If you had RF3 in a 3 node cluster and everything was repaired you *should* be ok to only take the data from 1 node, if the cluster is not receiving writes.
If you want to merge the data from 3 nodes rename the files AFAIK they do not have to have contiguous file numbers. Cheers ----------------- Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 25/09/2011, at 10:45 PM, Yan Chunlu wrote: > thanks! another problem is what if cluster number are not the same? > > in my case I am move 3 nodes cluster data to 1 node, the keyspace files in 3 > nodes might use the same name... > > I am using the new cluster only for emergency usage, so only 1 node is > attached. > > On Sun, Sep 25, 2011 at 5:20 PM, aaron morton <aa...@thelastpickle.com> wrote: > That can read data from previous versions, i.e. if you upgrade to 0.8 it can > read the existing files from 0.7. > > But what you are doing with the sstable loader is (AFAIK) only copying the > Data portion of the CF. Once the table is loaded the node will then build the > Index and the Filter, this is the createBuild() call in the stack. It's > throwing because version 0.8 does not want to make version 0.8 Index and and > Filter files for a version 0.7 Data file. > > We get the same problem when upgrading from 0.7 to 0.8, where Repair will not > work because it is streaming a 0.7 version data file and the recipient then > tries to build the Index and Filter files. > > So to read 0.7 data from 0.8 just copy over *all* the files for the keyspace > (data, filter and index). Then scrub the nodes so that repair can work. > > Hope that helps. > > > ----------------- > Aaron Morton > Freelance Cassandra Developer > @aaronmorton > http://www.thelastpickle.com > > On 25/09/2011, at 6:07 PM, Yan Chunlu wrote: > >> yes, I did. thought 0.8 is downward compatible. is there other ways to load >> 0.7's data into 0.8? will copy the data dir directly will work? I would >> like to put load of three nodes into one node. >> >> thanks! >> >> On Sun, Sep 25, 2011 at 11:52 AM, aaron morton <aa...@thelastpickle.com> >> wrote: >> Looks like it is complaining that you are trying to load a 0.7 SSTable in >> 0.8. >> >> >> Cheers >> >> ----------------- >> Aaron Morton >> Freelance Cassandra Developer >> @aaronmorton >> http://www.thelastpickle.com >> >> On 23/09/2011, at 5:23 PM, Yan Chunlu wrote: >> >>> sorry I did not look into it.... after check it I found version mismatch >>> exception is in the log: >>> ERROR [Thread-17] 2011-09-22 08:24:24,248 AbstractCassandraDaemon.java >>> (line 139) Fatal exception in thread Thread[Thread-17,5,main] >>> java.lang.RuntimeException: Cannot recover SSTable >>> /disk2/cassandra/data/reddit/Comments-tmp-f-1 due to version mismatch. >>> (current version is g). >>> at >>> org.apache.cassandra.io.sstable.SSTableWriter.createBuilder(SSTableWriter.java:240) >>> at >>> org.apache.cassandra.db.compaction.CompactionManager.submitSSTableBuild(CompactionManager.java:1097) >>> at >>> org.apache.cassandra.streaming.StreamInSession.finished(StreamInSession.java:110) >>> at >>> org.apache.cassandra.streaming.IncomingStreamReader.readFile(IncomingStreamReader.java:104) >>> at >>> org.apache.cassandra.streaming.IncomingStreamReader.read(IncomingStreamReader.java:61) >>> at >>> org.apache.cassandra.net.IncomingTcpConnection.stream(IncomingTcpConnection.java:189) >>> at >>> org.apache.cassandra.net.IncomingTcpConnection.run(IncomingTcpConnection.java:117) >>> >>> >>> does that mean I need to run scrub before running the loader? could I just >>> delete it and keep going? thanks! >>> >>> On Fri, Sep 23, 2011 at 2:16 AM, Jonathan Ellis <jbel...@gmail.com> wrote: >>> Did you check for errors in logs on both loader + target? >>> >>> On Thu, Sep 22, 2011 at 10:52 AM, Yan Chunlu <springri...@gmail.com> wrote: >>> > I took a snapshot of one of my node in a cluster 0.7.4(N=RF=3). use >>> > sstableloader to load the snapshot data to another 1 node cluster(N=RF=1). >>> > >>> > after execute "bin/sstableloader /disk2/mykeyspace/" >>> > >>> > it says"Starting client (and waiting 30 seconds for gossip) ..." >>> > "Streaming revelant part of cf1.db..... to [10.23.2.4]" >>> > then showing the progress indicator and stopped. nothing changed after >>> > then. >>> > progress: [/10.28.53.16 1/72 (0)] [total: 0 - 0MB/s (avg: 0MB/s)]]] >>> > >>> > I use nodetool to check the node 10.23.2.4, nothing changed. no data >>> > copied >>> > to it. and the data dir also keep its original size. is there anything >>> > wrong? how can I tell what was going on there? >>> > thanks! >>> >>> >>> >>> -- >>> Jonathan Ellis >>> Project Chair, Apache Cassandra >>> co-founder of DataStax, the source for professional Cassandra support >>> http://www.datastax.com >>> >> >> > >
