anishshri-db opened a new pull request, #40770:
URL: https://github.com/apache/spark/pull/40770
### What changes were proposed in this pull request?
Add support for tracking pinned blocks memory usage for RocksDB state store
### Why are the changes needed?
Today we only track total memory usage for RocksDB that comprises of write
buffer, block cache and index/filter blocks. Its also useful to understand
usage of blocks pinned in the cache, potentially due to iterators not releasing
them.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Modified unit tests
```
[info] Run completed in 11 seconds, 964 milliseconds.
[info] Total number of tests run: 5
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 5, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
```
Also, verified that the metrics appear in the custom metrics for state store:
```
"customMetrics" : {
"rocksdbBytesCopied" : 1189,
"rocksdbCommitCheckpointLatency" : 14,
"rocksdbCommitCompactLatency" : 0,
"rocksdbCommitFileSyncLatencyMs" : 150,
"rocksdbCommitFlushLatency" : 15,
"rocksdbCommitPauseLatency" : 0,
"rocksdbCommitWriteBatchLatency" : 4,
"rocksdbFilesCopied" : 1,
"rocksdbFilesReused" : 0,
"rocksdbGetCount" : 6,
"rocksdbGetLatency" : 0,
"rocksdbPinnedBlocksMemoryUsage" : 87,
"rocksdbPutCount" : 1,
"rocksdbPutLatency" : 4,
"rocksdbReadBlockCacheHitCount" : 0,
"rocksdbReadBlockCacheMissCount" : 0,
"rocksdbSstFileSize" : 1189,
"rocksdbTotalBytesRead" : 0,
"rocksdbTotalBytesReadByCompaction" : 0,
"rocksdbTotalBytesReadThroughIterator" : 0,
"rocksdbTotalBytesWritten" : 123,
"rocksdbTotalBytesWrittenByCompaction" : 0,
"rocksdbTotalBytesWrittenByFlush" : 1325,
"rocksdbTotalCompactionLatencyMs" : 0,
"rocksdbWriterStallLatencyMs" : 0,
"rocksdbZipFileBytesUncompressed" : 7283
}
```
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