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From Boris Yen <yulin...@gmail.com>
Subject Re: Cassandra 4021
Date Fri, 08 Mar 2013 23:59:42 GMT
Use the following sstable on our file system as an example.

rw-rr- 1 byan admin 333 Mar 5 15:26 indexBytes-hd-115-Index.db
rw-rr- 1 byan admin 66305 Mar 5 15:26 indexBytes-tmp-hd-115-Data.db
rw-rr- 1 byan admin 67 Mar 5 15:26 indexBytes-tmp-hd-115-Digest.sha1
rw-rr- 1 byan admin 1936 Mar 5 15:26 indexBytes-tmp-hd-115-Filter.db

The reason why we tweak the hashcode and equals methods is that the
Descriptor for indexBytes-hd-115-Index.db and  indexBytes-tmp-hd-115-Data.db
are the same. If the Descriptor is used as key in a map and
indexBytes-hd-115-Index.db
get listed first, the C* will consider that the there are four components
for this Descriptor [Digest.sha1, Index.db, Filter.db, Data.db]. In this
case, it is not correct. When removing orphans for sstable, the Descriptor
will be used to create the filename to delete files, that is why C* cannot
find the file to delete.

Regards,
Boris

On Sat, Mar 9, 2013 at 12:54 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> Thanks, Boris. Can you explain what the cause is, and why tweaking hashCode
> fixes it?
> On Mar 8, 2013 4:17 AM, "Boris Yen" <yulinyen@gmail.com> wrote:
>
> > Hi,
> >
> > We have run into this a few times on 1.0.10. It seems this happens when
> > the file-rename after compaction is not completed. We have created a
> patch
> > for this. However, in order to make sure we do not break anything, I was
> > wondering if anyone could help us review the changes to see if this would
> > cause any issue or not.
> >
> > Thanks and Regards,
> > Boris
> >
>

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