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[8.12] Mention IndexFormatToo{Old,New}Exception as corruption (#104204) #104207

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Jan 10, 2024
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[8.12] Mention IndexFormatToo{Old,New}Exception as corruption (#104204) #104207

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10 changes: 8 additions & 2 deletions docs/reference/troubleshooting/corruption-issues.asciidoc
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Expand Up @@ -38,6 +38,13 @@ well-tested, so you can be very confident that a checksum mismatch really does
indicate that the data read from disk is different from the data that {es}
previously wrote.

If a file header is corrupted then it's possible that {es} might not be able
to work out how to even start reading the file which can lead to an exception
such as:

- `org.apache.lucene.index.IndexFormatTooOldException`
- `org.apache.lucene.index.IndexFormatTooNewException`

It is also possible that {es} reports a corruption if a file it needs is
entirely missing, with an exception such as:

Expand All @@ -50,8 +57,7 @@ system previously confirmed to {es} that this file was durably synced to disk.
On Linux this means that the `fsync()` system call returned successfully. {es}
sometimes reports that an index is corrupt because a file needed for recovery
is missing, or it exists but has been truncated or is missing its footer. This
indicates that your storage system acknowledges durable writes incorrectly or
that some external process has modified the data {es} previously wrote to disk.
may indicate that your storage system acknowledges durable writes incorrectly.

There are many possible explanations for {es} detecting corruption in your
cluster. Databases like {es} generate a challenging I/O workload that may find
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