Do not skip not available shard exception in search response #64337
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Today search responses do not report failures for shard that were not available
for the search.
So if one shard is not assigned on a search over 5 shards, the
search response will report:
```
"_shards": {
"total": 5,
"successful": 4,
"skipped": 0,
"failed": 0
}
```
If all shards are unassigned, we report a generic search phase exception with no cause.
It's easy to spot that `successful` is less than `total` in the response but not reporting
the failure is misleading for users.
This change removes the special handling of not available shards exception in search responses
and treat them as any other failure that could occur on a shard.
These exceptions will count in the `failed` section and will be reported in details in
the `shard_failures` section.
If all shards are unavailable, the search API will now return 404 NOT_FOUND as an indication
that the search failed because it couldn't find any of the resources.
Closes elastic#47700
jimczi
added
>enhancement
:Search/Search
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Pinging @elastic/es-search (:Search/Search) |
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Pinging @elastic/es-distributed (:Distributed/Distributed) |
elasticmachine
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Team:Distributed (Obsolete)
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henningandersen
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Thanks @jimczi for addressing this. Besides the comments below, I wonder if we should also add relevant shard-failures to the allowPartialSearchResults=false case in AbstractSearchAsyncAction.run?
I think we can also remove the discrepancy check in executeNextPhase?
server/src/main/java/org/elasticsearch/action/search/AbstractSearchAsyncAction.java
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server/src/internalClusterTest/java/org/elasticsearch/search/basic/SearchRedStateIndexIT.java
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One more minor nit is the comment here. |
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One more comment.
server/src/main/java/org/elasticsearch/action/search/SearchResponse.java
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jimczi
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Nov 24, 2020
Today search responses do not report failures for shard that were not available
for the search.
So if one shard is not assigned on a search over 5 shards, the
search response will report:
```
"_shards": {
"total": 5,
"successful": 4,
"skipped": 0,
"failed": 0
}
```
If all shards are unassigned, we report a generic search phase exception with no cause.
It's easy to spot that `successful` is less than `total` in the response but not reporting
the failure is misleading for users.
This change removes the special handling of not available shards exception in search responses
and treat them as any other failure that could occur on a shard.
These exceptions will count in the `failed` section and will be reported in details in
the `shard_failures` section.
If all shards are unavailable, the search API will now return 404 NOT_FOUND as an indication
that the search failed because it couldn't find any of the resources.
Closes #47700
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Today search responses do not report failures for shard that were not available
for the search.
So if one shard is not assigned on a search over 5 shards, the
search response will report:
If all shards are unassigned, we report a generic search phase exception with no cause.
It's easy to spot that
successfulis less thantotalin the response but not reportingthe failure is misleading for users.
This change removes the special handling of not available shards exception in search responses
and treat them as any other failure that could occur on a shard.
These exceptions will count in the
failedsection and will be reported in details inthe
shard_failuressection.Closes #47700