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https://issues.apache.org/jira/browse/HDFS-12977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16403177#comment-16403177
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Konstantin Shvachko commented on HDFS-12977:
--------------------------------------------
Great! One last thing. Out of those [checkstyle
warnings|https://builds.apache.org/job/PreCommit-HDFS-Build/23527/artifact/out/diff-checkstyle-root.txt]
from last build, the last one actually worth fixing:
{code:java}
./hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java:219:
volatile long lastSeenStateId;:17: Variable 'lastSeenStateId' must be private
and have accessor methods. [VisibilityModifier]{code}
> Add stateId to RPC headers.
> ---------------------------
>
> Key: HDFS-12977
> URL: https://issues.apache.org/jira/browse/HDFS-12977
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ipc, namenode
> Reporter: Konstantin Shvachko
> Assignee: Plamen Jeliazkov
> Priority: Major
> Attachments: HDFS_12977.trunk.001.patch, HDFS_12977.trunk.002.patch,
> HDFS_12977.trunk.003.patch, HDFS_12977.trunk.004.patch,
> HDFS_12977.trunk.005.patch, HDFS_12977.trunk.006.patch,
> HDFS_12977.trunk.007.patch, HDFS_12977.trunk.008.patch
>
>
> stateId is a new field in the RPC headers of NameNode proto calls.
> stateId is the journal transaction Id, which represents LastSeenId for the
> clients and LastWrittenId for NameNodes. See more in [reads from Standby
> design
> doc|https://issues.apache.org/jira/secure/attachment/12902925/ConsistentReadsFromStandbyNode.pdf].
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