Use general cluster state batching mechanism for shard failures #15016
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@bleskes I'll rebase this pull request on master when #14899 is reintegrated there. The salient commit for this review is thus ccc89c3666780d0bf7b2425f9e8c76dbe6316187 pending #14899 (all the changes for that commit are in ShardStateAction.java and some minor modifications in AllocationService.java). |
This commit modifies the handling of shard failure cluster state updates to use the general cluster state batching mechanism. An advantage of this approach is we now get correct per-listener notification on failures.
| try { | ||
| RoutingAllocation.Result result = allocationService.applyFailedShard( | ||
| currentState, | ||
| new FailedRerouteAllocation.FailedShard(task.shardRouting, task.message, task.failure)); |
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why did we loose the batch application of shard failures?
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My thinking was to get task failures only for the shards for which we were unsuccessful in marking as failed.
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we share some logic when we do it in a batch, most notably the reroute. I wonder if we should improve the reporting from the applyFailedShards so we know what happened (we'll need it)
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I wonder if we should improve the reporting from the applyFailedShards so we know what happened (we'll need it)
That's what I'm thinking now, but it should be in a separate issue on the #14252 work I think?
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I pushed 413688b to apply the failures in a single batch. For now, we will not get task-specific failures but that will come in a follow up.
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looking good. Left some comments. |
| BatchResult.Builder<ShardRoutingEntry> builder = BatchResult.builder(); | ||
| List<FailedRerouteAllocation.FailedShard> shardRoutingsToBeApplied = new ArrayList<>(tasks.size()); | ||
| for (ShardRoutingEntry task : tasks) { | ||
| task.processed = true; |
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we don't need this processed with this change..
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LGTM. Left trivial comments. |
Use general cluster state batching mechanism for shard failures
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One note - the comment from the shard started pr about error reporting holds for this one as well. Is the plan to do a followup? As with the shard started, we can just let the exception bubble up |
@bleskes Yeah. :) |
I opened #15428. |
clintongormley
added
:Distributed Indexing/Distributed
This commit modifies the handling of shard failure cluster state updates
to use the general cluster state batching mechanism. An advantage of
this approach is we now get correct per-listener notification on
failures.
Relates #14899, relates #14725