Lei (Eddy) Xu created HDFS-7332:
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Summary: Fix TestMultipleNNDataBlockScanner failures in jenkin
slaves.
Key: HDFS-7332
URL: https://issues.apache.org/jira/browse/HDFS-7332
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Affects Versions: 2.5.1
Reporter: Lei (Eddy) Xu
Assignee: Lei (Eddy) Xu
{{BlockPoolSliceScanner}} sorts {{BlockScanInfo}} by its {{lastScanTime}}. Each
time, the scanner picks a {{BlockScanInfo}} with the smallest {{lastScanTime}}
to scan and then updates its {{lastScanTime = Time.mononicNow()}}.
Since the Jenkins test slave VM is usually rebooted for each job, the
{{Time.mononicNow()}} in the VM returns a small number, which is smaller than
the initial values of {{BlockScanInfo}}. Thus {{BlockPoolSliceScanner}} stops
at the first block that has been scanned and could not finish scanning all
blocks. The result of it is that
{{TestMultipleNNDataBlockScanner#testDataBlockScanner}} times out due to
unfinished scanning job.
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