beyond1920 commented on code in PR #4913:
URL: https://github.com/apache/hudi/pull/4913#discussion_r1233767393
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hudi-client/hudi-client-common/src/main/java/org/apache/hudi/io/HoodieWriteHandle.java:
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@@ -273,4 +280,31 @@ protected static Option<IndexedRecord>
toAvroRecord(HoodieRecord record, Schema
return Option.empty();
}
}
+
+ protected class AppendLogWriteCallback implements HoodieLogFileWriteCallback
{
+ // here we distinguish log files created from log files being appended.
Considering following scenario:
+ // An appending task write to log file.
+ // (1) append to existing file file_instant_writetoken1.log.1
+ // (2) rollover and create file file_instant_writetoken2.log.2
+ // Then this task failed and retry by a new task.
+ // (3) append to existing file file_instant_writetoken1.log.1
+ // (4) rollover and create file file_instant_writetoken3.log.2
+ // finally file_instant_writetoken2.log.2 should not be committed to hudi,
we use marker file to delete it.
+ // keep in mind that log file is not always fail-safe unless it never roll
over
+
Review Comment:
@guanziyue Thanks for response.
The problem would happen in two cases:
1. Enable speculation
2. Task failed and Driver not fail, the following retry tasks would always
failed until the job failed finally.
// The first task attempt write to log file.
// (1) append to existing file file_instant_writetoken1.log.1
// Then this task failed and Driver still alive, then a new task attempt
would retry
// (2) try to append to existing file file_instant_writetoken1.log.1,
but would fail because the append marker already exists.
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