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Add NodeVersionAllocationDecider that prevent allocations that require forward compatibility. #4602

Merged
merged 2 commits into from
Jan 3, 2014
Merged

Add NodeVersionAllocationDecider that prevent allocations that require forward compatibility. #4602

merged 2 commits into from
Jan 3, 2014

Commits on Jan 3, 2014

  1. Add NodeVersionAllocationDecider that prevent allocations that requir… 

    …e forward compatibility.

Today during restart scenarios it is possible that we recover from a node that
has already been upgraded to version N+1. The node that we relocate to is
on version N and might not be able to read the index format from the node
we relocate from. This causes `IndexFormatToNewException` during
recovery but only after recovery has finished which can cause large
load spikes during the upgrade period.

Closes elastic#4588
    @s1monw
    s1monw committed Jan 3, 2014
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  2. Pass correct number of expected shards to assertion

    @s1monw
    s1monw committed Jan 3, 2014
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