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From "Dave Revell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6358) Bulkloading from remote filesystem is problematic
Date Mon, 09 Jul 2012 21:50:35 GMT
Dave Revell created HBASE-6358:

             Summary: Bulkloading from remote filesystem is problematic
                 Key: HBASE-6358
                 URL: https://issues.apache.org/jira/browse/HBASE-6358
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.94.0
            Reporter: Dave Revell
            Assignee: Dave Revell

Bulk loading hfiles that don't live on the same filesystem as HBase can cause problems for
subtle reasons.

In Store.bulkLoadHFile(), the regionserver will copy the source hfile to its own filesystem
if it's not already there. Since this can take a long time for large hfiles, it's likely that
the client will timeout and retry. When the client retries repeatedly, there may be several
bulkload operations in flight for the same hfile, causing lots of unnecessary IO and tying
up handler threads. This can seriously impact performance. In my case, the cluster became
unusable and the regionservers had to be kill -9'ed.

Possible solutions:
 # Require that hfiles already be on the same filesystem as HBase in order for bulkloading
to succeed. The copy could be handled by LoadIncrementalHFiles before the regionserver is
 # Others? I'm not familiar with Hadoop IPC so there may be tricks to extend the timeout or
something else.

I'm willing to write a patch but I'd appreciate recommendations on how to proceed.

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