[jira] Commented: (LUCENE-2815) MultiFields not thread safe

["Yonik Seeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971909#action_12971909 ] 

Yonik Seeley commented on LUCENE-2815:
--------------------------------------

So I started looking into MultiFields more closely, just from a performance perspective, and noticed a couple of thread safety issues:
- MultiFields is reused (a good thing), but isn't safely published to other threads.
- MultiFields has a HashMap that is used and modified unsynchronized to cache MultiTerms instances

> MultiFields not thread safe
> ---------------------------
>
>                 Key: LUCENE-2815
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2815
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Yonik Seeley
>
> MultiFields looks like it has thread safety issues

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