I'm running a streaming replication setup with PostgreSQL 9.5.2 and have started seeing these errors on a few INSERTs:
ERROR: could not read block 8 in file "base/3884037/3885279": read only 0 of 8192 bytes
These errors are occurring on master or slave ?
on a few tables. If I look at that specific file, it's only 6 blocks long:
# ls -la base/3884037/3885279 -rw------- 1 postgres postgres 49152 May 30 12:56 base/3884037/3885279
It seems that this is the case on most tables in this state. I havn't seen any error on SELECT and I can SELECT * on the all tables I know have this problem. The database is machine is under reasonable load.
So, the filenodes generating this error belong to a Table ? or an Index ?
On some tables an "ANALYZE tablename" causes the error.
We recently had a streaming replication failover after loading a large amount of data with pg_restore. The problems seem to have started after that, but I'm not perfectly sure.
pg_restore has completed successfully ? When pg_restore was running, did you see anything suspicious in the postgresql logfiles ?
I have data_checksums switched on so am suspecting a streaming replication bug. Anyone know of a recent bug which could have caused this?
I cannot conclude at this point. I encountered these kind of errors with Indexes and re-indexing fixed them.
