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  1. WiredTiger
  2. WT-1361

Assertion failure in LSM

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    Details

    • Type: Task
    • Status: Closed
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: WT2.5.0
    • Component/s: None
    • Labels:
      None

      Description

      When running a YCSB workload through MongoDB it's possible to trigger an assertion in WiredTiger.

      The failure is:

      After about 10 minutes I get:
      2014-11-07T19:36:50.935-0500 I WRITES   [conn7] insert ycsb.bulk1 ninserted:1 keyUpdates:0 numYields:0  123ms
      Segmentation fault (core dumped)
      

      The assertion is:

      #0  0x0000000000000000 in ?? ()
      WT-1  0x00007fe56cd6661a in __wt_compare (cmpp=0x7fe567bf37d0, tree_item=0x207b9a88, user_item=0x94efd48, collator=<optimized out>, 
          session=0x3f97400) at ./src/include/btree.i:1162
      WT-2  __clsm_get_current (session=0x3f97400, clsm=0x642e4e0, smallest=1, deletedp=0x7fe567bf3840) at src/lsm/lsm_cursor.c:691
      WT-3  0x00007fe56cd680fb in __clsm_next (cursor=0x642e4e0) at src/lsm/lsm_cursor.c:830
      WT-4  0x00007fe56cd6d194 in __wt_lsm_merge (session=0x3f97400, lsm_tree=0x5255800, id=<optimized out>) at src/lsm/lsm_merge.c:311
      WT-5  0x00007fe56cd725f8 in __lsm_worker (arg=0x3f90fe0) at src/lsm/lsm_worker.c:137
      WT-6  0x00007fe56cac9e9a in start_thread (arg=0x7fe567bf4700) at pthread_create.c:308
      WT-7  0x00007fe56bbd931d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
      WT-8  0x0000000000000000 in ?? ()
      

      The steps to reproduce are:

      $ rm -r /tmp/wt/*
      $ LD_LIBRARY_PATH=$WT_INSTALL/lib ./mongod --storageEngine wiredtiger --dbpath /tmp/wt --wiredTigerCollectionConfig "type=lsm" --wiredTigerIndexConfig "type=lsm"
      $ ./mongo
      > use ycsb
      > db.bulk1.ensureIndex({field0:1})
      $ ./bin/ycsb load mongodb  -P workloads/workloada -p recordcount=1000000 -p table=bulk1 -threads 8 -s
      

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              • Assignee:
                Unassigned
                Reporter:
                alexander.gorrod Alexander Gorrod
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                • Created:
                  Updated:
                  Resolved: