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https://issues.apache.org/jira/browse/HDFS-13835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16713515#comment-16713515
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Ayush Saxena commented on HDFS-13835:
-------------------------------------
Thanx [~ramkumar] and [~elgoiri] for the discussion.
I guess
bq. ./hdfs dfsrouteradmin -update /apps ns1,ns2 /tmp1,/tmp2 -order RANDOM (And
if i try to add any files to the mount entry /apps its giving errors)
This statement seems to be the culprit to me.
Firstly before update the scenerio was somewhat like:
/apps pointed to ns1-->/tmp1 and ns2-->/tmp2 (for which the actual
destinations exists)
After the update
/apps pointed to ns1-->/tmp1,/tmp2 and ns2-->/tmp1,/tmp2 (these destination
doesn't exist)
The intention was to keep the dest pointing as before only but if we see in the
update command::
While parsing the arguments we split the namespace only with COMMA not the
destinations.
{code:java}
String mount = parameters[i++];
String[] nss = parameters[i++].split(",");
String dest = parameters[i++];
{code}
And we consider the destination as one.while putting it in the destMap.The
following logic in the code might give more clarity.
{code:java}
Map<String, String> destMap = new LinkedHashMap<>();
for (String ns : nss) {
destMap.put(ns, dest);
}
{code}
The command is made in way such that if you give ns1,ns2 and dest as /tmp it
will mount ns1-->/tmp and ns2-->/tmp.This seems quite obvious too if we provide
more number of destinations than the namespace.how we will actually decide
which one destinations goes to one NS.
So I guess ORDER change has nothing as such related which could stop creating a
file if the destination exist.It deals just with the logic where to direct the
request.Here the error message received also gives the HINT
bq. No such file or directory:
Pls correct if I misunderstood something in the context :)
> RBF: Unable to add files after changing the order
> -------------------------------------------------
>
> Key: HDFS-13835
> URL: https://issues.apache.org/jira/browse/HDFS-13835
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: venkata ram kumar ch
> Assignee: venkata ram kumar ch
> Priority: Critical
>
> When a mount point it pointing to multiple sub cluster by default the order
> is HASH.
> But After changing the order from HASH to RANDOM i am unable to add files to
> that mount point.
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