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https://issues.apache.org/jira/browse/KUDU-2031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16041547#comment-16041547
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Alexey Serbin commented on KUDU-2031:
-------------------------------------
Some print-outs of the scanned rows when the expected behavior was not observed
(run via dist-test with --stress_cpu_threads=8 the binaries built from
https://gerrit.cloudera.org/#/c/7037/10 in DEBUG):
READ_AT_SNAPSHOT with CLOSEST_REPLICA:
{noformat}
Value of: row_strings.size()
Actual: 5
Expected: kNumTabletServers * (i + 1)
Which is: 6
(int32 key=0, int32 val=0) (int32 key=2, int32 val=2) (int32 key=1, int32
val=1) (int32 key=5, int32 val=2) (int32 key=3, int32 val=0)
{noformat}
The expected set of keys: {{0, 1, 2, 3, 4, 5}}, the actual: {{0, 2, 1, 5, 3}};
i.e. key 4 is missing.
After adding the fault-tolerant property for scanners (i.e. calling
{{KuduScanner::SetFaultTolerant()}}):
READ_AT_SNAPSHOT with CLOSEST_REPLICA, the fault-tolerant property is set:
{noformat}
Value of: row_strings.size()
Actual: 4
Expected: kNumTabletServers * (i + 1)
Which is: 6
(int32 key=0, int32 val=0) (int32 key=2, int32 val=2) (int32 key=1, int32
val=1) (int32 key=3, int32 val=0)
{noformat}
The expected set of keys: {{0, 1, 2, 3, 4, 5}}, the actual: {{0, 2, 1, 3}};
i.e. keys 4 and 5 are missing.
> READ_AT_SNAPSHOT scans with {CLOSEST_REPLICA, FIRST_REPLICA} selectors do not
> yield RYW behavior in some scenarios
> ------------------------------------------------------------------------------------------------------------------
>
> Key: KUDU-2031
> URL: https://issues.apache.org/jira/browse/KUDU-2031
> Project: Kudu
> Issue Type: Bug
> Components: client, tserver
> Affects Versions: 1.4.0
> Reporter: Alexey Serbin
> Labels: consistency
>
> Running the updated scenario
> {{ClientFailoverOnNegotiationTimeoutITest.Kudu1580ConnectToTServer}} from
> {{client-negotiation-failover-itest}} sometimes fails to read the freshly
> written rows if running READ_AT_SNAPSHOT scan with {{CLOSEST_REPLICA,
> FIRST_REPLICA}} selection modes.
> To reproduce, run patch from https://gerrit.cloudera.org/#/c/7037/8 built in
> DEBUG configuration. The patch might be applied to the recent sources from
> the main trunk as of 2017-06-03 (e.g.
> e3b7d4dc1a6be020f3f126a66192ca1451e95e6f).
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