update summary for week 2

Signed-off-by: Alex Chi <iskyzh@gmail.com>
skyzh · Jan 20, 2024 · e82ad1d · e82ad1d
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diff --git a/README.md b/README.md
@@ -51,11 +51,13 @@ We are working on a new version of the mini-lsm tutorial that is split into 3 we
 | 2.5            | Manifest                                        | ✅        |              |         |
 | 2.6            | Write-Ahead Log                                 | ✅        |              |         |
 | 2.7            | Batch Write + Checksum                          |          |              |         |
-| 3.1            | Timestamp Encoding + Prefix Bloom Filter        |          |              |         |
-| 3.2            | Snapshot Read                                   |          |              |         |
-| 3.3            | Watermark and Garbage Collection                |          |              |         |
-| 3.4            | Transactions and Optimistic Concurrency Control |          |              |         |
-| 3.5            | Serializable Snapshot Isolation                 |          |              |         |
+| 3.1            | Timestamp Key Encoding + New Block Format       |          |              |         |
+| 3.2            | Prefix Bloom Filter                             |          |              |         |
+| 3.3            | Snapshot Read                                   |          |              |         |
+| 3.4            | Watermark and Garbage Collection                |          |              |         |
+| 3.5            | Transactions and Optimistic Concurrency Control |          |              |         |
+| 3.6            | Serializable Snapshot Isolation                 |          |              |         |
+| 3.7            | TTL (Time-to-Live) Entries                      |          |              |         |
 | 4.1            | Benchmarking                                    |          |              |         |
 | 4.2            | Block Compression                               |          |              |         |
 | 4.3            | Trivial Move and Parallel Compaction            |          |              |         |

diff --git a/mini-lsm-book/src/SUMMARY.md b/mini-lsm-book/src/SUMMARY.md
@@ -38,7 +38,7 @@
   - [Leveled Compaction Strategy](./week2-04-leveled.md)
   - [Manifest](./week2-05-manifest.md)
   - [Write-Ahead Log (WAL)](./week2-06-wal.md)
-  - [Snack Time: Batch Write](./week2-07-batch-write.md)
+  - [Snack Time: Batch Write and Checksums](./week2-07-snacks.md)
 
 - [Week 3: MVCC](./week3-overview.md)
 

diff --git a/mini-lsm-book/src/week2-07-batch-write.md b/mini-lsm-book/src/week2-07-batch-write.md
diff --git a/mini-lsm-book/src/week2-07-snacks.md b/mini-lsm-book/src/week2-07-snacks.md
@@ -0,0 +1,10 @@
+# Batch Write and Checksums
+
+<!-- ![Chapter Overview](./lsm-tutorial/week2-07-overview.svg) -->
+
+at the end of each week, we will have some easy, not important, while interesting things
+
+In this chapter, you will:
+
+* Implement the batch write interface.
+* Add checksums to the blocks, SST metadata, manifest, and WALs.