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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 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
                Show
                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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                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.
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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.
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                craigm Craig Macdonald added a comment -

                Committed r3954.

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                craigm Craig Macdonald added a comment - Committed r3954.

                  People

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

                    Dates

                    • Created:
                      Updated:
                      Resolved: