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From "Nic Eggert (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-1136) Giraph no longer checkpoints loading input
Date Thu, 16 Mar 2017 15:54:41 GMT
Nic Eggert created GIRAPH-1136:
----------------------------------

             Summary: Giraph no longer checkpoints loading input
                 Key: GIRAPH-1136
                 URL: https://issues.apache.org/jira/browse/GIRAPH-1136
             Project: Giraph
          Issue Type: Bug
          Components: bsp
    Affects Versions: 1.2.0
            Reporter: Nic Eggert


>From Practical Analytics with Apache Giraph:
{quote}
If checkpoints are enabled, you are guaranteed to have the initial graph data safely stored
in HDFS.
{quote}

Looking at the current code in {{o.a.g.master.BspServiceMaster:getCheckpointStatus}}, it looks
like this is no longer the case. After a little bit of digging, it looks like this change
was introduced here: https://github.com/apache/giraph/commit/5adca63deca25d84f4fdea053c35a85efc8bbb3d#diff-e16fdec9e3f573eba64cfe6eab512e19L657
(GIRAPH-993)

Was this change intentional? It seems like an initial checkpoint would be desirable (I have
a job where 1/3 of the runtime is spent loading input splits).

The simplest fix would be to just add a special case for Superstep 0. If that's acceptable,
I'd be happy to submit a PR.



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