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  1. Terrier Core
  2. TR-289

Docid alignment is broken for MapReduce indexing when map tasks are repeated

          Details

          • Type: Bug
          • Status: Resolved
          • Priority: Critical
          • Resolution: Fixed
          • Affects Version/s: 3.6
          • Fix Version/s: 4.0
          • Component/s: None
          • Labels:
            None

            Description

            Recent indices created by MapReduce have docid alignment problems:

            Posting id 80368334 is too big for term 0 term0 Nt=34566754 TF=587985939 @{0 0 0} TFf=5215159,4448387,578322393
            Posting id 79259555 is too big for term d term21430718 Nt=22088033 TF=65422749 @{3 0 0} TFf=679062,312433,64431254

            This is /thought/ to be unrelated to compression changes.

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                craigm Craig Macdonald created issue -
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                craigm Craig Macdonald added a comment -

                This program can be used to test an index, used as follows:

                 bin/anyclass.sh  -Dterrier.index.path=/path/to/index -Dterrier.index.prefix=data  org.terrier.applications.PrintIndexTerm
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                craigm Craig Macdonald added a comment - This program can be used to test an index, used as follows: bin/anyclass.sh -Dterrier.index.path=/path/to/index -Dterrier.index.prefix=data org.terrier.applications.PrintIndexTerm
                craigm Craig Macdonald made changes -
                Field Original Value New Value
                Attachment PrintIndexTerm.java [ 10415 ]
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                richardm Richard McCreadie added a comment -

                I don't think that I am going to make much progress on this without the indexing MR logs. Can you attach them?

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                richardm Richard McCreadie added a comment - I don't think that I am going to make much progress on this without the indexing MR logs. Can you attach them?
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                craigm Craig Macdonald added a comment -

                This issue was found to be related to per-flush compression: the MapData contains information for per-flush compression, but this information may change if a map task is repeated.

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                craigm Craig Macdonald added a comment - This issue was found to be related to per-flush compression: the MapData contains information for per-flush compression, but this information may change if a map task is repeated.
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                craigm Craig Macdonald added a comment -

                Patch which disables per-flush compression in favour of per-map compression. This version for 3.6-ish.

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                craigm Craig Macdonald added a comment - Patch which disables per-flush compression in favour of per-map compression. This version for 3.6-ish.
                craigm Craig Macdonald made changes -
                Attachment TREC-388.v3.6.patch [ 10418 ]
                craigm Craig Macdonald made changes -
                Summary Docid alignment is broken for MapReduce indexing Docid alignment is broken for MapReduce indexing when map tasks are repeated
                craigm Craig Macdonald made changes -
                Assignee Richard McCreadie [ richardm ] Craig Macdonald [ craigm ]
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                craigm Craig Macdonald added a comment -

                TR v4 patch.

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                craigm Craig Macdonald added a comment - TR v4 patch.
                craigm Craig Macdonald made changes -
                Attachment TREC-388.v4.patch [ 10419 ]
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                craigm Craig Macdonald added a comment -

                Committed r3954.

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                craigm Craig Macdonald added a comment - Committed r3954.
                craigm Craig Macdonald made changes -
                Status Open [ 1 ] Resolved [ 5 ]
                Resolution Fixed [ 1 ]
                richardm Richard McCreadie made changes -
                Project TREC [ 10010 ] Terrier Core [ 10000 ]
                Key TREC-388 TR-289
                Workflow jira [ 10834 ] Terrier Open Source [ 10852 ]
                Affects Version/s 3.6 [ 10060 ]
                Affects Version/s 3.6 [ 10061 ]
                Component/s Core [ 10020 ]
                Fix Version/s 4.0 [ 10051 ]
                Fix Version/s 4.0 [ 10050 ]

                  People

                  • Assignee:
                    craigm Craig Macdonald
                    Reporter:
                    craigm Craig Macdonald
                  • Watchers:
                    0 Start watching this issue

                    Dates

                    • Created:
                      Updated:
                      Resolved: