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https://issues.apache.org/jira/browse/HDFS-10687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Kace updated HDFS-10687:
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Attachment: HDFS-10467-HDFS-10687-001.patch
Attaching first patch version for review.
This patch contains some overlap code (common dependencies) with HDFS-10630
(Federation State Store). The code compiles as is, but is not functional until
HDFS-10630 is committed.
The Federation membership state API functions are defined in
org.apache.hadoop.hdfs.server.federation.store.FederationMembershipStateStore.java
and are implemented in
org.apache.hadoop.hdfs.server.federation.store.impl.FederationMembershipStateStoreImpl.java.
The primary function of the membership state API is to persist the data
required to identify the most active, or recently active, NN for each
nameservice. This is a key feature for HDFS federation. Individual routers
monitor 1-N namenodes and heartbeat the namenode status into the state store.
The NN heartbeat code is available for review in HDFS-10629. This patch
contains the APIs to query, update and cache the reported state of all NNs in
the cluster.
The additional files pertain to request/response API objects and the protobuf
backing implementation of them.
All comments and feedback are welcome!
> Federation Membership State Store internal APIs
> -----------------------------------------------
>
> Key: HDFS-10687
> URL: https://issues.apache.org/jira/browse/HDFS-10687
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: fs
> Reporter: Inigo Goiri
> Assignee: Jason Kace
> Attachments: HDFS-10467-HDFS-10687-001.patch
>
>
> The Federation Membership State encapsulates the information about the
> Namenodes of each sub-cluster that are participating in Federation. The
> information includes addresses for RPC, Web. This information is stored in
> the State Store and later used by the Router to find data in the federation.
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