Eric Sirianni created HDFS-5769:
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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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