[jira] [Created] (HBASE-12487) Explicitly flush the file name in sweep job

["Jingcheng Du (JIRA)" <ji...@apache.org>]

Jingcheng Du created HBASE-12487:
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             Summary: Explicitly flush the file name in sweep job
                 Key: HBASE-12487
                 URL: https://issues.apache.org/jira/browse/HBASE-12487
             Project: HBase
          Issue Type: Sub-task
    Affects Versions: hbase-11339
            Reporter: Jingcheng Du
            Assignee: Jingcheng Du
             Fix For: hbase-11339


Currently in the implementation of sweeper, we need to remove the mob files that are not referenced by hbase any more.
# List the names of all the existing files and write them to a seq file.
# In each reducer, write the visited mob file names to a seq file.
# After the mapreduce is done, remove the files that are existent in step1 but not in step2 (those are the unused/unreferenced files).

Currently the flush of the writer depends on the IOUtils.closeStream(writer), if this close operation fails silently, the file names won't be written to seq files, some files that are still referenced by hbase will be archived after the mapreduce is finished.
We should explicitly invoke write.hflush() to flush out the user buffer.



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