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https://issues.apache.org/jira/browse/LUCENE-6192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292536#comment-14292536
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Tom Burton-West commented on LUCENE-6192:
-----------------------------------------
Patch works! Thanks Mike!
Deployed Solr war with the patch and ran optimize on 12 shards. All
CheckIndexes passed.
Below are some of the stats on one of the shards.
Tom
About 1 million docs and 700GB index with about 4 billion unique terms, 270
billion tokens
docCount=1086381
size (MB)=693,308.47
test: terms, freq, prox...OK [4113882974 terms; 61631126560 terms/docs
pairs; 270670957886 tokens]
field "ocr":
index FST:
27157406 nodes
77300582 arcs
1262090664 bytes
terms:
4087713620 terms
50227574334 bytes (12.3 bytes/term)
blocks:
132202225 blocks
96419097 terms-only blocks
40757 sub-block-only blocks
35742371 mixed blocks
27202047 floor blocks
44718055 non-floor blocks
87484170 floor sub-blocks
23560113026 term suffix bytes (178.2 suffix-bytes/block)
8227225977 term stats bytes (62.2 stats-bytes/block)
19664735257 other bytes (148.7 other-bytes/block)
by prefix length:
> Long overflow in LuceneXXSkipWriter can corrupt skip data
> ---------------------------------------------------------
>
> Key: LUCENE-6192
> URL: https://issues.apache.org/jira/browse/LUCENE-6192
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 5.0, Trunk, 4.x
>
> Attachments: LUCENE-6192.patch
>
>
> I've been iterating with Tom on this corruption that CheckIndex detects in
> his rather large index (720 GB in a single segment):
> {noformat}
> java -Xmx16G -Xms16G -cp $JAR -ea:org.apache.lucene...
> org.apache.lucene.index.CheckIndex /XXXX/shards/4/core-1/data/test_index
> -verbose 2>&1 |tee -a shard4_reoptimizedNewJava
> Opening index @ /htsolr/lss-reindex/shards/4/core-1/data/test_index
> Segments file=segments_e numSegments=1 version=4.10.2 format=
> userData={commitTimeMSec=1421479358825}
> 1 of 1: name=_8m8 docCount=1130856
> version=4.10.2
> codec=Lucene410
> compound=false
> numFiles=10
> size (MB)=719,967.32
> diagnostics = {timestamp=1421437320935, os=Linux,
> os.version=2.6.18-400.1.1.el5, mergeFactor=2, source=merge,
> lucene.version=4.10.2, os.arch=amd64, mergeMaxNumSegments=1,
> java.version=1.7.0_71, java.vendor=Oracle Corporation}
> no deletions
> test: open reader.........OK
> test: check integrity.....OK
> test: check live docs.....OK
> test: fields..............OK [80 fields]
> test: field norms.........OK [23 fields]
> test: terms, freq, prox...ERROR: java.lang.AssertionError: -96
> java.lang.AssertionError: -96
> at
> org.apache.lucene.codecs.lucene41.ForUtil.skipBlock(ForUtil.java:228)
> at
> org.apache.lucene.codecs.lucene41.Lucene41PostingsReader$BlockDocsAndPositionsEnum.skipPositions(Lucene41PostingsReader.java:925)
> at
> org.apache.lucene.codecs.lucene41.Lucene41PostingsReader$BlockDocsAndPositionsEnum.nextPosition(Lucene41PostingsReader.java:955)
> at
> org.apache.lucene.index.CheckIndex.checkFields(CheckIndex.java:1100)
> at
> org.apache.lucene.index.CheckIndex.testPostings(CheckIndex.java:1357)
> at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:655)
> at org.apache.lucene.index.CheckIndex.main(CheckIndex.java:2096)
> test: stored fields.......OK [67472796 total field count; avg 59.665
> fields per doc]
> test: term vectors........OK [0 total vector count; avg 0 term/freq
> vector fields per doc]
> test: docvalues...........OK [0 docvalues fields; 0 BINARY; 0 NUMERIC; 0
> SORTED; 0 SORTED_NUMERIC; 0 SORTED_SET]
> FAILED
> WARNING: fixIndex() would remove reference to this segment; full
> exception:
> java.lang.RuntimeException: Term Index test failed
> at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:670)
> at org.apache.lucene.index.CheckIndex.main(CheckIndex.java:2096)
> WARNING: 1 broken segments (containing 1130856 documents) detected
> WARNING: would write new segments file, and 1130856 documents would be lost,
> if -fix were specified
> {noformat}
> And Rob spotted long -> int casts in our skip list writers that look like
> they could cause such corruption if a single high-freq term with many
> positions required > 2.1 GB to write its positions into .pos.
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