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Posted to hdfs-dev@hadoop.apache.org by "Andy Isaacson (JIRA)" <ji...@apache.org> on 2012/09/10 23:03:07 UTC

[jira] [Created] (HDFS-3913) Refactor DataBlockScanner and clean up tests

Andy Isaacson created HDFS-3913:
-----------------------------------

             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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