Assertion trips in SearchHits$Total#writeTo in CI #36284
Description
A CI failure https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+intake/542/console has exposed the tripping of a new assertion when running in a mixed cluster. The assertion that trips is:
When this assertion is hit, node-2 terminates in the test which results in the search failure due to the node being disconnected.
[2018-12-05T20:44:21,496][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-2] fatal error in thread [elasticsearch[node-2][search][T#21]], exiting
java.lang.AssertionError: null
at org.elasticsearch.search.SearchHits$Total.writeTo(SearchHits.java:313) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.search.SearchHits.writeTo(SearchHits.java:213) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.search.fetch.FetchSearchResult.writeTo(FetchSearchResult.java:102) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.search.fetch.QueryFetchSearchResult.writeTo(QueryFetchSearchResult.java:101) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.transport.TcpTransport.buildMessage(TcpTransport.java:946) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.transport.TcpTransport.sendResponse(TcpTransport.java:899) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.transport.TcpTransport.sendResponse(TcpTransport.java:872) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.transport.TcpTransportChannel.sendResponse(TcpTransportChannel.java:70) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.transport.TaskTransportChannel.sendResponse(TaskTransportChannel.java:54) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.action.support.HandledTransportAction$ChannelActionListener.onResponse(HandledTransportAction.java:93) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.action.support.HandledTransportAction$ChannelActionListener.onResponse(HandledTransportAction.java:77) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.search.SearchService$2.onResponse(SearchService.java:357) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.search.SearchService$2.onResponse(SearchService.java:353) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.search.SearchService$4.doRun(SearchService.java:1094) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:759) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:41) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.0.0-SNAPSHOT.jar:7.0.0-SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
I have not been able to reproduce this, but the reproduce line is:
./gradlew :qa:mixed-cluster:v6.6.0#mixedClusterTestRunner \
-Dtests.seed=D53E935D92AC375C \
-Dtests.class=org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT \
-Dtests.method="test {p0=indices.sort/10_basic/Index Sort}" \
-Dtests.security.manager=true \
-Dtests.locale=cs-CZ \
-Dtests.timezone=America/Santiago \
-Dcompiler.java=11 \
-Druntime.java=8
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