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From Boris Yen <yulin...@gmail.com>
Subject Re: Cassandra 4021
Date Mon, 11 Mar 2013 01:35:09 GMT
Hi Jonathan,

If our finding is not correct or the patch is going the wrong direction,
please kindly let us know.

Thank you in advance.

Regards,
Boris

On Sat, Mar 9, 2013 at 7:59 AM, Boris Yen <yulinyen@gmail.com> wrote:

> 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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