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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11888) Ozone: SCM: allocateBlcok does not set the creationFlag correctly when the open container pool size is greater than 1
Date Fri, 26 May 2017 04:49:04 GMT
Xiaoyu Yao created HDFS-11888:
---------------------------------

             Summary: Ozone: SCM: allocateBlcok does not set the creationFlag correctly when
the open container pool size is greater than 1
                 Key: HDFS-11888
                 URL: https://issues.apache.org/jira/browse/HDFS-11888
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone
    Affects Versions: HDFS-7240
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


SCM BlockManager provision a pool of containers upon block creation request that can't be
satisfied with current open containers in the pool. However, only one container is returned
with the creationFlag to the client. The other container provisioned in the same batch will
not have this flag. Client can't assume to use these containers that has not been created
on SCM datanodes, 

This ticket is opened to fix the issue by persist the createContainerNeeded flag for the provisioned
containers. The flag will be eventually cleared by processing container report from datanode
when the container report handler is fully implemented on SCM. 

For now, we will use a default batch size of 1 for ozone.scm.container.provision_batch_size
so that the container will be created on demand upon the first block allocation into the container.




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