net.snowflake.ingest.streaming.OffsetTokenVerificationFunction Maven / Gradle / Ivy
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/*
* Copyright (c) 2024 Snowflake Computing Inc. All rights reserved.
*/
package net.snowflake.ingest.streaming;
/**
* Interface to provide a custom offset verification logic. If specified, verification failures will
* be logged as warnings and reported to Snowflake. This interface could be used when there are
* certain assumption about the offset token behavior. Please reach out to Snowflake if you notice
* any unexpected behaviors.
*
* Below is an example that verifies that all offset tokens are monotonically increasing numbers:
*
*
*
* private static final OffsetTokenVerificationFunction offsetTokenVerificationFunction =
* (prevBatchEndOffset, curBatchStartOffset, curBatchEndOffset, rowCount) -> {
* boolean isMatch = true;
*
* if (curBatchStartOffset != null) {
* try {
* long curStart = Long.parseLong(curBatchStartOffset);
* long curEnd = Long.parseLong(curBatchEndOffset);
*
* // We verify that the end_offset - start_offset + 1 = row_count
* if (curEnd - curStart + 1 != rowCount) {
* isMatch = false;
* }
*
* // We verify that start_offset_of_current_batch = end_offset_of_previous_batch+1
* if (prevBatchEndOffset != null) {
* long prevEnd = Long.parseLong(prevBatchEndOffset);
* if (curStart != prevEnd + 1) {
* isMatch = false;
* }
* }
* } catch (NumberFormatException ignored) {
* // Do nothing since we can't compare the offset, or report a mismatch if number is expected
* }
* }
*
* return isMatch;
* };
*
*
*/
public interface OffsetTokenVerificationFunction {
/**
* @param prevBatchEndOffset end offset token of the previous batch
* @param curBatchStartOffset start offset token of the current batch
* @param curBatchEndOffset end offset token of the current batch
* @param rowCount number of rows in the current batch
* @return a boolean indicates whether the verification passed or not, if not, we will log a
* warning and report it to SF
*/
boolean verify(
String prevBatchEndOffset,
String curBatchStartOffset,
String curBatchEndOffset,
long rowCount);
}