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Add lower bound for translog flush threshold #28382
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Original file line number | Diff line number | Diff line change |
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@@ -1477,14 +1477,7 @@ public boolean shouldPeriodicallyFlush() { | |
* thus the IndexWriter#hasUncommittedChanges condition is not considered. | ||
*/ | ||
final long uncommittedSizeOfNewCommit = translog.sizeOfGensAboveSeqNoInBytes(localCheckpointTracker.getCheckpoint() + 1); | ||
/* | ||
* If flushThreshold is too small, we may repeatedly flush even there is no uncommitted operation | ||
* as #sizeOfGensAboveSeqNoInByte and #uncommittedSizeInBytes can return different values. | ||
* An empty translog file has non-zero `uncommittedSize` (the translog header), and method #sizeOfGensAboveSeqNoInBytes can | ||
* return 0 now(no translog gen contains ops above local checkpoint) but method #uncommittedSizeInBytes will return an actual | ||
* non-zero value after rolling a new translog generation. This can be avoided by checking the actual uncommitted operations. | ||
*/ | ||
return uncommittedSizeOfNewCommit < uncommittedSizeOfCurrentCommit && translog.uncommittedOperations() > 0; | ||
return uncommittedSizeOfNewCommit < uncommittedSizeOfCurrentCommit; | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. can we add an assertion that the uncommitOps is >0 ? |
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} | ||
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@Override | ||
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Original file line number | Diff line number | Diff line change |
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@@ -108,6 +108,7 @@ public class Translog extends AbstractIndexShardComponent implements IndexShardC | |
public static final String CHECKPOINT_FILE_NAME = "translog" + CHECKPOINT_SUFFIX; | ||
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static final Pattern PARSE_STRICT_ID_PATTERN = Pattern.compile("^" + TRANSLOG_FILE_PREFIX + "(\\d+)(\\.tlog)$"); | ||
public static final int DEFAULT_HEADER_SIZE_IN_BYTES = TranslogWriter.getHeaderLength(UUIDs.randomBase64UUID()); | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. can we assert somewhere that this is correct? |
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// the list of translog readers is guaranteed to be in order of translog generation | ||
private final List<TranslogReader> readers = new ArrayList<>(); | ||
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I think we need to adapt the comment above?