mimaison commented on code in PR #17587:
URL: https://github.com/apache/kafka/pull/17587#discussion_r1818030649
##########
storage/src/main/java/org/apache/kafka/storage/internals/log/LocalLog.java:
##########
@@ -29,25 +35,768 @@
import java.io.File;
import java.io.IOException;
+import java.nio.file.Files;
import java.util.ArrayList;
+import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
+import java.util.Iterator;
import java.util.List;
+import java.util.Optional;
import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Consumer;
import java.util.function.Supplier;
+import java.util.regex.Pattern;
import java.util.stream.Collectors;
+import static java.util.Collections.singletonList;
import static org.apache.kafka.common.utils.Utils.require;
import static
org.apache.kafka.storage.internals.log.LogFileUtils.CLEANED_FILE_SUFFIX;
import static
org.apache.kafka.storage.internals.log.LogFileUtils.DELETED_FILE_SUFFIX;
+import static
org.apache.kafka.storage.internals.log.LogFileUtils.DELETE_DIR_SUFFIX;
+import static
org.apache.kafka.storage.internals.log.LogFileUtils.FUTURE_DIR_SUFFIX;
+import static
org.apache.kafka.storage.internals.log.LogFileUtils.STRAY_DIR_SUFFIX;
import static
org.apache.kafka.storage.internals.log.LogFileUtils.SWAP_FILE_SUFFIX;
import static org.apache.kafka.storage.internals.log.LogFileUtils.isLogFile;
+/**
+ * An append-only log for storing messages locally. The log is a sequence of
LogSegments, each with a base offset.
+ * New log segments are created according to a configurable policy that
controls the size in bytes or time interval
+ * for a given segment.
+ * NOTE: this class is not thread-safe, and it relies on the thread safety
provided by the Log class.
+ */
public class LocalLog {
private static final Logger LOG = LoggerFactory.getLogger(LocalLog.class);
+ public static final Pattern DELETE_DIR_PATTERN =
Pattern.compile("^(\\S+)-(\\S+)\\.(\\S+)" + LogFileUtils.DELETE_DIR_SUFFIX);
+ public static final Pattern FUTURE_DIR_PATTERN =
Pattern.compile("^(\\S+)-(\\S+)\\.(\\S+)" + LogFileUtils.FUTURE_DIR_SUFFIX);
+ public static final Pattern STRAY_DIR_PATTERN =
Pattern.compile("^(\\S+)-(\\S+)\\.(\\S+)" + LogFileUtils.STRAY_DIR_SUFFIX);
+ public static final long UNKNOWN_OFFSET = -1L;
+
+ // Last time the log was flushed
+ private final AtomicLong lastFlushedTime;
+ private final String logIdent;
+ private final LogSegments segments;
+ private final Scheduler scheduler;
+ private final Time time;
+ private final TopicPartition topicPartition;
+ private final LogDirFailureChannel logDirFailureChannel;
+ private final Logger logger;
+
+ private volatile LogOffsetMetadata nextOffsetMetadata;
+ // The memory mapped buffer for index files of this log will be closed
with either delete() or closeHandlers()
+ // After memory mapped buffer is closed, no disk IO operation should be
performed for this log.
+ private volatile boolean isMemoryMappedBufferClosed = false;
+ // Cache value of parent directory to avoid allocations in hot paths like
ReplicaManager.checkpointHighWatermarks
+ private volatile String parentDir;
+ private volatile LogConfig config;
+ private volatile long recoveryPoint;
+ private File dir;
+
+ /**
+ * @param dir The directory in which log segments are created.
+ * @param config The log configuration settings
+ * @param segments The non-empty log segments recovered from disk
+ * @param recoveryPoint The offset at which to begin the next recovery
i.e. the first offset which has not been flushed to disk
+ * @param nextOffsetMetadata The offset where the next message could be
appended
+ * @param scheduler The thread pool scheduler used for background actions
+ * @param time The time instance used for checking the clock
+ * @param topicPartition The topic partition associated with this log
+ * @param logDirFailureChannel The LogDirFailureChannel instance to
asynchronously handle Log dir failure
+ */
+ public LocalLog(File dir,
+ LogConfig config,
+ LogSegments segments,
+ long recoveryPoint,
+ LogOffsetMetadata nextOffsetMetadata,
+ Scheduler scheduler,
+ Time time,
+ TopicPartition topicPartition,
+ LogDirFailureChannel logDirFailureChannel) {
+ this.dir = dir;
+ this.config = config;
+ this.segments = segments;
+ this.recoveryPoint = recoveryPoint;
+ this.nextOffsetMetadata = nextOffsetMetadata;
+ this.scheduler = scheduler;
+ this.time = time;
+ this.topicPartition = topicPartition;
+ this.logDirFailureChannel = logDirFailureChannel;
+ this.logIdent = "[LocalLog partition=" + topicPartition + ", dir=" +
dir + "] ";
+ this.logger = new LogContext(logIdent).logger(LocalLog.class);
+ // Last time the log was flushed
+ this.lastFlushedTime = new AtomicLong(time.milliseconds());
+ this.parentDir = dir.getParent();
+ }
+
+ public File dir() {
+ return dir;
+ }
+
+ public Logger logger() {
+ return logger;
+ }
+
+ public LogConfig config() {
+ return config;
+ }
+
+ public LogSegments segments() {
+ return segments;
+ }
+
+ public Scheduler scheduler() {
+ return scheduler;
+ }
+
+ public LogOffsetMetadata nextOffsetMetadata() {
+ return nextOffsetMetadata;
+ }
+
+ public TopicPartition topicPartition() {
+ return topicPartition;
+ }
+
+ public LogDirFailureChannel logDirFailureChannel() {
+ return logDirFailureChannel;
+ }
+
+ public long recoveryPoint() {
+ return recoveryPoint;
+ }
+
+ public Time time() {
+ return time;
+ }
+
+ public String name() {
+ return dir.getName();
+ }
+
+ public String parentDir() {
+ return parentDir;
+ }
+
+ public File parentDirFile() {
+ return new File(parentDir);
+ }
+
+ public boolean isFuture() {
+ return dir.getName().endsWith(LogFileUtils.FUTURE_DIR_SUFFIX);
+ }
+
+ private <T> T maybeHandleIOException(Supplier<String> errorMsgSupplier,
StorageAction<T, IOException> function) {
+ return maybeHandleIOException(logDirFailureChannel, parentDir,
errorMsgSupplier, function);
+ }
+
+ /**
+ * Rename the directory of the log
+ * @param name the new dir name
+ * @throws KafkaStorageException if rename fails
+ */
+ public boolean renameDir(String name) {
+ return maybeHandleIOException(
+ () -> "Error while renaming dir for " + topicPartition + " in log
dir " + dir.getParent(),
+ () -> {
+ File renamedDir = new File(dir.getParent(), name);
+ Utils.atomicMoveWithFallback(dir.toPath(),
renamedDir.toPath());
+ if (!renamedDir.equals(dir)) {
+ dir = renamedDir;
+ parentDir = renamedDir.getParent();
+ segments.updateParentDir(renamedDir);
+ return true;
+ } else {
+ return false;
+ }
+ }
+ );
+ }
+
+ /**
+ * Update the existing configuration to the new provided configuration.
+ * @param newConfig the new configuration to be updated to
+ */
+ public void updateConfig(LogConfig newConfig) {
+ LogConfig oldConfig = config;
+ config = newConfig;
+ RecordVersion oldRecordVersion = oldConfig.recordVersion();
+ RecordVersion newRecordVersion = newConfig.recordVersion();
+ if (newRecordVersion.precedes(oldRecordVersion)) {
+ logger.warn("Record format version has been downgraded from " +
oldRecordVersion + " to " + newRecordVersion + ".");
+ }
+ }
+
+ public void checkIfMemoryMappedBufferClosed() {
+ if (isMemoryMappedBufferClosed) {
+ throw new KafkaStorageException("The memory mapped buffer for log
of " + topicPartition + " is already closed");
+ }
+ }
+
+ public void updateRecoveryPoint(long newRecoveryPoint) {
+ recoveryPoint = newRecoveryPoint;
+ }
+
+ /**
+ * Update recoveryPoint to provided offset and mark the log as flushed, if
the offset is greater
+ * than the existing recoveryPoint.
+ *
+ * @param offset the offset to be updated
+ */
+ public void markFlushed(long offset) {
+ checkIfMemoryMappedBufferClosed();
+ if (offset > recoveryPoint) {
+ updateRecoveryPoint(offset);
+ lastFlushedTime.set(time.milliseconds());
+ }
+ }
+
+ /**
+ * The number of messages appended to the log since the last flush
+ */
+ public long unflushedMessages() {
+ return logEndOffset() - recoveryPoint;
+ }
+
+ /**
+ * Flush local log segments for all offsets up to offset-1.
+ * Does not update the recovery point.
+ *
+ * @param offset The offset to flush up to (non-inclusive)
+ */
+ public void flush(long offset) throws IOException {
+ long currentRecoveryPoint = recoveryPoint;
+ if (currentRecoveryPoint <= offset) {
+ Collection<LogSegment> segmentsToFlush =
segments.values(currentRecoveryPoint, offset);
+ for (LogSegment logSegment : segmentsToFlush) {
+ logSegment.flush();
+ }
+ // If there are any new segments, we need to flush the parent
directory for crash consistency.
+ if (segmentsToFlush.stream().anyMatch(s -> s.baseOffset() >=
currentRecoveryPoint)) {
+ // The directory might be renamed concurrently for topic
deletion, which may cause NoSuchFileException here.
+ // Since the directory is to be deleted anyways, we just
swallow NoSuchFileException and let it go.
+ Utils.flushDirIfExists(dir.toPath());
+ }
+ }
+ }
+
+ /**
+ * The time this log is last known to have been fully flushed to disk
+ */
+ public long lastFlushTime() {
+ return lastFlushedTime.get();
+ }
+
+ /**
+ * The offset metadata of the next message that will be appended to the log
+ */
+ public LogOffsetMetadata logEndOffsetMetadata() {
+ return nextOffsetMetadata;
+ }
+
+ /**
+ * The offset of the next message that will be appended to the log
+ */
+ public long logEndOffset() {
+ return nextOffsetMetadata.messageOffset;
+ }
+
+ /**
+ * Update end offset of the log, and update the recoveryPoint.
+ *
+ * @param endOffset the new end offset of the log
+ */
+ public void updateLogEndOffset(long endOffset) {
+ nextOffsetMetadata = new LogOffsetMetadata(endOffset,
segments.activeSegment().baseOffset(), segments.activeSegment().size());
+ if (recoveryPoint > endOffset) {
+ updateRecoveryPoint(endOffset);
+ }
+ }
+
+ /**
+ * Close file handlers used by log but don't write to disk.
+ * This is called if the log directory is offline.
+ */
+ public void closeHandlers() {
+ segments.closeHandlers();
+ isMemoryMappedBufferClosed = true;
+ }
+
+ /**
+ * Closes the segments of the log.
+ */
+ public void close() {
+ maybeHandleIOException(
+ () -> "Error while renaming dir for " + topicPartition + " in dir
" + dir.getParent(),
+ () -> {
+ checkIfMemoryMappedBufferClosed();
+ segments.close();
+ return null;
+ }
+ );
+ }
+
+ /**
+ * Completely delete this log directory with no delay.
+ */
+ public void deleteEmptyDir() {
+ maybeHandleIOException(
+ () -> "Error while deleting dir for " + topicPartition + " in dir
" + dir.getParent(),
+ () -> {
+ if (!segments.isEmpty()) {
+ throw new IllegalStateException("Can not delete directory
when " + segments.numberOfSegments() + " segments are still present");
+ }
+ if (!isMemoryMappedBufferClosed) {
+ throw new IllegalStateException("Can not delete directory
when memory mapped buffer for log of " + topicPartition + " is still open.");
+ }
+ Utils.delete(dir);
+ return null;
+ }
+ );
+ }
+
+ /**
+ * Completely delete all segments with no delay.
+ * @return the deleted segments
+ */
+ public List<LogSegment> deleteAllSegments() {
+ return maybeHandleIOException(
+ () -> "Error while deleting all segments for $topicPartition in
dir ${dir.getParent}",
+ () -> {
+ List<LogSegment> deletableSegments = new
ArrayList<>(segments.values());
+ removeAndDeleteSegments(segments.values(), false, new
LogDeletion(logger));
+ isMemoryMappedBufferClosed = true;
+ return deletableSegments;
+ }
+ );
+ }
+
+ /**
+ * This method deletes the given log segments by doing the following for
each of them:
+ * <ul>
+ * <li>It removes the segment from the segment map so that it will no
longer be used for reads.
+ * <li>It renames the index and log files by appending .deleted to the
respective file name
+ * <li>It can either schedule an asynchronous delete operation to occur
in the future or perform the deletion synchronously
+ * </ul>
+ * Asynchronous deletion allows reads to happen concurrently without
synchronization and without the possibility of
+ * physically deleting a file while it is being read.
+ * This method does not convert IOException to KafkaStorageException, the
immediate caller
+ * is expected to catch and handle IOException.
+ *
+ * @param segmentsToDelete The log segments to schedule for deletion
+ * @param asyncDelete Whether the segment files should be deleted
asynchronously
+ * @param reason The reason for the segment deletion
+ */
+ public void removeAndDeleteSegments(Collection<LogSegment>
segmentsToDelete,
+ boolean asyncDelete,
+ SegmentDeletionReason reason) throws
IOException {
+ if (!segmentsToDelete.isEmpty()) {
+ // Most callers hold an iterator into the `segments` collection
and `removeAndDeleteSegment` mutates it by
+ // removing the deleted segment, we should force materialization
of the iterator here, so that results of the
+ // iteration remain valid and deterministic. We should also pass
only the materialized view of the
+ // iterator to the logic that actually deletes the segments.
+ List<LogSegment> toDelete = new ArrayList<>(segmentsToDelete);
+ reason.logReason(toDelete);
+ toDelete.forEach(segment -> segments.remove(segment.baseOffset()));
+ deleteSegmentFiles(toDelete, asyncDelete, dir, topicPartition,
config, scheduler, logDirFailureChannel, logIdent);
+ }
+ }
+
+ /**
+ * This method deletes the given segment and creates a new segment with
the given new base offset. It ensures an
+ * active segment exists in the log at all times during this process.
+ * <br/>
+ * Asynchronous deletion allows reads to happen concurrently without
synchronization and without the possibility of
+ * physically deleting a file while it is being read.
+ * <br/>
+ * This method does not convert IOException to KafkaStorageException, the
immediate caller
+ * is expected to catch and handle IOException.
+ *
+ * @param newOffset The base offset of the new segment
+ * @param segmentToDelete The old active segment to schedule for deletion
+ * @param asyncDelete Whether the segment files should be deleted
asynchronously
+ * @param reason The reason for the segment deletion
+ */
+ public LogSegment createAndDeleteSegment(long newOffset,
+ LogSegment segmentToDelete,
+ boolean asyncDelete,
+ SegmentDeletionReason reason)
throws IOException {
+ if (newOffset == segmentToDelete.baseOffset()) {
+ segmentToDelete.changeFileSuffixes("",
LogFileUtils.DELETED_FILE_SUFFIX);
+ }
+ LogSegment newSegment = LogSegment.open(dir,
+ newOffset,
+ config,
+ time,
+ config.initFileSize(),
+ config.preallocate);
+ segments.add(newSegment);
+
+ reason.logReason(singletonList(segmentToDelete));
+ if (newOffset != segmentToDelete.baseOffset()) {
+ segments.remove(segmentToDelete.baseOffset());
+ }
+ deleteSegmentFiles(singletonList(segmentToDelete), asyncDelete, dir,
topicPartition, config, scheduler, logDirFailureChannel, logIdent);
+ return newSegment;
+ }
+
+ /**
+ * Given a message offset, find its corresponding offset metadata in the
log.
+ * If the message offset is out of range, throw an
OffsetOutOfRangeException
+ */
+ public LogOffsetMetadata convertToOffsetMetadataOrThrow(long offset)
throws IOException {
+ FetchDataInfo fetchDataInfo = read(offset, 1, false,
nextOffsetMetadata, false);
+ return fetchDataInfo.fetchOffsetMetadata;
+ }
+
+ /**
+ * Read messages from the log.
+ *
+ * @param startOffset The offset to begin reading at
+ * @param maxLength The maximum number of bytes to read
+ * @param minOneMessage If this is true, the first message will be
returned even if it exceeds `maxLength` (if one exists)
+ * @param maxOffsetMetadata The metadata of the maximum offset to be
fetched
+ * @param includeAbortedTxns If true, aborted transactions are included
+ * @throws OffsetOutOfRangeException If startOffset is beyond the log end
offset
+ * @return The fetch data information including fetch starting offset
metadata and messages read.
+ */
+ public FetchDataInfo read(long startOffset,
+ int maxLength,
+ boolean minOneMessage,
+ LogOffsetMetadata maxOffsetMetadata,
+ boolean includeAbortedTxns) throws IOException {
+ return maybeHandleIOException(
+ () -> "Exception while reading from " + topicPartition + " in
dir " + dir.getParent(),
+ () -> {
+ logger.trace("Reading maximum $maxLength bytes at offset "
+ startOffset + " from log with " +
+ "total length " + segments.sizeInBytes() + "
bytes");
+
+ LogOffsetMetadata endOffsetMetadata = nextOffsetMetadata;
+ long endOffset = endOffsetMetadata.messageOffset;
+ Optional<LogSegment> segmentOpt =
segments.floorSegment(startOffset);
+ // return error on attempt to read beyond the log end
offset
+ if (startOffset > endOffset || segmentOpt.isEmpty()) {
+ throw new OffsetOutOfRangeException("Received request
for offset " + startOffset + " for partition " + topicPartition + ", " +
+ "but we only have log segments upto " +
endOffset + ".");
+ }
+ if (startOffset == maxOffsetMetadata.messageOffset) {
+ return emptyFetchDataInfo(maxOffsetMetadata,
includeAbortedTxns);
+ } else if (startOffset > maxOffsetMetadata.messageOffset) {
+ return
emptyFetchDataInfo(convertToOffsetMetadataOrThrow(startOffset),
includeAbortedTxns);
+ } else {
+ // Do the read on the segment with a base offset less
than the target offset
+ // but if that segment doesn't contain any messages
with an offset greater than that
+ // continue to read from successive segments until we
get some messages or we reach the end of the log
+ FetchDataInfo fetchDataInfo = null;
+ while (fetchDataInfo == null &&
segmentOpt.isPresent()) {
+ LogSegment segment = segmentOpt.get();
+ long baseOffset = segment.baseOffset();
+
+ // 1. If `maxOffsetMetadata#segmentBaseOffset <
segment#baseOffset`, then return maxPosition as empty.
+ // 2. Use the max-offset position if it is on this
segment; otherwise, the segment size is the limit.
+ // 3. When maxOffsetMetadata is
message-offset-only, then we don't know the relativePositionInSegment so
+ // return maxPosition as empty to avoid reading
beyond the max-offset
+ Optional<Long> maxPositionOpt;
+ if (segment.baseOffset() <
maxOffsetMetadata.segmentBaseOffset)
+ maxPositionOpt = Optional.of((long)
segment.size());
+ else if (segment.baseOffset() ==
maxOffsetMetadata.segmentBaseOffset && !maxOffsetMetadata.messageOffsetOnly())
+ maxPositionOpt = Optional.of((long)
maxOffsetMetadata.relativePositionInSegment);
+ else
+ maxPositionOpt = Optional.empty();
+
+ fetchDataInfo = segment.read(startOffset,
maxLength, maxPositionOpt, minOneMessage);
+ if (fetchDataInfo != null) {
+ if (includeAbortedTxns) {
+ fetchDataInfo =
addAbortedTransactions(startOffset, segment, fetchDataInfo);
+ }
+ } else {
+ segmentOpt =
segments.higherSegment(baseOffset);
+ }
+ }
+
+ if (fetchDataInfo != null) {
+ return fetchDataInfo;
+ } else {
+ // okay we are beyond the end of the last segment
with no data fetched although the start offset is in range,
+ // this can happen when all messages with offset
larger than start offsets have been deleted.
+ // In this case, we will return the empty set with
log end offset metadata
+ return new FetchDataInfo(nextOffsetMetadata,
MemoryRecords.EMPTY);
+ }
+ }
+ }
+ );
+ }
+
+ public void append(long lastOffset, long largestTimestamp, long
shallowOffsetOfMaxTimestamp, MemoryRecords records) throws IOException {
+ segments.activeSegment().append(lastOffset, largestTimestamp,
shallowOffsetOfMaxTimestamp, records);
+ updateLogEndOffset(lastOffset + 1);
+ }
+
+ FetchDataInfo addAbortedTransactions(long startOffset, LogSegment segment,
FetchDataInfo fetchInfo) throws IOException {
+ int fetchSize = fetchInfo.records.sizeInBytes();
+ OffsetPosition startOffsetPosition = new OffsetPosition(
+ fetchInfo.fetchOffsetMetadata.messageOffset,
+ fetchInfo.fetchOffsetMetadata.relativePositionInSegment);
+ long upperBoundOffset =
segment.fetchUpperBoundOffset(startOffsetPosition, fetchSize)
+ .orElse(segments.higherSegment(segment.baseOffset())
+ .map(LogSegment::baseOffset).orElse(logEndOffset()));
+
+ List<FetchResponseData.AbortedTransaction> abortedTransactions = new
ArrayList<>();
+ Consumer<List<AbortedTxn>> accumulator = abortedTxns -> {
+ for (AbortedTxn abortedTxn : abortedTxns)
+ abortedTransactions.add(abortedTxn.asAbortedTransaction());
+ };
+ collectAbortedTransactions(startOffset, upperBoundOffset, segment,
accumulator);
+ return new FetchDataInfo(fetchInfo.fetchOffsetMetadata,
+ fetchInfo.records,
+ fetchInfo.firstEntryIncomplete,
+ Optional.of(abortedTransactions));
+ }
+
+ private void collectAbortedTransactions(long startOffset, long
upperBoundOffset,
+ LogSegment startingSegment,
+ Consumer<List<AbortedTxn>>
accumulator) {
+ Iterator<LogSegment> higherSegments =
segments.higherSegments(startingSegment.baseOffset()).iterator();
+ Optional<LogSegment> segmentEntryOpt = Optional.of(startingSegment);
+ while (segmentEntryOpt.isPresent()) {
+ LogSegment segment = segmentEntryOpt.get();
+ TxnIndexSearchResult searchResult =
segment.collectAbortedTxns(startOffset, upperBoundOffset);
+ accumulator.accept(searchResult.abortedTransactions);
+ if (searchResult.isComplete) return;
+ segmentEntryOpt = nextItem(higherSegments);
+ }
+ }
+
+ public List<AbortedTxn> collectAbortedTransactions(long logStartOffset,
long baseOffset, long upperBoundOffset) {
+ Optional<LogSegment> segmentEntry = segments.floorSegment(baseOffset);
+ List<AbortedTxn> allAbortedTxns = new ArrayList<>();
+ segmentEntry.ifPresent(logSegment ->
collectAbortedTransactions(logStartOffset, upperBoundOffset, logSegment,
allAbortedTxns::addAll));
+ return allAbortedTxns;
+ }
+
+ /**
+ * Roll the log over to a new active segment starting with the current
logEndOffset.
+ * This will trim the index to the exact size of the number of entries it
currently contains.
+ *
+ * @param expectedNextOffset The expected next offset after the segment is
rolled
+ *
+ * @return The newly rolled segment
+ */
+ public LogSegment roll(Optional<Long> expectedNextOffset) {
+ return maybeHandleIOException(
+ () -> "Error while rolling log segment for " + topicPartition + "
in dir " + dir.getParent(),
+ () -> {
+ long start = time.hiResClockMs();
+ checkIfMemoryMappedBufferClosed();
+ long newOffset = Math.max(expectedNextOffset.orElse(0L),
logEndOffset());
+ File logFile = LogFileUtils.logFile(dir, newOffset, "");
+ LogSegment activeSegment = segments.activeSegment();
+ if (segments.contains(newOffset)) {
+ // segment with the same base offset already exists and
loaded
+ if (activeSegment.baseOffset() == newOffset &&
activeSegment.size() == 0) {
+ // We have seen this happen (see KAFKA-6388) after
shouldRoll() returns true for an
+ // active segment of size zero because of one of the
indexes is "full" (due to _maxEntries == 0).
+ logger.warn("Trying to roll a new log segment with
start offset " + newOffset +
+ "=max(provided offset = " + expectedNextOffset
+ ", LEO = " + logEndOffset() + ") while it already " +
+ "exists and is active with size 0. Size of
time index: " + activeSegment.timeIndex().entries() +
+ ", size of offset index: " +
activeSegment.offsetIndex().entries() + ".");
+ LogSegment newSegment =
createAndDeleteSegment(newOffset, activeSegment, true, new LogRoll(logger));
+ updateLogEndOffset(nextOffsetMetadata.messageOffset);
+ logger.info("Rolled new log segment at offset " +
newOffset + " in " + (time.hiResClockMs() - start) + " ms.");
+ return newSegment;
+ } else {
+ throw new KafkaException("Trying to roll a new log
segment for topic partition " + topicPartition + " with start offset " +
newOffset +
+ " =max(provided offset = " +
expectedNextOffset + ", LEO = " + logEndOffset() + ") while it already exists.
Existing " +
+ "segment is " + segments.get(newOffset) + ".");
+ }
+ } else if (!segments.isEmpty() && newOffset <
activeSegment.baseOffset()) {
+ throw new KafkaException(
+ "Trying to roll a new log segment for topic
partition " + topicPartition + " with " +
+ "start offset " + newOffset + " =max(provided
offset = " + expectedNextOffset + ", LEO = " + logEndOffset() + ") lower than
start offset of the active segment " + activeSegment);
+ } else {
+ File offsetIdxFile = LogFileUtils.offsetIndexFile(dir,
newOffset);
+ File timeIdxFile = LogFileUtils.timeIndexFile(dir,
newOffset);
+ File txnIdxFile = LogFileUtils.transactionIndexFile(dir,
newOffset);
+ for (File file : Arrays.asList(logFile, offsetIdxFile,
timeIdxFile, txnIdxFile)) {
+ if (file.exists()) {
+ logger.warn("Newly rolled segment file " +
file.getAbsolutePath() + " already exists; deleting it first");
+ Files.delete(file.toPath());
+ }
+ }
+ if (segments.lastSegment().isPresent()) {
+ segments.lastSegment().get().onBecomeInactiveSegment();
+ }
+ }
+ LogSegment newSegment = LogSegment.open(dir,
+ newOffset,
+ config,
+ time,
+ config.initFileSize(),
+ config.preallocate);
+ segments.add(newSegment);
+
+ // We need to update the segment base offset and append
position data of the metadata when log rolls.
+ // The next offset should not change.
+ updateLogEndOffset(nextOffsetMetadata.messageOffset);
+ logger.info("Rolled new log segment at offset " + newOffset +
" in " + (time.hiResClockMs() - start) + " ms.");
+ return newSegment;
+ }
+ );
+ }
+
+ /**
+ * Delete all data in the local log and start at the new offset.
+ *
+ * @param newOffset The new offset to start the log with
+ * @return the list of segments that were scheduled for deletion
+ */
+ public List<LogSegment> truncateFullyAndStartAt(long newOffset) {
+ return maybeHandleIOException(
+ () -> "Error while truncating the entire log for " +
topicPartition + " in dir " + dir.getParent(),
+ () -> {
+ logger.debug("Truncate and start at offset " + newOffset);
+ checkIfMemoryMappedBufferClosed();
+ List<LogSegment> segmentsToDelete = new
ArrayList<>(segments.values());
+
+ if (!segmentsToDelete.isEmpty()) {
+ removeAndDeleteSegments(segmentsToDelete.subList(0,
segmentsToDelete.size() - 1), true, new LogTruncation(logger));
+ // Use createAndDeleteSegment() to create new segment
first and then delete the old last segment to prevent missing
+ // active segment during the deletion process
+ createAndDeleteSegment(newOffset,
segmentsToDelete.get(segmentsToDelete.size() - 1), true, new
LogTruncation(logger));
+ }
+ updateLogEndOffset(newOffset);
+ return segmentsToDelete;
+ }
+ );
+ }
+
+ /**
+ * Truncate this log so that it ends with the greatest offset <
targetOffset.
+ *
+ * @param targetOffset The offset to truncate to, an upper bound on all
offsets in the log after truncation is complete.
+ * @return the list of segments that were scheduled for deletion
+ */
+ public Collection<LogSegment> truncateTo(long targetOffset) throws
IOException {
+ Collection<LogSegment> deletableSegments = segments.filter(segment ->
segment.baseOffset() > targetOffset);
+ removeAndDeleteSegments(deletableSegments, true, new
LogTruncation(logger));
+ segments.activeSegment().truncateTo(targetOffset);
+ updateLogEndOffset(targetOffset);
+ return deletableSegments;
+ }
+
+ /**
+ * Return a directory name to rename the log directory to for async
deletion.
+ * The name will be in the following format:
"topic-partitionId.uniqueId-delete".
+ * If the topic name is too long, it will be truncated to prevent the
total name
+ * from exceeding 255 characters.
+ */
+ public static String logDeleteDirName(TopicPartition topicPartition) {
+ return logDirNameWithSuffixCappedLength(topicPartition,
LogFileUtils.DELETE_DIR_SUFFIX);
+ }
+
+ /**
+ * Return a directory name to rename the log directory to for stray
partition deletion.
+ * The name will be in the following format:
"topic-partitionId.uniqueId-stray".
+ * If the topic name is too long, it will be truncated to prevent the
total name
+ * from exceeding 255 characters.
+ */
+ public static String logStrayDirName(TopicPartition topicPartition) {
+ return logDirNameWithSuffixCappedLength(topicPartition,
LogFileUtils.STRAY_DIR_SUFFIX);
+ }
+
+ /**
+ * Return a future directory name for the given topic partition. The name
will be in the following
+ * format: topic-partition.uniqueId-future where topic, partition and
uniqueId are variables.
+ */
+ public static String logFutureDirName(TopicPartition topicPartition) {
+ return logDirNameWithSuffix(topicPartition,
LogFileUtils.FUTURE_DIR_SUFFIX);
+ }
+
+ /**
+ * Return a new directory name in the following format:
"${topic}-${partitionId}.${uniqueId}${suffix}".
+ * If the topic name is too long, it will be truncated to prevent the
total name
+ * from exceeding 255 characters.
+ */
+ private static String logDirNameWithSuffixCappedLength(TopicPartition
topicPartition, String suffix) {
+ String uniqueId = UUID.randomUUID().toString().replaceAll("-", "");
+ String fullSuffix = "-" + topicPartition.partition() + "." + uniqueId
+ suffix;
+ int prefixLength = Math.min(topicPartition.topic().length(), 255 -
fullSuffix.length());
+ return topicPartition.topic().substring(0, prefixLength) + fullSuffix;
+ }
+
+ private static String logDirNameWithSuffix(TopicPartition topicPartition,
String suffix) {
+ String uniqueId = UUID.randomUUID().toString().replaceAll("-", "");
+ return logDirName(topicPartition) + "." + uniqueId + suffix;
+ }
+
+ /**
+ * Return a directory name for the given topic partition. The name will be
in the following
+ * format: topic-partition where topic, partition are variables.
+ */
+ public static String logDirName(TopicPartition topicPartition) {
+ return topicPartition.topic() + "-" + topicPartition.partition();
+ }
+
+ private static KafkaException exception(File dir) throws IOException {
+ return new KafkaException("Found directory " + dir.getCanonicalPath()
+ ", '" + dir.getName() + "' is not in the form of " +
+ "topic-partition or topic-partition.uniqueId-delete (if marked
for deletion).\n" +
+ "Kafka's log directories (and children) should only contain
Kafka topic data.");
+ }
+
+ /**
+ * Parse the topic and partition out of the directory name of a log
+ */
+ public static TopicPartition parseTopicPartitionName(File dir) throws
IOException {
+ if (dir == null) {
+ throw new KafkaException("dir should not be null");
+ }
+ String dirName = dir.getName();
+ if (dirName.isEmpty() || !dirName.contains("-")) {
Review Comment:
I assumed it's an optimization to potentially avoid running `contains()`, so
decided to keep it just in case.
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