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Posted to dev@giraph.apache.org by "Nic Eggert (JIRA)" <ji...@apache.org> on 2017/03/16 15:54:41 UTC

[jira] [Created] (GIRAPH-1136) Giraph no longer checkpoints loading input

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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