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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-14272) [SBN read] ObserverReadProxyProvider should sync with active txnID on startup
Date Mon, 25 Feb 2019 23:46:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-14272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Erik Krogen updated HDFS-14272:
-------------------------------
    Attachment:     (was: HDFS-14272.002.patch)

> [SBN read] ObserverReadProxyProvider should sync with active txnID on startup
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-14272
>                 URL: https://issues.apache.org/jira/browse/HDFS-14272
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: tools
>         Environment: CDH6.1 (Hadoop 3.0.x) + Consistency Reads from Standby + SSL + Kerberos
+ RPC encryption
>            Reporter: Wei-Chiu Chuang
>            Assignee: Erik Krogen
>            Priority: Major
>         Attachments: HDFS-14272.000.patch, HDFS-14272.001.patch, HDFS-14272.002.patch
>
>
> It is typical for integration tests to create some files and then check their existence.
For example, like the following simple bash script:
> {code:java}
> # hdfs dfs -touchz /tmp/abc
> # hdfs dfs -ls /tmp/abc
> {code}
> The test executes HDFS bash command sequentially, but it may fail with Consistent Standby
Read because the -ls does not find the file.
> Analysis: the second bash command, while launched sequentially after the first one, is
not aware of the state id returned from the first bash command. So ObserverNode wouldn't wait
for the the edits to get propagated, and thus fails.
> I've got a cluster where the Observer has tens of seconds of RPC latency, and this becomes
very annoying. (I am still trying to figure out why this Observer has such a long RPC latency.
But that's another story.)



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