Heavy Disk I/O when merging.
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Key: LUCENENET-108
URL: https://issues.apache.org/jira/browse/LUCENENET-108
Project: Lucene.Net
Issue Type: Improvement
Environment: Lucene.Net 2.0.0.4
Windows 2003 Intel Dual Core 2Ghz, 2gb RAM, SATA 7200 rpm,
Framework 2.0
Reporter: Thomas Guttesen
Hi.
I am experiencing issues with Lucene when using IndexWriter.AddIndexes() in
FSWriter.
I am writing to a subindex that is not searchable from my application. I can
write fast and non-optimized in this. In certain intervals i close the subindex
for writing and add it to the main index and hereby optimized. The main index
is searchable. I am running the process with low priority.
The problem is that disk I/O can be very heavy while merging. So heavy that
response in UI on the server get slower the larger the index get. Other
processes with higher prority gets slow and sometimes nonresponsive while
merging is ongoing.
Checking the CPU load there is hardly none, so it must be a disk I/O issue. I
have seen the same problem on quad CPU systems with RAID5, 10000rpm etc
(Windows 2003). Not as baddd, but it indicates for me that there is a general
issue.
Is there any chance that this process can be lifted, so it does not cause this
to happen.
Regards
Thomas Guttesen
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