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Posted to hdfs-dev@hadoop.apache.org by "Eric Sirianni (JIRA)" <ji...@apache.org> on 2014/01/14 22:19:23 UTC

[jira] [Created] (HDFS-5769) Bootstrap a write pipeline from read-only replicas

Eric Sirianni created HDFS-5769:
-----------------------------------

             Summary: Bootstrap a write pipeline from read-only replicas
                 Key: HDFS-5769
                 URL: https://issues.apache.org/jira/browse/HDFS-5769
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client, namenode
    Affects Versions: 2.4.0
            Reporter: Eric Sirianni


HDFS-1606 added the capability for the {{DFSClient}} to add DataNodes to an existing write pipeline.  HDFS-2832 and HDFS-5318 introduce read-only replicas to HDFS.  This JIRA proposes using the HDFS-1606 {{addDatanode2ExistingPipeline()}} capability to enable recovering in scenarios where only read-only replicas are available (i.e. all read-write replicas are offline).

The following scenarios should be supported:
# _Recovering_ an initial write pipeline with repcount=1 (see HDFS-5434) when the datanode hosting the r/w replica fails (but r/o replicas are available)
# _Constructing_ an append pipeline for a block where the r/w replica is offline (but r/o replicas are available)

In both cases, a pipeline of length 0 can be "bootstrapped" to a pipeline of length 1 using available r/o replicas.



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