when you look at the error prompt, it feels like there is not enough space, but it is not.
5 machines each have 20T disks, each with 8T left. But every time the index is created for about a day or so, an error will be reported.
error log is as follows:
2018-04-16 1515 CST, 55lane 45.450606 CST, "gp", "gp", p180444 Mathel 2040876928, "192.168.1.8", "25975", 2018-04-15 14:23:56 CST,376948,con289,cmd1,seg31,dx558714,x376948,sx1, "ERROR", "53100", "could not extend relation 1663384 could not extend relation 21258: No space left on device", "Check free disk space.", "create index index_table_name_bitmap_package on table_name USING btree (package); Smgr.c, 1335, "Stack trace:
1 0xae7486 postgres errstart (elog.c:503)
2 0x9ea06c postgres smgrextend (smgr.c:1329)
3 0x6db826 postgres < symbol not found > (nbtsort.c:338)
4 0x6dbc1a postgres < symbol not found > (nbtsort.c:602)
5 0x6dc7bf postgres _ bt_leafbuild (nbtsort.c:838)
6 0x6d716a postgres btbuild (nbtree.c:146)
7 0xaef042 postgres OidFunctionCall3 (fmgr.c:1595)
8 0x76a270 postgres index_build (index.c:1451)
9 0x76afdd postgres index_create (index.c)
10 0x8037c6 postgres DefineIndex (indexcmds.c:731)
11 0x9f5bdb postgres ProcessUtility (utility.c:1312)
12 0x9f2123 postgres < symbol not found > (pquery.c:1521)
13 0x9f3836 postgres < symbol not found > (pquery.c:1631)
14 0x9f49d5 postgres PortalRun (pquery.c:1129)
15 0x67c16e postgres < symbol not found > (discriminator 13)
16 0x9f0386 postgres PostgresMain (postgres.c:4819)
17 0x99776e postgres < symbol not found > (postmaster.c:6672)
18 0x999400 postgres PostmasterMain (postmaster.c:1559)
19 0x8d286b postgres C_main (main.c:206)
20 0x7f53837aeb35 libc.so.6 _ libc_start_main (?: 0)
21 0x69dcc1 postgres < symbol not found > (?

I made sure there was enough space, 20T space, 5 machines, each with 10 tables segment, and then left 8T before creating the index. Do you know why? Thank you