[infinispan-issues] [JBoss JIRA] (ISPN-8980) High concurrency : Infinispan Directory Provider: Lucene : Error loading metadata for index file

[Debashish Bharali (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-8980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13567616#comment-13567616 ] 

Debashish Bharali commented on ISPN-8980:
-----------------------------------------

Hi [~gustavonalle],

I have multiple executions of the test case provided by you. I have attached one of the outcomes.
The tests have completed successfully. So issue is not getting replicated for the shared test case.
One point to focus on the outcome, the size of the *'.DAT'* files for the joining node 'NodeB' is way smaller than the original node 'NodeA'. (May be due to fragmentation and compaction)

I am making further changes on the test case to simulate the issue somehow.
Please share some inputs on how to proceed on this.

Additionally, I really appreciate the great support and efforts provided by you. :)
(You even created a special test case for our scenario) 

> High concurrency : Infinispan Directory Provider: Lucene : Error loading metadata for index file
> ------------------------------------------------------------------------------------------------
>
>                 Key: ISPN-8980
>                 URL: https://issues.jboss.org/browse/ISPN-8980
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Lucene Directory
>    Affects Versions: 8.2.5.Final
>            Reporter: Debashish Bharali
>            Assignee: Gustavo Fernandes
>            Priority: Critical
>         Attachments: JoiningNode_N2.zip, OriginalNode_N1.zip, SysOutLogs.txt, neutrino-hibernate-search-worker-jgroups.xml, neutrino-hibernatesearch-infinispan.xml
>
>
> During high concurrency of action, we are getting *{color:red}'Error loading metadata for index file'{color}* even in *{color:red}Non-Clustered{color}* env.
> *Hibernate Search Indexes (Lucene Indexes) - 5.7.0.Final*
> *Infinispan - 8.2.5.Final*
> *infinispan-directory-provider-8.2.5.Final*
> *jgroups-3.6.7.Final*
> *Worker Backend : JGroups*
> *Worker Execution: Sync*
> *write_metadata_async: false (implicitly)*
> *Note:* Currently we are on Non-Clustered env. We are moving to Clustered Env within few days.
> On analyzing the code, and putting some additional SYSOUT loggers into FileListOperations and DirectoryImplementor classes, we have established the following points:
> # This is happening during high concurrency on non-clustered env.
> #  One thread *'T1'* is deleting a segment and segment name *'SEG1'* from the *'FileListCacheKey'* list* stored in MetaDatacache*.
> # Concurrently, at the same time, another thread *'T2'* is looping through the FileList ['copy list' from MetadataCache - for -FileListCacheKey - provided by toArray method of *FileListOperations* (changes also being done in the corresponding original list by T1 thread) ].
> # *'T2'* is calling open input method on each segment name - getting corresponding Metadata segment from *MetadataCache*.
> # However, for *'T2'*, the *'copy list'* still contains the name of segment *'SEG1'*.
> # So while looping through the list, *'T2'* tries to get Segment from MetadataCache for segment name *'SEG1'*.
> # But at this instant, *segment* corresponding to segment name *'SEG1'*, has been already removed from *MetadataCache* by *'T1'*.
> # This results in *'java.io.FileNotFoundException: Error loading metadata for index file'* for segment name *'SEG1'*
> # As mentioned earlier, this happens more often during high concurrency.
> *{color:red}On a standalone server (non-clustered), we are getting below error intermittently:{color}*
> Full Stack trace:
> 2018-03-19 17:29:11,938  ERROR [Hibernate Search sync consumer thread for index com.nucleus.integration.ws.server.globalcustomer.entity.GlobalCustomer] o.h.s.e.i.LogErrorHandler [LogErrorHandler.java:69]
> 				*{color:red}HSEARCH000058: Exception occurred java.io.FileNotFoundException: Error loading metadata for index file{color}*: M|segments_w6|com.nucleus.integration.ws.server.globalcustomer.entity.GlobalCustomer|-1
> Primary Failure:
> 	Entity com.nucleus.integration.ws.server.globalcustomer.entity.GlobalCustomer  Id 1649990024999813056  Work Type  org.hibernate.search.backend.AddLuceneWork
> java.io.FileNotFoundException: Error loading metadata for index file: M|segments_w6|com.nucleus.integration.ws.server.globalcustomer.entity.GlobalCustomer|-1
> 	at org.infinispan.lucene.impl.DirectoryImplementor.openInput(DirectoryImplementor.java:138) ~[infinispan-lucene-directory-8.2.5.Final.jar:8.2.5.Final]
> 	at org.infinispan.lucene.impl.DirectoryLucene.openInput(DirectoryLucene.java:102) ~[infinispan-lucene-directory-8.2.5.Final.jar:8.2.5.Final]
> 	at org.apache.lucene.store.Directory.openChecksumInput(Directory.java:109) ~[lucene-core-5.5.4.jar:5.5.4 31012120ebbd93744753eb37f1dbc5e654628291 - jpountz - 2017-02-08 19:08:03]
> 	at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:294) ~[lucene-core-5.5.4.jar:5.5.4 31012120ebbd93744753eb37f1dbc5e654628291 - jpountz - 2017-02-08 19:08:03]
> 	at org.apache.lucene.index.IndexFileDeleter.<init>(IndexFileDeleter.java:171) ~[lucene-core-5.5.4.jar:5.5.4 31012120ebbd93744753eb37f1dbc5e654628291 - jpountz - 2017-02-08 19:08:03]
> 	at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:949) ~[lucene-core-5.5.4.jar:5.5.4 31012120ebbd93744753eb37f1dbc5e654628291 - jpountz - 2017-02-08 19:08:03]
> 	at org.hibernate.search.backend.impl.lucene.IndexWriterHolder.createNewIndexWriter(IndexWriterHolder.java:126) ~[hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.IndexWriterHolder.getIndexWriter(IndexWriterHolder.java:92) ~[hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.AbstractCommitPolicy.getIndexWriter(AbstractCommitPolicy.java:33) ~[hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.SharedIndexCommitPolicy.getIndexWriter(SharedIndexCommitPolicy.java:77) ~[hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.SharedIndexWorkspaceImpl.getIndexWriter(SharedIndexWorkspaceImpl.java:36) ~[hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.AbstractWorkspaceImpl.getIndexWriterDelegate(AbstractWorkspaceImpl.java:203) [hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.LuceneBackendQueueTask.applyUpdates(LuceneBackendQueueTask.java:81) [hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.LuceneBackendQueueTask.run(LuceneBackendQueueTask.java:46) [hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.SyncWorkProcessor$Consumer.applyChangesets(SyncWorkProcessor.java:165) [hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at org.hibernate.search.backend.impl.lucene.SyncWorkProcessor$Consumer.run(SyncWorkProcessor.java:151) [hibernate-search-engine-5.7.0.Final.jar:5.7.0.Final]
> 	at java.lang.Thread.run(Thread.java:785) [na:1.8.0-internal]
> *As per our understanding, this issue should not come in {color:red}'non-clustered'{color} env. Also it should not arise when worker execution is {color:red}'sync'{color}.*
> *We have debugged the code, and confirmed that the value for {color:red}'write_metadata_async'{color} is coming as 'false' only (as expected).*



--
This message was sent by Atlassian JIRA
(v7.5.0#75005)