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https://issues.apache.org/jira/browse/SOLR-4916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705634#comment-13705634
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Uwe Schindler edited comment on SOLR-4916 at 7/11/13 9:25 AM:
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Hi Mark,
while reviewing the current committed stuff I found a "bug":
HdfsDirectory has a special case to prevent the {{segments.gen}} file from
being written: It redirecty the output to an NullIndexOutput. The bug is that
HdfDirectory has a static instance of this NullIndexOutput, but the static
instance has "state" (file-size, file position). When you return always the
same instance this is keeping state and not safe if used by different threads
in parallel - so it could cause bugs. openOutput must return a new instance
(which costs nothing as its a small object on Eden Heap only).
See attached patch!
was (Author: thetaphi):
Hi Mark,
while reviewing the current committed stuff I found a "bug":
HdfsDirectory has a special case to prevent the {{segments.gen}} file from
being written: It redirecty the output to an NullIndexOutput. The bug is that
HdfDirectory has a static instance of this NullIndexOutput, but the static
instance has "state" (file-size, file position). When you return always the
same instance this is keeping state and not safe if used by different threads
in parallel - so it could cause bugs. openOutput must return a new instance
(which costs nothing as its a small object on Eden Heap only).
> Add support to write and read Solr index files and transaction log files to
> and from HDFS.
> ------------------------------------------------------------------------------------------
>
> Key: SOLR-4916
> URL: https://issues.apache.org/jira/browse/SOLR-4916
> Project: Solr
> Issue Type: New Feature
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 5.0, 4.4
>
> Attachments: SOLR-4916-ivy.patch,
> SOLR-4916-move-MiniDfsCluster-deps-from-solr-test-framework-to-solr-core.patch,
> SOLR-4916-nulloutput.patch, SOLR-4916.patch, SOLR-4916.patch, SOLR-4916.patch
>
>
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