Hoping someone can shed some light on the differences in the index deletion policies that are standard with compass. We've recently switched to an NFS based index share with 1 central server writing and numerous servers reading. Once we switched to NFS we started to periodically see the notorious NFS Stale File Handle errors creeping up in the client log files. Based on suggestions from this forum and other research we decided to try to change the indexDeletionPolicy to something else. We are using the expireTime policy.
Previously when using the default "keepLastCommit" policy there were 3 files created on our file system after a full reindex of the database shown below:
storm> ls -l index/media
-rw-r--r-- 1 user user 41 2008-09-10 16:00 segments_1z
-rw-r--r-- 1 user user 20 2008-09-10 16:00 segments.gen
-rw-r--r-- 1 user user 451804 2008-09-10 16:00 _y.cfs
After changing the indexDeletionPolicy to use expirationTime it appears as if the search engine doesn't use the compound file format. Below is the configuration change as well as the listing that shows up after a re-index
<analyzer name="default" type="Standard" />
<optimizer schedule="true" scheduleInterval="30"
storm> ls index/media
_a.cfs segments_1v segments_1x segments_1z _w.cfs _x.fdt _x.fnm _x.nrm _x.tii _y.cfs _y.fdx _y.frq _y.prx _y.tis
_l.cfs segments_1w segments_1y segments.gen _x.cfs _x.fdx _x.frq _x.prx _x.tis _y.fdt _y.fnm _y.nrm _y.tii
My expectation was that there would be more *.cfs files and some .del files but not all of the field name (.fnm) and term frequency (*.frq) files. It seems like changing the indexDeletionPolicy doesn't regard the compoundFileFormat. We are using compass 1.2.2 with Lucene 2.2.0.
Can any one explain what we should expect by changing the policy.
After digging through this a bit more it appears as if the index does get compressed after forcing the optimizer to run. What I'm still confused about is why the optimizer (adaptive) shows needsOptimization = false even there there are 70+ segments_N files in the index directory. Break pointing the code shows segmentInfos.size() = 1 and since that's less than the mergeFactor of 10 the optimizer isn't running. Why wouldn't the segmentInfos.size() show 70?
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