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From "Doron Cohen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1044) Behavior on hard power shutdown
Date Thu, 22 Nov 2007 14:13:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544811
] 

Doron Cohen commented on LUCENE-1044:
-------------------------------------

With some artificial CPU activity added to the test program:
|| num files || num chars per file || No Sync || Sync At End || Background Sync || Immediate
Sync ||
|   100 | 10000 |  6690  |  11516 |  10706 |  11216 |
|   100 | 10000 |  7200  |  11006 |  10575 |  10846 |
|  1000 |  1000 |  8002  |  48570 |  48479 |  51825 |
|  1000 |  1000 |  7801  |  43142 |  43693 |  43342 |
| 10000 |   100 | 16303  | 152730 | 326810 | 207939 |
| 10000 |   100 | 17805  | 156375 | 160040 | 165398 |



> Behavior on hard power shutdown
> -------------------------------
>
>                 Key: LUCENE-1044
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1044
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>         Environment: Windows Server 2003, Standard Edition, Sun Hotspot Java 1.5
>            Reporter: venkat rangan
>            Assignee: Michael McCandless
>             Fix For: 2.3
>
>         Attachments: LUCENE-1044.patch, LUCENE-1044.take2.patch, LUCENE-1044.take3.patch
>
>
> When indexing a large number of documents, upon a hard power failure  (e.g. pull the
power cord), the index seems to get corrupted. We start a Java application as an Windows Service,
and feed it documents. In some cases (after an index size of 1.7GB, with 30-40 index segment
.cfs files) , the following is observed.
> The 'segments' file contains only zeros. Its size is 265 bytes - all bytes are zeros.
> The 'deleted' file also contains only zeros. Its size is 85 bytes - all bytes are zeros.
> Before corruption, the segments file and deleted file appear to be correct. After this
corruption, the index is corrupted and lost.
> This is a problem observed in Lucene 1.4.3. We are not able to upgrade our customer deployments
to 1.9 or later version, but would be happy to back-port a patch, if the patch is small enough
and if this problem is already solved.

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