Caideyipi opened a new pull request, #18266:
URL: https://github.com/apache/iotdb/pull/18266
## Description
### Problem
A realtime Pipe with pattern.exclusion can convert InsertNode events into
retained raw tablet events. These events create zero-sized
PipeTabletMemoryBlocks and account for their memory later through forceResize.
Before this change, forceResize checked only the remaining non-floating
memory. It did not apply the tablet/TsFile admission thresholds used by
non-zero initial allocations. Raw tablets could therefore fill the whole
non-floating pool. Once full, the sink batch could not allocate even the small
buffer needed to transfer and release those tablets, causing a memory self-lock
and a frozen RemainingEventCount.
### Fix
Apply the existing tablet/TsFile hard admission thresholds when a typed
data-structure block grows through resize. Normal blocks, including sink batch
buffers, retain the existing total-memory check.
This backpressures raw-tablet production before it exhausts the pool and
leaves memory for downstream transfer and release. It also avoids restoring a
full static reservation for every sink batch.
A package-private constructor accepting IMemoryBlock was added so the memory
policy can be tested with a deterministic, isolated memory pool.
### Tests
Added PipeMemoryManagerResizeTest to verify that:
- tablet growth is rejected after the tablet threshold is reached;
- a normal sink batch can still allocate memory;
- tablet growth resumes after retained tablet memory is released;
- all accounted memory returns to zero.
Executed:
mvn -Ddevelocity.off=true -o test -pl iotdb-core/datanode
-Dtest=PipeMemoryManagerResizeTest,PipeTabletEventPlainBatchTest,TsFileInsertionEventParserTest
Result: 25 tests run, 0 failures, 0 errors, 3 skipped.
<hr>
This PR has:
- [x] been self-reviewed.
- [x] concurrent read
- [x] concurrent write
- [x] added comments explaining the why and the intent of the code wherever
it would not be obvious.
- [x] added unit tests to cover the new code path.
<hr>
##### Key changed/added classes in this PR
- PipeMemoryManager
- PipeMemoryManagerResizeTest
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