Andy Isaacson created HDFS-3913:
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Summary: Refactor DataBlockScanner and clean up tests
Key: HDFS-3913
URL: https://issues.apache.org/jira/browse/HDFS-3913
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.0.1-alpha
Reporter: Andy Isaacson
Priority: Minor
In HDFS-3828 Eli observed
bq. In getTotalScans rather than throw IOE if given a bpid w/o a scanner I
believe this should be an assert (we should always have a scanner for a block
pool if we've enbabled scanning, which we have if we're in DataBlockScanner)
and Andy suggested
bq. we could propagate a "please wake me up at time T" up from
BlockPoolSliceScanner to DataBlockScanner#run and adjust the sleep time there,
accordingly. If all threadpools continue to have work to do, then preserve the
existing 5-second sleep; if all threadpools are done working then
DataBlockScanner could go to sleep for much longer.
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