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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: WT2.8.0
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Component/s: None
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Labels:None
Hi!
We found that sometimes our application hangs (either forever or for a very long time) when inserting data to WT DB.
Looks like the problem is in insufficient cache size since increasing it helps.
Moreover I can reliable reproduce the hang by setting small cache size (e.g. 16M when DB is ~ 31M).
Thread that does the insert has the following stack:
pthread_cond_timedwait __wt_cond_wait_signal __wt_cond_wait __wt_cache_eviction_worker __wt_cache_eviction_check __cursor_enter __curfile_enter __cursor_func_init __wt_btcur_insert __curfile_insert __curtable_insert <application frames>
After that application is unable to open cursors on the table:
00007f912a7eff4d __lll_lock_wait + 0x1d 00007f912a7ebd02 _L_lock_791 + 0xf 00007f912a7ebc08 pthread_mutex_lock + 0x38 00007f912baf3f69 __wt_spin_lock + 0x19 00007f912baf33ec __schema_add_table + 0x17c 00007f912baf308b __wt_schema_get_table + 0x7b 00007f912ba94b0d __wt_curtable_open + 0x12d 00007f912bb01902 __session_open_cursor_int + 0xc2 00007f912bb04147 __session_open_cursor + 0x437
or
00007f912a7eda82 pthread_cond_timedwait + 0x132 00007f912baca42b __wt_cond_wait_signal + 0x1db 00007f912ba9ae79 __wt_cond_wait + 0x29 00007f912ba9a9c5 __wt_cache_eviction_worker + 0x2d5 00007f912ba08675 __wt_cache_eviction_check + 0x125 00007f912ba08871 __cursor_enter + 0x31 00007f912ba084fc __curfile_enter + 0x3c 00007f912ba04f01 __cursor_func_init + 0xb1 00007f912ba04761 __wt_btcur_search + 0x211 00007f912ba706ea __curfile_search + 0x31a 00007f912baf5bd9 __schema_open_table + 0x179 00007f912baf59f5 __wt_schema_open_table + 0x135 00007f912baf3423 __schema_add_table + 0x1b3 00007f912baf308b __wt_schema_get_table + 0x7b 00007f912ba94b0d __wt_curtable_open + 0x12d 00007f912bb01902 __session_open_cursor_int + 0xc2 00007f912bb04147 __session_open_cursor + 0x437
I can see this behavior with WT2.8.0, WT2.6.1 and in current 'develop' branch.
Thanks!
