Andrew Wang created HDFS-8681:
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Summary: BlockScanner is incorrectly disabled by default
Key: HDFS-8681
URL: https://issues.apache.org/jira/browse/HDFS-8681
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.7.0
Reporter: Andrew Wang
Assignee: Colin Patrick McCabe
Priority: Critical
This code is used to check whether the block scanner is enabled:
{noformat}
public boolean isEnabled() {
return (conf.scanPeriodMs) > 0 && (conf.targetBytesPerSec > 0);
}
{noformat}
Unfortunately, when this was introduced, we did not change the default scan
period's value of 0, which means by default the BlockScanner is disabled.
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