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https://issues.apache.org/jira/browse/FLUME-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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chenhongcai updated FLUME-3349:
-------------------------------
Labels: TailDir dataloss (was: )
Status: Patch Available (was: Open)
> TailDir source Data loss
> ------------------------
>
> Key: FLUME-3349
> URL: https://issues.apache.org/jira/browse/FLUME-3349
> Project: Flume
> Issue Type: Bug
> Components: Sinks+Sources
> Affects Versions: 1.9.0, 1.8.0
> Environment: apache-flume-bin-1.8.0
> java-1.8.92
> Reporter: chenhongcai
> Priority: Critical
> Labels: TailDir, dataloss
>
> 如果skipToEnd为{color:red}true{color}，file A 处理正在读取处理中时{color:red}生成file
> B{color},等fileA处理完{color:red}下次{color}处理时file B
> 从{color:red}末尾开始读取{color}，而不是从头读取{color:red}导致数据丢失{color}
> {code:java}
> public List<Long> updateTailFiles(boolean skipToEnd) throws IOException {
> updateTime = System.currentTimeMillis();
> List<Long> updatedInodes = Lists.newArrayList();
> for (TaildirMatcher taildir : taildirCache) {
> Map<String, String> headers = headerTable.row(taildir.getFileGroup());
> for (File f : taildir.getMatchingFiles()) {
> long inode;
> try {
> inode = getInode(f);
> } catch (NoSuchFileException e) {
> logger.info("File has been deleted in the meantime: " +
> e.getMessage());
> continue;
> }
> TailFile tf = tailFiles.get(inode);
> if (tf == null || !tf.getPath().equals(f.getAbsolutePath())) {
> long startPos = skipToEnd ? f.length() : 0;
> tf = openFile(f, headers, inode, startPos);
> } else {
> boolean updated = tf.getLastUpdated() < f.lastModified() ||
> tf.getPos() != f.length();
> if (updated) {
> if (tf.getRaf() == null) {
> tf = openFile(f, headers, inode, tf.getPos());
> }
> if (f.length() < tf.getPos()) {
> logger.info("Pos " + tf.getPos() + " is larger than file size! "
> + "Restarting from pos 0, file: " + tf.getPath() + ",
> inode: " + inode);
> tf.updatePos(tf.getPath(), inode, 0);
> }
> }
> tf.setNeedTail(updated);
> }
> tailFiles.put(inode, tf);
> updatedInodes.add(inode);
> }
> }
> return updatedInodes;
> }
> {code}
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