[#CMP-300] Concurrent modification and querying of one object can cause it to appear twice in CompassHits

Compass

Concurrent modification and querying of one object can cause it to appear twice in CompassHits

Created: 23/Oct/06 03:17 PM Updated: 25/Oct/06 05:35 AM

Component/s:

Compass::Core

Affects Version/s:

1.0.0, 1.0.1, 1.1 M1, 1.1 M2

Fix Version/s:

1.1 M3

File Attachments:

CompassTest.java (4 kB)
2.

Tobesearched.cpm.xml (0.6 kB)
3.

ToBeSearched.java (0.7 kB)

Description

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If you query and mutate an object in two different threads then sometimes you will get the same object twice in the CompassHits ,it is the same object instance. This happens with a transaction isolation level of ReadCommitted.

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Chris Cottee added a comment - 23/Oct/06 03:20 PM

I have attached a junit test which demonstrates getting the same object twice.

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Shay Banon added a comment - 23/Oct/06 03:33 PM

The bug happens because of the order of flushing deletes and writing the segment file. Another note, in CompassTest, the search should use findWithDetach and not just find.

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Shay Banon added a comment - 23/Oct/06 04:29 PM

Ok, I have fixed it both in 1.1 M3, and 1.0 branch. Have ran the tests (actually added a variation to Compass unit tests) and they pass. Can you give 1.1 M3 SNAPSHOT a go, and verify that it is fixed as well?

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Chris Cottee added a comment - 25/Oct/06 04:31 AM

Hi,
we tested the 1.1 M3 SNAPSHOT as of 24th Oct and it is fixed. Thanks !
Chris