Add NodeVersionAllocationDecider that prevent allocations that require forward compatibility. #4602
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+1, looks good! |
…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
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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
IndexFormatToNewExceptionduringrecovery but only after recovery has finished which can cause large
load spikes during the upgrade period.
Closes #4588