Which class file trigger writing of segments.gen / segments_1


(Jason Wee) #1

Hello people,

Anybody know which class/component in elastic search trigger writing
of segments.gen and segments_1? I'm currently using elastic search version
1.2.1. It would be great if you can provide link pin point which line in
the class does that.

Thank you.

/Jason

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(Jörg Prante) #2

This is Lucene, when indexing starts. Look at the SegmentsInfo class
https://lucene.apache.org/core/4_9_0/core/org/apache/lucene/index/SegmentInfos.html

Jörg

On Fri, Aug 29, 2014 at 2:38 PM, Jason Wee peichieh@gmail.com wrote:

Hello people,

Anybody know which class/component in elastic search trigger writing
of segments.gen and segments_1? I'm currently using elastic search version
1.2.1. It would be great if you can provide link pin point which line in
the class does that.

Thank you.

/Jason

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(Jason Wee) #3

Thanks Jörg,

read this link
https://lucene.apache.org/core/4_8_1/core/org/apache/lucene/index/SegmentInfos.html
, very informative.

Found a few spots that call the class SegmentInfos, below are them.





I understand that both segments file are written by Lucene but during
index, do you know which class in elasticsearch that eventually lead to
trigger the underlying writing of segments file?

/Jason

On Fri, Aug 29, 2014 at 8:49 PM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

This is Lucene, when indexing starts. Look at the SegmentsInfo class
https://lucene.apache.org/core/4_9_0/core/org/apache/lucene/index/SegmentInfos.html

Jörg

On Fri, Aug 29, 2014 at 2:38 PM, Jason Wee peichieh@gmail.com wrote:

Hello people,

Anybody know which class/component in elastic search trigger writing
of segments.gen and segments_1? I'm currently using elastic search version
1.2.1. It would be great if you can provide link pin point which line in
the class does that.

Thank you.

/Jason

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(Jörg Prante) #4

All the classes in ES that create documents and indices are able to be
involved into calling SegmentInfos.

Jörg

On Fri, Aug 29, 2014 at 5:30 PM, Jason Wee peichieh@gmail.com wrote:

Thanks Jörg,

read this link
https://lucene.apache.org/core/4_8_1/core/org/apache/lucene/index/SegmentInfos.html
, very informative.

Found a few spots that call the class SegmentInfos, below are them.

https://github.com/elasticsearch/elasticsearch/blob/v1.2.1/src/main/java/org/elasticsearch/index/gateway/local/LocalIndexShardGateway.java

https://github.com/elasticsearch/elasticsearch/blob/v1.2.1/src/main/java/org/elasticsearch/common/lucene/Lucene.java

https://github.com/elasticsearch/elasticsearch/blob/v1.2.1/src/main/java/org/elasticsearch/index/engine/internal/InternalEngine.java

https://github.com/elasticsearch/elasticsearch/blob/v1.2.1/src/main/java/org/elasticsearch/index/merge/policy/ElasticsearchMergePolicy.java

https://github.com/elasticsearch/elasticsearch/blob/v1.2.1/src/main/java/org/elasticsearch/index/snapshots/blobstore/BlobStoreIndexShardRepository.java

I understand that both segments file are written by Lucene but during
index, do you know which class in elasticsearch that eventually lead to
trigger the underlying writing of segments file?

/Jason

On Fri, Aug 29, 2014 at 8:49 PM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

This is Lucene, when indexing starts. Look at the SegmentsInfo class
https://lucene.apache.org/core/4_9_0/core/org/apache/lucene/index/SegmentInfos.html

Jörg

On Fri, Aug 29, 2014 at 2:38 PM, Jason Wee peichieh@gmail.com wrote:

Hello people,

Anybody know which class/component in elastic search trigger writing
of segments.gen and segments_1? I'm currently using elastic search version
1.2.1. It would be great if you can provide link pin point which line in
the class does that.

Thank you.

/Jason

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(system) #5