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https://issues.apache.org/jira/browse/CASSANDRA-9111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486174#comment-14486174
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prmg commented on CASSANDRA-9111:
---------------------------------
oops, sorry about that. for some reason I used git diff --color to generate the
patch (that's why the strange characters). now created and attached a proper
patch with git format-patch. :)
> SSTables originated from the same incremental repair session have different
> repairedAt timestamps
> -------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-9111
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9111
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: prmg
> Attachments: CASSANDRA-9111-v0.txt
>
>
> CASSANDRA-7168 optimizes QUORUM reads by skipping incrementally repaired
> SSTables on other replicas that were repaired on or before the maximum
> repairedAt timestamp of the coordinating replica's SSTables for the query
> partition.
> One assumption of that optimization is that SSTables originated from the same
> repair session in different nodes will have the same repairedAt timestamp,
> since the objective is to skip reading SSTables originated in the same repair
> session (or before).
> However, currently, each node timestamps independently SSTables originated
> from the same repair session, so they almost never have the same timestamp.
> Steps to reproduce the problem:
> {code}
> ccm create test
> ccm populate -n 3
> ccm start
> ccm node1 cqlsh;
> {code}
> {code:sql}
> CREATE KEYSPACE foo WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 3};
> CREATE TABLE foo.bar ( key int, col int, PRIMARY KEY (key) ) ;
> INSERT INTO foo.bar (key, col) VALUES (1, 1);
> exit;
> {code}
> {code}
> ccm node1 flush;
> ccm node2 flush;
> ccm node3 flush;
> nodetool -h 127.0.0.1 -p 7100 repair -par -inc foo bar
> [2015-04-02 21:56:07,726] Starting repair command #1, repairing 3 ranges for
> keyspace foo (parallelism=PARALLEL, full=false)
> [2015-04-02 21:56:07,816] Repair session 3655b670-d99c-11e4-b250-9107aba35569
> for range (3074457345618258602,-9223372036854775808] finished
> [2015-04-02 21:56:07,816] Repair session 365a4a50-d99c-11e4-b250-9107aba35569
> for range (-9223372036854775808,-3074457345618258603] finished
> [2015-04-02 21:56:07,818] Repair session 365bf800-d99c-11e4-b250-9107aba35569
> for range (-3074457345618258603,3074457345618258602] finished
> [2015-04-02 21:56:07,995] Repair command #1 finished
> sstablemetadata
> ~/.ccm/test/node1/data/foo/bar-377b5540d99d11e49cc09107aba35569/foo-bar-ka-1-Statistics.db
>
> ~/.ccm/test/node2/data/foo/bar-377b5540d99d11e49cc09107aba35569/foo-bar-ka-1-Statistics.db
>
> ~/.ccm/test/node3/data/foo/bar-377b5540d99d11e49cc09107aba35569/foo-bar-ka-1-Statistics.db
> | grep Repaired
> Repaired at: 1428023050318
> Repaired at: 1428023050322
> Repaired at: 1428023050340
> {code}
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