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Posted to dev@lucene.apache.org by "Michael Braun (JIRA)" <ji...@apache.org> on 2017/04/04 21:31:41 UTC
[jira] [Commented] (SOLR-10375) Stored text > 716MB retrieval with
StoredFieldVisitor causes out of memory error with document cache
[ https://issues.apache.org/jira/browse/SOLR-10375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955878#comment-15955878 ]
Michael Braun commented on SOLR-10375:
--------------------------------------
[~arafalov] Yes this would have been solved by using large fields.
[~dsmiley] My question now becomes at what size/length should Solr be expected to support for stored string values? I'd imagine making that call instead does come at some cost overall.
> Stored text > 716MB retrieval with StoredFieldVisitor causes out of memory error with document cache
> ----------------------------------------------------------------------------------------------------
>
> Key: SOLR-10375
> URL: https://issues.apache.org/jira/browse/SOLR-10375
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 6.2.1
> Environment: Java 1.8.121, Linux x64
> Reporter: Michael Braun
>
> Using SolrIndexSearcher.doc(int n, StoredFieldVisitor visitor) -
> If the document cache has the document, will call visitFromCached, will get an out of memory error because of line 752 of SolrIndexSearcher - visitor.stringField(info, f.stringValue().getBytes(StandardCharsets.UTF_8));
> {code}
> at java.lang.OutOfMemoryError.<init>()V (OutOfMemoryError.java:48)
> at java.lang.StringCoding.encode(Ljava/nio/charset/Charset;[CII)[B (StringCoding.java:350)
> at java.lang.String.getBytes(Ljava/nio/charset/Charset;)[B (String.java:941)
> at org.apache.solr.search.SolrIndexSearcher.visitFromCached(Lorg/apache/lucene/document/Document;Lorg/apache/lucene/index/StoredFieldVisitor;)V (SolrIndexSearcher.java:685)
> at org.apache.solr.search.SolrIndexSearcher.doc(ILorg/apache/lucene/index/StoredFieldVisitor;)V (SolrIndexSearcher.java:652)
> {code}
> This is due to the current String.getBytes(Charset) implementation, which allocates the underlying byte array as a function of charArrayLength*maxBytesPerCharacter, which for UTF-8 is 3. 3 * 716MB is over Integer.MAX, and the JVM cannot allocate over this, so an out of memory exception is thrown because the allocation of this much memory for a single array is currently impossible.
> The problem is not present when the document cache is disabled.
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