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https://issues.apache.org/jira/browse/CASSANDRA-13363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131999#comment-16131999
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Sam Tunnicliffe commented on CASSANDRA-13363:
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{quote} Does it take a lot of time to do "the lookup to determine which index
to use "?
1=>send the command to other replica, must after the local replica figure out
which index to use .
2=>send to all replica, all replica figure it out itself.
which looks better?
{quote}
Through profiling, we found that a non-trivial amount of time was spent in
{{SecondaryIndexManager::getBestIndexFor}}. Part of the problem was that once
found, there was no index field on the command to set, so originally this
lookup was being done 3 or 4 times per-query, on every replica.
Once that was fixed, it made sense to just do the index lookup once when the
command is constructed, so it could be included in the serialization & so save
the replicas from having to do the lookup. So the lookup goes from being
performed (4 x num_replicas) times to once per query, which seems like a good
idea generally.
> java.lang.ArrayIndexOutOfBoundsException: null
> ----------------------------------------------
>
> Key: CASSANDRA-13363
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13363
> Project: Cassandra
> Issue Type: Bug
> Environment: CentOS 6, Cassandra 3.10
> Reporter: Artem Rokhin
> Assignee: zhaoyan
> Priority: Critical
> Fix For: 3.0.x, 3.11.x, 4.x
>
>
> Constantly see this error in the log without any additional information or a
> stack trace.
> {code}
> Exception in thread Thread[MessagingService-Incoming-/10.0.1.26,5,main]
> {code}
> {code}
> java.lang.ArrayIndexOutOfBoundsException: null
> {code}
> Logger: org.apache.cassandra.service.CassandraDaemon
> Thrdead: MessagingService-Incoming-/10.0.1.12
> Method: uncaughtException
> File: CassandraDaemon.java
> Line: 229
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