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https://issues.apache.org/jira/browse/HDFS-13119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364058#comment-16364058
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Yiqun Lin edited comment on HDFS-13119 at 2/14/18 1:51 PM:
-----------------------------------------------------------
Thanks for the review, [~elgoiri].
{quote}Otherwise, we could just do:
{noformat}
if (isClusterUnAvailable(nsId) && retryCount > 0) {
throw new IOException("No namenode available under nameservice " + nsId, ioe);
}
{noformat}
Then, the default logic takes care of the first retry.
{quote}
Actually the default logic won't takes care of the first retry. Here we use the
retry policy {{FailoverOnNetworkExceptionRetry}}, it will firstly jump into
logic of {{RetryDecision.FAILOVER_AND_RETRY}} and throw {{StandbyException}}.
In the failover rerty, the retry count is passing as 0 again.
Attach the new patch to fix some warnings.
was (Author: linyiqun):
Thanks for the review, [~elgoiri].
{quote}Otherwise, we could just do:
{noformat}
if (isClusterUnAvailable(nsId) && retryCount > 0) {
throw new IOException("No namenode available under nameservice " + nsId, ioe);
}
{noformat}
Then, the default logic takes care of the first retry.
{quote}
Actually the default logic won't takes care of the first retry. Here we use the
retry policy {{FailoverOnNetworkExceptionRetry}}, it will firstly jump into
logic of {{RetryDecision.FAILOVER_AND_RETRY}} and throw {{StandbyException}}.
In the failover rerty, the retry count is passing as 0 again.
> RBF: Manage unavailable clusters
> --------------------------------
>
> Key: HDFS-13119
> URL: https://issues.apache.org/jira/browse/HDFS-13119
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Íñigo Goiri
> Assignee: Yiqun Lin
> Priority: Major
> Attachments: HDFS-13119.001.patch, HDFS-13119.002.patch,
> HDFS-13119.003.patch
>
>
> When a federated cluster has one of the subcluster down, operations that run
> in every subcluster ({{RouterRpcClient#invokeAll()}}) may take all the RPC
> connections.
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