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https://issues.apache.org/jira/browse/HBASE-2286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852882#action_12852882
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George P. Stathis commented on HBASE-2286:
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Clint,
A few additional notes: I downloaded the latest trunk and the patch is outdated
against it. I was able to manually apply the differences but I am getting test
failures:
Running org.apache.hadoop.hbase.client.tableindexed.TestIndexedTable
Tests run: 7, Failures: 0, Errors: 7, Skipped: 0, Time elapsed: 1.511 sec <<<
FAILURE!
Running org.apache.hadoop.hbase.regionserver.transactional.TestTHLog
Tests run: 5, Failures: 0, Errors: 5, Skipped: 0, Time elapsed: 1.307 sec <<<
FAILURE!
Running org.apache.hadoop.hbase.regionserver.transactional.TestTHLogRecovery
Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 450.93 sec <<<
FAILURE!
But, a --dry-run against the 0.20.3 distro source seems to apply with no
problems, so I'll try the patch there instead of trunk.
> [Transactional Contrib] Correctly handle or avoid cases where writes occur in
> same millisecond
> ----------------------------------------------------------------------------------------------
>
> Key: HBASE-2286
> URL: https://issues.apache.org/jira/browse/HBASE-2286
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: contrib
> Reporter: Clint Morgan
> Fix For: 0.20.4, 0.21.0
>
> Attachments: hbase-2286.patch
>
>
> This patch fixes a few issues where puts/deletes occur with the same
> timestamp.
> In the indexing layer, we avoid a Delete followed by a Put to the same row
> for the index update. When the row is the same, we can just do the put.
> In the transactional layer, we correctly handled put, put, scan. This way the
> scan will see the last put, even if they have the same timestamp.
> Remove the sleep to fix the putPutScan transactional test, and run it many
> times to be sure we hit the case where they are in the same millisecond.
> Also some small cleanup, null handling, and fail-fast changes.
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