update toc for v2

Signed-off-by: Alex Chi <iskyzh@gmail.com>

mini-lsm-book/src/week1-01-memtable.md

@@ -1,3 +1,15 @@
 # Memtables
 
 ![Chapter Overview](./lsm-tutorial/week1-01-overview.svg)
+
+In this chapter, you will:
+
+* Implement memtables based on skiplists.
+* Implement freezing memtable logic.
+* Implement LSM read path `get` for memtables.
+
+## Task 1: SkipList Memtable
+
+## Task 2: Write Path - Freezing a Memtable
+
+## Task 3: Read Path - Get

mini-lsm-book/src/week1-02-merge-iterator.md

@@ -1,3 +1,15 @@
 # Merge Iterator
 
 ![Chapter Overview](./lsm-tutorial/week1-02-overview.svg)
+
+In this chapter, you will:
+
+* Implement memtable iterator.
+* Implement merge iterator.
+* Implement LSM read path `scan` for memtables.
+
+## Task 1: Memtable Iterator
+
+## Task 2: Merge Iterator
+
+## Task 3: Read Path - Scan

mini-lsm-book/src/week1-03-block.md

@@ -1,3 +1,12 @@
 # Block
 
 ![Chapter Overview](./lsm-tutorial/week1-03-overview.svg)
+
+In this chapter, you will:
+
+* Implement SST block encoding.
+* Implement SST block decoding and block iterator.
+
+## Task 1: Block Builder
+
+## Task 2: Block Iterator

mini-lsm-book/src/week1-04-sst.md

@@ -1,3 +1,12 @@
 # Sorted String Table (SST)
 
 ![Chapter Overview](./lsm-tutorial/week1-04-overview.svg)
+
+In this chapter, you will:
+
+* Implement SST encoding and metadata encoding.
+* Implement SST decoding and iterator.
+  
+## Task 1: SST Builder
+
+## Task 2: SST Iterator

mini-lsm-book/src/week1-05-read-path.md

@@ -1,3 +1,15 @@
 # Read Path
 
 ![Chapter Overview](./lsm-tutorial/week1-05-overview.svg)
+
+In this chapter, you will:
+
+* Integrate SST into the LSM read path.
+* Implement LSM read path `get` with SSTs.
+* Implement LSM read path `scan` with SSTs.
+
+## Task 1: Two Merge Iterator
+
+## Task 2: Read Path - Get
+
+## Task 3: Read Path - Scan

mini-lsm-book/src/week1-06-write-path.md

@@ -1,3 +1,12 @@
 # Write Path
 
 ![Chapter Overview](./lsm-tutorial/week1-05-overview.svg)
+
+In this chapter, you will:
+
+* Implement the LSM write path with L0 flush.
+* Implement the logic to correctly update the LSM state.
+
+## Task 1: Flush Memtable to SST
+
+## Task 2: Update the LSM State

mini-lsm-book/src/week1-07-sst-optimizations.md

@@ -3,3 +3,8 @@
 ![Chapter Overview](./lsm-tutorial/week1-07-overview.svg)
 
 at the end of each week, we will have some easy, not important, while interesting things
+
+In this chapter, you will:
+
+* Implement bloom filter on SSTs and integrate into the LSM read path `get`.
+* Implement key compression in SST block format.

mini-lsm-book/src/week2-01-compaction.md

@@ -1,3 +1,9 @@
 # Compaction Implementation
 
 ![Chapter Overview](./lsm-tutorial/week2-01-overview.svg)
+
+In this chapter, you will:
+
+* Implement the compaction logic that combines some files and produces new files.
+* Implement the logic to update the LSM states and manage SST files on the filesystem.
+* Update LSM read path to incorporate the LSM levels.

mini-lsm-book/src/week2-02-simple.md

@@ -1,3 +1,8 @@
 # Simple Compaction Strategy
 
 ![Chapter Overview](./lsm-tutorial/week2-01-overview.svg)
+
+In this chapter, you will:
+
+* Implement a simple leveled compaction strategy and simulate it on the compaction simulator.
+* Start compaction as a background task and implement a compaction trigger in the system.

mini-lsm-book/src/week2-03-tiered.md

@@ -1,3 +1,8 @@
 # Tiered Compaction Strategy
 
 ![Chapter Overview](./lsm-tutorial/week2-01-overview.svg)
+
+In this chapter, you will:
+
+* Implement a tiered compaction strategy and simulate it on the compaction simulator.
+* Incorporate tiered compaction strategy into the system.

mini-lsm-book/src/week2-04-leveled.md

@@ -1,3 +1,8 @@
 # Leveled Compaction Strategy
 
 ![Chapter Overview](./lsm-tutorial/week2-01-overview.svg)
+
+In this chapter, you will:
+
+* Implement a leveled compaction strategy and simulate it on the compaction simulator.
+* Incorporate leveled compaction strategy into the system.

mini-lsm-book/src/week2-05-manifest.md

@@ -1,3 +1,8 @@
 # Manifest
 
 ![Chapter Overview](./lsm-tutorial/week2-05-overview.svg)
+
+In this chapter, you will:
+
+* Implement encoding and decoding of the manifest file.
+* Recover from the manifest when the system restarts.

mini-lsm-book/src/week2-06-wal.md

@@ -1,3 +1,8 @@
 # Write-Ahead Log (WAL)
 
 ![Chapter Overview](./lsm-tutorial/week2-06-overview.svg)
+
+In this chapter, you will:
+
+* Implement encoding and decoding of the write-ahead log file.
+* Recover memtables from the WALs when the system restarts.