oneby-wang commented on PR #4607:
URL: https://github.com/apache/bookkeeper/pull/4607#issuecomment-3182824251
Hi, I'm wondering what situation will cause data loss(caused by wrong file
header)? I read the source code, it seems the file header is updated by
BufferedLogChannel.appendLedgersMap() method.
```java
BufferedLogChannel
void appendLedgersMap() throws IOException {
// ...
// Update the headers with the map offset and count of ledgers
ByteBuffer mapInfo = ByteBuffer.allocate(8 + 4);
mapInfo.putLong(ledgerMapOffset);
mapInfo.putInt(numberOfLedgers);
mapInfo.flip();
this.fileChannel.write(mapInfo, LEDGERS_MAP_OFFSET_POSITION);
}
```
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