Primary mds failure

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Hi
   We are observing that when the primary mds goes away(say OOM killer
victim), the client keeps on trying (forever) to write to it(try_write
method in the messenger) and eventually results in filesystem hang. So
the question is :

 - Why does the kernel client attempt another mds?
 - Is replication (mds) guaranteed to take place before the primary
mds goes down? In other words, is replication done preemtively or due
to a trigger (scheduled or event based)?

thanks again
Jojy
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