Attached is a patch that fixes overflow of bgwriter's file-fsync request queue.

It happened on heavy update workloads and the performance decreased.
I have sent HACKERS the detail.

ITAGAKI Takahiro
NTT Cyber Space Laboratories

Attachment: bgwriter-requests-queue-overflow-2.patch
Description: Binary data

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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