keith-turner opened a new pull request, #4872:
URL: https://github.com/apache/accumulo/pull/4872
Addes detailed trace logging for the accumulo block caches that can be used
for scans.
With the following log4j config
```
logger.cache.name = org.apache.accumulo.cache
logger.cache.level = trace
```
can see output like the following with these changes when running a few
scans.
```
2024-09-10T23:08:47,821 [accumulo.cache] TRACE: INDEX loader:299585732
getDependencies() returned
[hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rf!RootData]
2024-09-10T23:08:47,828 [accumulo.cache] TRACE: INDEX loader:299585732
load(201326592,{hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rf!RootData=65})
returned 113 bytes in 823μs
2024-09-10T23:08:47,828 [accumulo.cache] TRACE: INDEX
getBlock(hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rfMRFile.index,
loader:299585732) returned 113 bytes in 6924μs
2024-09-10T23:08:47,829 [accumulo.cache] TRACE: DATA
getBlock(hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rfR16,
loader:1259534108) returned 101125 bytes in 865μs
2024-09-10T23:09:00,692 [accumulo.cache] TRACE: DATA
getBlock(hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rfR16,
loader:161430432) returned 101125 bytes in 5μs
2024-09-10T23:09:01,579 [accumulo.cache] TRACE: DATA
getBlock(hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rfR16,
loader:1386294126) returned 101125 bytes in 8μs
2024-09-10T23:09:02,323 [accumulo.cache] TRACE: DATA
getBlock(hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rfR16,
loader:740950152) returned 101125 bytes in 9μs
2024-09-10T23:09:03,011 [accumulo.cache] TRACE: DATA
getBlock(hdfs://localhost:8020/accumulo/tables/1/default_tablet/A000003t.rfR16,
loader:1766289486) returned 101125 bytes in 9μs
```
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