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https://issues.apache.org/jira/browse/HDFS-14134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16739719#comment-16739719
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Lukas Majercak commented on HDFS-14134:
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Added patch006 together with HDFS-14134_retrypolicy_change_proposal_1.pdf to
explain the changes. After the discussion, it seems like just changing the
logic for remote IOExceptions together with the priority for retry actions will
be enough. Could you review this [~knanasi] ? Thanks!
> Idempotent operations throwing RemoteException should not be retried by the
> client
> ----------------------------------------------------------------------------------
>
> Key: HDFS-14134
> URL: https://issues.apache.org/jira/browse/HDFS-14134
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs, hdfs-client, ipc
> Reporter: Lukas Majercak
> Assignee: Lukas Majercak
> Priority: Critical
> Attachments: HDFS-14134.001.patch, HDFS-14134.002.patch,
> HDFS-14134.003.patch, HDFS-14134.004.patch, HDFS-14134.005.patch,
> HDFS-14134.006.patch, HDFS-14134_retrypolicy_change_proposal.pdf,
> HDFS-14134_retrypolicy_change_proposal_1.pdf
>
>
> Currently, some operations that throw IOException on the NameNode are
> evaluated by RetryPolicy as FAILOVER_AND_RETRY, but they should just fail
> fast.
> For example, when calling getXAttr("user.some_attr", file") where the file
> does not have the attribute, NN throws an IOException with message "could not
> find attr". The current client retry policy determines the action for that to
> be FAILOVER_AND_RETRY. The client then fails over and retries until it
> reaches the maximum number of retries. Supposedly, the client should be able
> to tell that this exception is normal and fail fast.
> Moreover, even if the action was FAIL, the RetryInvocationHandler looks at
> all the retry actions from all requests, and FAILOVER_AND_RETRY takes
> precedence over FAIL action.
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