FAQ
Hi Everyone,

We have an application built using Lucene 1.9. The app allows incremental updating to the index while other users are searching the same index. Today, some search suddenly returns nothing when we know it should return some hits. This does not happen all the time. Sometimes the search succeeded. When checking the logs, I found the following error during searching:

Parameter[0]: java.io.IOException: Resource temporarily unavailable


When this error occurred, there were 2 other users deleting documents from the same index. The deletions seemed to succeed, but the search failed.

I have no clue what could have caused such error. Unfortunately there is no further info in the logs. Can someone please shed some light on this? Thanks.


Alex

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  • Grant Ingersoll at Aug 6, 2008 at 6:42 pm
    What's the full exception? We don't even know that the exception is
    in Lucene from what you've described. So, w/o more info, it will be
    pretty hard to help, but if I had to guess, it sounds like you've got
    some threading problems, but who knows.

    Also, no need to send the exact same email 5 minutes apart.
    On Aug 6, 2008, at 2:19 PM, Alex Wang wrote:


    Hi Everyone,

    We have an application built using Lucene 1.9. The app allows
    incremental updating to the index while other users are searching
    the same index. Today, some search suddenly returns nothing when we
    know it should return some hits. This does not happen all the time.
    Sometimes the search succeeded. When checking the logs, I found the
    following error during searching:

    Parameter[0]: java.io.IOException: Resource temporarily unavailable


    When this error occurred, there were 2 other users deleting
    documents from the same index. The deletions seemed to succeed, but
    the search failed.

    I have no clue what could have caused such error. Unfortunately
    there is no further info in the logs. Can someone please shed some
    light on this? Thanks.


    Alex


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  • Alex Wang at Aug 6, 2008 at 7:07 pm
    Sorry about the double posting. After sending the first email I got a delivery failure notice from support@magentanews.com. I resent it just to be sure.

    Unfornately there is no stack trace in the log. The error object was passed to log4j.error(...), but no stack trace was printed out.

    I thought both IndexReader and IndexWriter are thread safe. Beside, I have no explicit multi-threading in our own code.

    Thanks again!

    ****************************************************
    Alex Wang
    CrossView Inc.
    Office: 416-281-6888
    Email: awang@crossview.com
    Web: http://www.crossview.com
    ****************************************************


    This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation.

    -----Original Message-----
    From: Grant Ingersoll
    Sent: Wednesday, August 06, 2008 2:42 PM
    To: java-user@lucene.apache.org
    Subject: Re: Urgent Help Please: "Resource temporarily unavailable"

    What's the full exception? We don't even know that the exception is
    in Lucene from what you've described. So, w/o more info, it will be
    pretty hard to help, but if I had to guess, it sounds like you've got
    some threading problems, but who knows.

    Also, no need to send the exact same email 5 minutes apart.
    On Aug 6, 2008, at 2:19 PM, Alex Wang wrote:


    Hi Everyone,

    We have an application built using Lucene 1.9. The app allows
    incremental updating to the index while other users are searching
    the same index. Today, some search suddenly returns nothing when we
    know it should return some hits. This does not happen all the time.
    Sometimes the search succeeded. When checking the logs, I found the
    following error during searching:

    Parameter[0]: java.io.IOException: Resource temporarily unavailable


    When this error occurred, there were 2 other users deleting
    documents from the same index. The deletions seemed to succeed, but
    the search failed.

    I have no clue what could have caused such error. Unfortunately
    there is no further info in the logs. Can someone please shed some
    light on this? Thanks.


    Alex


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  • Grant Ingersoll at Aug 6, 2008 at 7:43 pm

    On Aug 6, 2008, at 3:06 PM, Alex Wang wrote:

    Sorry about the double posting. After sending the first email I got
    a delivery failure notice from support@magentanews.com. I resent it
    just to be sure.

    Unfornately there is no stack trace in the log. The error object was
    passed to log4j.error(...), but no stack trace was printed out.

    I thought both IndexReader and IndexWriter are thread safe. Beside,
    I have no explicit multi-threading in our own code.
    They are thread-safe. Not really sure what else to go on. Sorry.

    -Grant

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postedAug 6, '08 at 6:20p
activeAug 6, '08 at 7:43p
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