[KUDU-2473] READ_YOUR_WRITES error on snapshot timestamp

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Duplicate
• Fix Version/s: n/a
• Component/s: impala
• Assignee: Unassigned
• Reporter: Thomas Tauber-Marshall
• Created: 12/Jun/18 23:47
• Updated: 14/Jun/18 16:23
• Resolved: 14/Jun/18 16:23

Description

I'm trying to implement support for READ_YOUR_WRITES for Impala, but I'm finding that if SetLatestObservedTimestamp() isn't called (eg. because we haven't interacted with Kudu yet in the current session and don't have a timestamp to set), attempting to scan tables always fails with an error of the form:
org.apache.kudu.client.NonRecoverableException: Snapshot timestamp is earlier than the ancient history mark. Consider increasing the value of the configuration parameter --tablet_history_max_age_sec. Snapshot timestamp: P: 0 usec, L: 1 Ancient History Mark: P: 1528845756599966 usec, L: 0 Physical time difference: -1528845756.600s

Minimal repro:

KuduClientBuilder b = new KuduClient.KuduClientBuilder("localhost");
KuduClient client = b.build();
KuduTable table = client.openTable("read_mode_test");
KuduScannerBuilder scannerBuilder = client.newScannerBuilder(table);
scannerBuilder.readMode(AsyncKuduScanner.ReadMode.READ_YOUR_WRITES);
KuduScanner scanner = scannerBuilder.build();
while (scanner.hasMoreRows()) {
  scanner.nextRows();
}

I'm using Kudu at git hash a954418

Issue Links

• is related to: KUDU-2415 READ_YOUR_WRITES scan with no prior operation fails