[GitHub] [iotdb] neuyilan commented on a change in pull request #1956: [Distributed] bug fix, remove the persist logs when follower receives a snapshot

[GitBox <gi...@apache.org>]

neuyilan commented on a change in pull request #1956:
URL: https://github.com/apache/iotdb/pull/1956#discussion_r519545236



##########
File path: cluster/src/main/java/org/apache/iotdb/cluster/log/manage/serializable/SyncLogDequeSerializer.java
##########
@@ -835,6 +834,59 @@ public void close() {
     }
   }
 
+  @Override
+  public void clearAllLogs(long commitIndex) {
+    lock.writeLock().lock();
+    try {
+      // 1. delete
+      forceFlushLogBuffer();
+      closeCurrentFile(meta.getCommitLogIndex());
+      for (int i = 0; i < logDataFileList.size(); i++) {
+        deleteLogDataAndIndexFile(i);
+      }
+      deleteMetaFile();
+
+      logDataFileList.clear();
+      logIndexFileList.clear();
+
+      // 2. init
+      if (!logIndexOffsetList.isEmpty()) {
+        this.firstLogIndex = Math
+            .max(commitIndex + 1, firstLogIndex + logIndexOffsetList.size());
+      } else {
+        this.firstLogIndex = commitIndex + 1;
+      }
+      this.logIndexOffsetList.clear();
+      recoverMetaFile();
+      meta = new LogManagerMeta();
+      createNewLogFile(logDir, firstLogIndex);
+      logger.info("{}, clean all logs success, the new firstLogIndex={}", this, firstLogIndex);
+    } catch (IOException e) {
+      logger.error("clear all logs failed,", e);
+    } finally {
+      lock.writeLock().unlock();
+    }
+  }
+
+  private void deleteMetaFile() {
+    lock.writeLock().lock();
+    try {
+      File tmpMetaFile = SystemFileFactory.INSTANCE.getFile(logDir + "logMeta.tmp");
+      if (tmpMetaFile.exists()) {
+        Files.delete(tmpMetaFile.toPath());
+      }

Review comment:
       got it, thanks




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