ConfX created HDFS-17189:
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Summary: GcTimeMonitor crashes with NegativeArraySizeException
during initialization
Key: HDFS-17189
URL: https://issues.apache.org/jira/browse/HDFS-17189
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 3.3.6
Reporter: ConfX
The garbage collection data buffer size equals to
`dfs.namenode.gc.time.monitor.observation.window.ms` divided by
`dfs.namenode.gc.time.monitor.sleep.interval.ms` plus 2. When the observation
window is a large value, the caculation overflows, resulting in a negative
buffer size.
To reproduce:
1. set `dfs.namenode.gc.time.monitor.observation.window.ms` to 945099495m
2. run `mvn surefire:test
-Dtest=org.apache.hadoop.hdfs.TestHDFSFileSystemContract#testWriteReadAndDeleteHalfABlock`
This PR provides a fix by checking the computed buffer size is not only within
`128 * 1024` but also greater than 0.
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