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Commitd4e1f97

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maksm90akorotkov
authored andcommitted
Fix termination of sequential scans of sample profile hash table
When pg_wait_sampling sends a sample profile to caller backend itinitializes a new session of sequential scan for internal hash table.This session is tracked by internal counter 'num_seq_scans' that isbound above by some constant thresold. If caller interrupts process ofprofile receiving from message queue collector doesn't decrementinternal counter of hash table that cause its threshold crossing.Thus fix releases a sequencial scan session explicitely even ifabort of interaction process was appeared.
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‎collector.c

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Original file line numberDiff line numberDiff line change
@@ -266,6 +266,7 @@ send_profile(HTAB *profile_hash, shm_mq_handle *mqh)
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mq_result=shm_mq_send(mqh,sizeof(ProfileItem),item, false);
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if (mq_result==SHM_MQ_DETACHED)
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{
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hash_seq_term(status);
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ereport(WARNING,
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(errmsg("pg_wait_sampling collector: "
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"receiver of message queue have been detached")));

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