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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16423) Add re-compare option to VerifyReplication to avoid occasional inconsistent rows
Date Wed, 21 Sep 2016 15:23:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15510275#comment-15510275

Ted Yu commented on HBASE-16423:

125	        sleepToReCompare = conf.getInt(NAME +".sleepToReCompare", 0);
How about naming the parameter sleepMsBeforeReCompare ?
+          return;
+        } catch (Exception e) {
+          LOG.error("recompare fail!");
Can you log more information in the error (such as row key) ?
+    System.err.println(" recomparesleep   milliseconds to sleep before recompare row.");
Please mention that value 0 disables recomparison.

> Add re-compare option to VerifyReplication to avoid occasional inconsistent rows
> --------------------------------------------------------------------------------
>                 Key: HBASE-16423
>                 URL: https://issues.apache.org/jira/browse/HBASE-16423
>             Project: HBase
>          Issue Type: Improvement
>          Components: Replication
>    Affects Versions: 2.0.0
>            Reporter: Jianwei Cui
>            Priority: Minor
>         Attachments: HBASE-16423-v1.patch
> Because replication keeps eventually consistency, VerifyReplication may report inconsistent
rows if there are data being written to source or peer clusters during scanning. These occasionally
inconsistent rows will have the same data if we do the comparison again after a short period.
It is not easy to find the really inconsistent rows if VerifyReplication report a large number
of such occasionally inconsistency. To avoid this case, we can add an option to make VerifyReplication
read out the inconsistent rows again after sleeping a few seconds and re-compare the rows
during scanning. This behavior follows the eventually consistency of hbase's replication.
Suggestions and discussions are welcomed.

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