ji Cheng
Hi. We got the same problem here. Even the wordcount map/reduce example in the source tar works fine with one node, but fails with the same exception on a two node cluster. CASSANDRA-3044 mentioned that a temporary work around is to disable node auto discovery. Can anyone tell me how to do that in