junrao commented on a change in pull request #10763: URL: https://github.com/apache/kafka/pull/10763#discussion_r659056491
########## File path: core/src/main/scala/kafka/log/LogLoader.scala ########## @@ -90,11 +90,63 @@ object LogLoader extends Logging { * overflow index offset */ def load(params: LoadLogParams): LoadedLogOffsets = { - // first do a pass through the files in the log directory and remove any temporary files + + // First pass: through the files in the log directory and remove any temporary files // and find any interrupted swap operations val swapFiles = removeTempFilesAndCollectSwapFiles(params) - // Now do a second pass and load all the log and index files. + // The remaining valid swap files must come from compaction or segment split operation. We can + // simply rename them to regular segment files. But, before renaming, we should figure out which + // segments are compacted and delete these segment files: this is done by calculating min/maxSwapFileOffset. + // We store segments that require renaming in this code block, and do the actual renaming later. + var minSwapFileOffset = Long.MaxValue + var maxSwapFileOffset = Long.MinValue + val toRenameSwapFiles = mutable.Set[File]() + swapFiles.filter(f => Log.isLogFile(new File(CoreUtils.replaceSuffix(f.getPath, SwapFileSuffix, "")))).foreach { f => + val baseOffset = offsetFromFile(f) + val segment = LogSegment.open(f.getParentFile, + baseOffset = baseOffset, + params.config, + time = params.time, + fileSuffix = Log.SwapFileSuffix) + toRenameSwapFiles += f + info(s"${params.logIdentifier}Found log file ${f.getPath} from interrupted swap operation, which is recoverable from ${Log.SwapFileSuffix} files by renaming.") + minSwapFileOffset = Math.min(segment.baseOffset, minSwapFileOffset) + maxSwapFileOffset = Math.max(segment.offsetIndex.lastOffset, maxSwapFileOffset) Review comment: This is an existing problem. Calculating the end offset that a segment covers can be tricky. The problem is that in compaction, we remove records in the .clean and .swap files. So, the offset of the last record in a segment doesn't tell us the true end offset of the original segment. One possibility is to use the base offset of the next segment if present. ########## File path: core/src/main/scala/kafka/log/LogLoader.scala ########## @@ -90,11 +90,63 @@ object LogLoader extends Logging { * overflow index offset */ def load(params: LoadLogParams): LoadedLogOffsets = { - // first do a pass through the files in the log directory and remove any temporary files + + // First pass: through the files in the log directory and remove any temporary files // and find any interrupted swap operations val swapFiles = removeTempFilesAndCollectSwapFiles(params) - // Now do a second pass and load all the log and index files. + // The remaining valid swap files must come from compaction or segment split operation. We can + // simply rename them to regular segment files. But, before renaming, we should figure out which + // segments are compacted and delete these segment files: this is done by calculating min/maxSwapFileOffset. + // We store segments that require renaming in this code block, and do the actual renaming later. + var minSwapFileOffset = Long.MaxValue + var maxSwapFileOffset = Long.MinValue + val toRenameSwapFiles = mutable.Set[File]() + swapFiles.filter(f => Log.isLogFile(new File(CoreUtils.replaceSuffix(f.getPath, SwapFileSuffix, "")))).foreach { f => + val baseOffset = offsetFromFile(f) + val segment = LogSegment.open(f.getParentFile, + baseOffset = baseOffset, + params.config, + time = params.time, + fileSuffix = Log.SwapFileSuffix) + toRenameSwapFiles += f + info(s"${params.logIdentifier}Found log file ${f.getPath} from interrupted swap operation, which is recoverable from ${Log.SwapFileSuffix} files by renaming.") + minSwapFileOffset = Math.min(segment.baseOffset, minSwapFileOffset) + maxSwapFileOffset = Math.max(segment.offsetIndex.lastOffset, maxSwapFileOffset) + } + + // Second pass: delete segments that are between minSwapFileOffset and maxSwapFileOffset. As + // discussed above, these segments were compacted but haven't been renamed to .delete before Review comment: The swap files can also be created during splitting. ########## File path: core/src/main/scala/kafka/log/LogLoader.scala ########## @@ -106,7 +158,14 @@ object LogLoader extends Logging { loadSegmentFiles(params) }) - completeSwapOperations(swapFiles, params) + // Forth pass: rename remaining index swap files. They must be left due to a broker crash when Review comment: Hmm, not sure why we still have swap files at the point. We have renamed all existing swap files and no new swap files are created. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org