Hi Uwe,
Thanks for the clarification.
We may have to rewrite the whole logic related to it, as seek functionality is
no more for IndexOutput.
BTW, I have one more query related to it.
On playing around, I see, directory.createOutput(String name, IOContext
context) API throwing FileAlreadyExistsException in case the file[say
output.index] already exists in 8.11.2.
Now, I wondering, if my process is closed. And the in new process I want to use
the same file[output.index] to keep appending to write. How, I can achieve it?
My Sample code:
========================================
Try {
SimpleFSDirectory directory = new SimpleFSDirectory(new
File("E:\\Lucene-index").toPath());
IndexOutput output = directory.createOutput("output.index",
IOContext.DEFAULT);
output.writeInt(223344);
output.writeString("Testing Testing");
output.close();
} catch(Exception e) {
e.printStackTrace();
}
==============================================
Regards
Rajib
-----Original Message-----
From: Uwe Schindler <u...@thetaphi.de>
Sent: 06 February 2023 16:46
To: java-user@lucene.apache.org
Subject: Re: Need help for conversion code from Lucene 2.4.0 to 8.11.2
Hi,
Since around Lucene 4 (maybe already in 3) there is no way to write
index files in random access anymore. All data must be written in
sequence (aka input stream). This is especially important as Lucene
index files use checksums since around Lucene 5.
Uwe
Am 06.02.2023 um 11:57 schrieb Saha, Rajib:
> Hi Mikhail,
>
> Thanks for all youโre your suggestions in one shot.
> It helped us a lot.
> Thank you very much once again. ๐
>
> Need one more suggestion for below API.
> ==========================
> IndexOutput.seek(long pos)
> ==========================
>
> We have used it extensively in around 40-50 places.
> Currently, this API is not there.
>
> Could you please suggest, how we can handle the API in 8.11.2?
>
> Regards
> Rajib
>
>
> -----Original Message-----
> From: Mikhail Khludnev <m...@apache.org>
> Sent: 01 February 2023 12:22
> To: java-user@lucene.apache.org
> Subject: Re: Need help for conversion code from Lucene 2.4.0 to 8.11.2
>
> Hello, Rajib.
>
> On Mon, Jan 30, 2023 at 4:07 PM Saha, Rajib <rajib.s...@sap.com.invalid>
> wrote:
>
>> Hi Mikhail,
>>
>> Thanks for your suggestion. It solved lots of cases today in my end. ๐
>>
>> I need some more suggestions from your end. I am putting together as below
>> one by one:
>> ================================
>> In 2.4, we have used couple of cases with APIs:
>>
>> Field(String name, String value, Field.Store store, Field.Index index)
>> Field(String name, String value, Field.Store store, Field.Index index,
>> Field.TermVector termVector)
>>
> Check org.apache.lucene.document.StringField/TextField and its FieldType
> constants.
>
>
>> In 8.11, I can see suitable API corresponding to it as :
>> Field(String name, Reader reader, IndexableFieldType type)
>>
>> But, I am not clear, how can I use IndexableFieldType for Field.Store,
>> Field.Index, Field.TermVector.
>> Can you please suggest here?
>>
> check usages for org.apache.lucene.document.Field.Store
> org.apache.lucene.document.FieldType#setIndexOptions
> org.apache.lucene.document.FieldType#setStoreTermVectors
>
>
>
>> =================================
>>
>> In 2.4, there was an API:
>> IndexReader.indexExists(File file)
>> This checks, if index files exists in the path.
>>
>> In 8.11, any API, which can do the same job?
>>
> org.apache.lucene.index.DirectoryReader#indexExists
>
>
>> ==================================
>> In 2.4, there was an API:
>> IndexReader.isLocked(FSDirectory fsdir)
>> IndexReader.unlock(Directory directory)
>>
>> In 8.11, are IndexReader and IndexWritter synchronized enough internally
>> for not using the APIs?
>>
> org.apache.lucene.store.BaseDirectory#obtainLock
> Lock.close()
>
> IndexWriters are mutually exclusive via lock factory.
> org.apache.lucene.index.DirectoryReader#open(org.apache.lucene.index.IndexWriter)
> opens NRT reader i.e. search what not yet committed.
>
>
>> Or is there any other class contain the suitable similar APIs?
>>
>> ==================================
>> If I have to delete a document from Index file with Doc Id, which API to
>> use?
>>
>> Previously there was an API
>> IndexReader.deleteDocument(docID)
>>
> org.apache.lucene.index.IndexWriter#deleteDocuments(org.apache.lucene.index.Term...)
>
>
>> ==================================
>> IndexWritter. addIndexesNoOptimize(FSDirectory[])
>> IndexWriter.optimize()
>>
>> Is there any similar concept in 8.11? If so, can you please help with APIs
>>
> org.apache.lucene.index.IndexWriter#addIndexes(org.apache.lucene.store.Directory...)
> But it kicks merge underneath. Should be fine.
>
> ===================================
>> Regards
>> Rajib
>>
>>
>>
>>
>> -----Original Message-----
>> From: Mikhail Khludnev <m...@apache.org>
>> Sent: 29 January 2023 18:05
>> To: java-user@lucene.apache.org
>> Subject: Re: Need help for conversion code from Lucene 2.4.0 to 8.11.2
>>
>> Hello,
>> You can use
>> // gather list of valid fields from lucene
>> Collection<String> fields = FieldInfos.getIndexedFields(ir);
>> to loop field names.
>> And then obtain terms per field vis
>>
>> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flucene.apache.org%2Fcore%2F8_11_2%2Fcore%2Forg%2Fapache%2Flucene%2Findex%2FMultiTerms.html%23getTerms-org.apache.lucene.index.IndexReader-java.lang.String-&data=05%7C01%7Crajib.saha%40sap.com%7C0bf8263294c94ff6180108db08338af0%7C42f7676cf455423c82f6dc2d99791af7%7C0%7C0%7C638112789690761979%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=M5ixyr%2BiAcNqDZ4ggbmG6tKqnsHsqmmacU5wP7iEvlE%3D&reserved=0
>>
>> On Sun, Jan 29, 2023 at 2:08 PM Saha, Rajib <rajib.s...@sap.com.invalid>
>> wrote:
>>
>>> Hi Mikhail,
>>>
>>> Thanks for the reference link.
>>> It really helped me.
>>>
>>> In One of my requirement, I need to extract, all the Terms in a
>>> IndexReader.
>>> I was trying the reference code " Fields fields = reader.fields();" in
>>> your reference link.
>>>
>>> But, there is no "reader.fields()" in 8.11.2.
>>>
>>> Could you please suggest someway to extract all the Terms with an
>>> IndexReader or some alternative ways?
>>>
>>> Regards
>>> Rajib
>>>
>>> -----Original Message-----
>>> From: Mikhail Khludnev <m...@apache.org>
>>> Sent: 19 January 2023 04:26
>>> To: java-user@lucene.apache.org
>>> Subject: Re: Need help for conversion code from Lucene 2.4.0 to 8.11.2
>>>
>>> [You don't often get email from m...@apache.org. Learn why this is
>>> important at https://aka.ms/LearnAboutSenderIdentification ]
>>>
>>> Hello, Rajib.
>>> API were evolved since 2.4, but it should be clear
>>>
>>>
>> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flucene.apache.org%2Fcore%2F8_11_2%2Fcore%2Forg%2Fapache%2Flucene%2Findex%2Fpackage-summary.html%23fields&data=05%7C01%7Crajib.saha%40sap.com%7C0bf8263294c94ff6180108db08338af0%7C42f7676cf455423c82f6dc2d99791af7%7C0%7C0%7C638112789690761979%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=HMCAtPvnCu4ApbDxt%2BegbcFXKWfJYNz8xOMuRCDEgNc%3D&reserved=0
>>>
>>> On Wed, Jan 18, 2023 at 1:11 PM Saha, Rajib <rajib.s...@sap.com.invalid>
>>> wrote:
>>>
>>>> Hi All,
>>>>
>>>> We are in a process for conversion of Lucene from 2.4.0 to 8.11.2 for
>>> our
>>>> platform code.
>>>> We have used extensively Lucene in our code.
>>>>
>>>> We have replaced several of our code to Lucene 8.11.2 APIs.
>>>>
>>>> But, few places, we are stuck of which New Lucene APIs to use, as not
>>>> getting any suitable match.
>>>>
>>>> Can somebody help me, how we can convert below code using Lucene 2.4.0
>> to
>>>> 8.11.2?
>>>>
>>>>
>>>> ProcessDocs(IndexReader reader, Term t) {
>>>>
>>>> final TermDocs termDocs = reader.termDocs();
>>>> termDocs.seek(t);
>>>> while (termDocs.next()) {
>>>> //Some internal function to process the doc.
>>>> forEach.process(termDocs.doc());
>>>> }
>>>>
>>>> }
>>>>
>>>> Regards
>>>> Rajib
>>>>
>>>
>>> --
>>> Sincerely yours
>>> Mikhail Khludnev
>>>
>>>
>> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ft.me%2FMUST_SEARCH&data=05%7C01%7Crajib.saha%40sap.com%7C0bf8263294c94ff6180108db08338af0%7C42f7676cf455423c82f6dc2d99791af7%7C0%7C0%7C638112789690761979%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xIiE98I1EzpBl3El%2FhKjlGIBW8BNBvgfGXdvpUnMkwA%3D&reserved=0
>>> A caveat: Cyrillic!
>>>
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>>>
>>>
>> --
>> Sincerely yours
>> Mikhail Khludnev
>>
>> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ft.me%2FMUST_SEARCH&data=05%7C01%7Crajib.saha%40sap.com%7C0bf8263294c94ff6180108db08338af0%7C42f7676cf455423c82f6dc2d99791af7%7C0%7C0%7C638112789690761979%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xIiE98I1EzpBl3El%2FhKjlGIBW8BNBvgfGXdvpUnMkwA%3D&reserved=0
>> A caveat: Cyrillic!
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
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>>
>>
--
Uwe Schindler
Achterdiek 19, D-28357 Bremen
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