fixes file count issue w/ bulk import random walk test #297
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Running bulk import test failed with the following error.
```
2025-08-29T00:44:43,285 [randomwalk.bulk.BulkMinusOne] ERROR: java.lang.IllegalStateException: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: The file hdfs://localhost:8020/tmp/bulk_ab3612b1-ef53-4cd5-8c28
-7dd75de47c87/part_0.rf attempted to import to 122 tablets. Max tablets allowed set to 100
java.lang.IllegalStateException: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: The file hdfs://localhost:8020/tmp/bulk_ab3612b1-ef53-4cd5-8c28-7dd75de47c87/part_0.rf attempted to import to 122 tablets. Max tablets allowed set to 100
at org.apache.accumulo.core.clientImpl.bulk.BulkImport.computeFileToTabletMappings(BulkImport.java:591) ~[accumulo-testing-shaded.jar:?]
at org.apache.accumulo.core.clientImpl.bulk.BulkImport.computeMappingFromFiles(BulkImport.java:499) ~[accumulo-testing-shaded.jar:?]
at org.apache.accumulo.core.clientImpl.bulk.BulkImport.load(BulkImport.java:155) ~[accumulo-testing-shaded.jar:?]
at org.apache.accumulo.testing.randomwalk.bulk.BulkPlusOne.bulkLoadLots(BulkPlusOne.java:98) ~[accumulo-testing-shaded.jar:?]
at org.apache.accumulo.testing.randomwalk.bulk.BulkMinusOne.runLater(BulkMinusOne.java:34) ~[accumulo-testing-shaded.jar:?]
at org.apache.accumulo.testing.randomwalk.bulk.BulkTest.lambda$visit$0(BulkTest.java:33) ~[accumulo-testing-shaded.jar:?]
at org.apache.accumulo.core.trace.TraceWrappedRunnable.run(TraceWrappedRunnable.java:52) [accumulo-testing-shaded.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) [?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
at org.apache.accumulo.core.trace.TraceWrappedRunnable.run(TraceWrappedRunnable.java:52) [accumulo-testing-shaded.jar:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [?:?]
at org.apache.accumulo.core.trace.TraceWrappedRunnable.run(TraceWrappedRunnable.java:52) [accumulo-testing-shaded.jar:?]
at java.lang.Thread.run(Thread.java:840) [?:?]
Caused by: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: The file hdfs://localhost:8020/tmp/bulk_ab3612b1-ef53-4cd5-8c28-7dd75de47c87/part_0.rf attempted to import to 122 tablets. Max tablets allowed set
to 100
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396) ~[?:?]
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073) ~[?:?]
at org.apache.accumulo.core.clientImpl.bulk.BulkImport.computeFileToTabletMappings(BulkImport.java:585) ~[accumulo-testing-shaded.jar:?]
... 13 more
Caused by: java.lang.IllegalArgumentException: The file hdfs://localhost:8020/tmp/bulk_ab3612b1-ef53-4cd5-8c28-7dd75de47c87/part_0.rf attempted to import to 122 tablets. Max tablets allowed set to 100
at org.apache.accumulo.core.clientImpl.bulk.BulkImport.checkTabletCount(BulkImport.java:627) ~[accumulo-testing-shaded.jar:?]
at org.apache.accumulo.core.clientImpl.bulk.BulkImport.lambda$computeFileToTabletMappings$7(BulkImport.java:563) ~[accumulo-testing-shaded.jar:?]
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
... 5 more
```
To avoid this adjusted the tablet setting for the max number of files
that can go to a single tablet to 1000. Also fixed the following problems
with the test code that made this problem harder to debug.
* The test schedules lots of background task, but keeps running when
they fail. Made the test exit when it notices a background test
failed. This changes required making a map synchronized.
* Some log messages related to the test bulk import code logged a
marker count that correlates the bulk import w/ data in the table.
This marker count is really important for tracking down bugs w/
missing data, but only a subet of log messages included it. Added
the marker count to all log messages since multiple threads
log messages are interleaved in test output.
Since the test did not immediataly fail when the bulk import call
failed, I assumed all bulk imports were succesful and accumulo lost
data. Looked down the wrong path for a bit, hoping these changes help
avoid that in the future.
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Running bulk import test failed with the following error.
To avoid this adjusted the tablet setting for the max number of files that can go to a single tablet to 1000. Also fixed the following problems with the test code that made this problem harder to debug.
Since the test did not immediataly fail when the bulk import call failed, I assumed all bulk imports were succesful and accumulo lost data. Looked down the wrong path for a bit, hoping these changes help avoid that in the future.