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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2228) Region close needs to be fast; e.g. if compacting, abandon it
Date Mon, 15 Feb 2010 05:33:28 GMT
Region close needs to be  fast; e.g. if compacting, abandon it
--------------------------------------------------------------

                 Key: HBASE-2228
                 URL: https://issues.apache.org/jira/browse/HBASE-2228
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack


Over last week or so i've seen slow closes cause regions be off line for a good amount of
time. Just now, i saw a big compaction go into effect because "too many store files".  This
compaction took nearly two minutes on loaded server.  But during this time flushing was held
up.  When the order to close came in (overloaded), we started the close -- so incoming writes
were rejected -- but then we had to wait on the compaction to finish before the close went
ahead... though incoming clients by now are being turned away.  Eventually the compaction
completed and then the held-up flush was allowed run..... 91M in about 5 seconds.  Only now
was the close allowed complete and the region deployed elsewhere.

Another time I saw the flush take a good long time because hdfs was running slow.  Probably
not much we can do about this one but we should at least look into the above.  Interrupt an
ongoing compaction and abandon it... or else keep region open while the compaction is going
on and only when compete, then start up the close (Would require new state of CLOSING keeping
up a progressable with the master).

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