EdColeman opened a new pull request, #4116:
URL: https://github.com/apache/accumulo/pull/4116
The utility creates an empty wal file with a version 4 header. This
parallels the CreateEmpty utility to generate an empty RFile.
A hex dump of a created file.
```
00000000 2d 2d 2d 20 4c 6f 67 20 46 69 6c 65 20 48 65 61 |--- Log File
Hea|
00000010 64 65 72 20 28 76 34 29 20 2d 2d 2d 00 00 00 07 |der (v4)
---....|
00000020 55 2b 31 46 34 37 42 00 00 00 00 02 00 00 00 00
|U+1F47B.........|
00000030 00 00 |..|
00000032
```
The created file can be read by the wal-info utility
```
2023-12-22T19:46:22,240 [conf.SiteConfiguration] INFO : Found Accumulo
configuration on classpath at
[deleted]/fluo-uno/install/accumulo-3.1.0-SNAPSHOT/conf/accumulo.properties
OPEN
2023-12-22T19:46:23,310 [logger.LogReader] INFO : Done reading
/accumulo/empty/e1.wal
```
I did test this using an uno instance, by kill the tserver, replaceing the
wal that didn't have mutations and the then restarted the tserver.
Relevant log fragments: (the wal replaced with the generated empty was
48857908-d9c2-48ec-8bb0-5d3e9ca2cce4)
<details>
<summary>tserver log on recovery</summary>
2023-12-22T16:53:07,533 [log.LogSorter] INFO : Finished log sort
48857908-d9c2-48ec-8bb0-5d3e9ca2cce4 50 bytes 1 parts in 211ms
2023-12-22T16:53:07,536 [log.LogSorter] INFO : Finished log sort
7b435c97-4952-476f-8862-a6cc79f0cd3d 6684 bytes 1 parts in 212ms
...
2023-12-22T16:53:27,885 [log.SortedLogRecovery] INFO : Found 1 of 2 logs
with max id 1 for tablet +r<<
2023-12-22T16:53:27,896 [log.SortedLogRecovery] INFO : Recovering mutations,
tablet:+r<< tabletId:1 seq:30 logs:[7b435c97-4952-476f-8862-a6cc79f0cd3d]
2023-12-22T16:53:27,924 [tablet.recovery] INFO : For +r<< recovered 0
mutations creating 0 entries from 0 walogs
2023-12-22T16:53:27,948 [tserver.TabletClientHandler] INFO : Root tablet
loaded: +r<<
2023-12-22T16:53:28,258 [tserver.TabletServer] INFO : Writing log marker for
hdfs://localhost:8020/accumulo/wal/ip-10-113-15-130+9997/80e442de-23d7-413f-9612-dc542c54a319
2023-12-22T16:53:28,262 [log.TabletServerLogger] INFO : Using next log
hdfs://localhost:8020/accumulo/wal/ip-10-113-15-130+9997/80e442de-23d7-413f-9612-dc542c54a319
2023-12-22T16:53:28,293 [tserver.TabletServer] INFO : Writing log marker for
hdfs://localhost:8020/accumulo/wal/ip-10-113-15-130+9997/443901c3-53cf-4275-a4d0-a9f18b60f735
2023-12-22T16:53:28,478 [log.SortedLogRecovery] INFO : Tablet !0<;~ is not
defined in recovery logs [48857908-d9c2-48ec-8bb0-5d3e9ca2cce4,
7b435c97-4952-476f-8862-a6cc79f0cd3d]
2023-12-22T16:53:28,509 [tablet.recovery] INFO : For !0<;~ recovered 0
mutations creating 0 entries from 0 walogs
2023-12-22T16:53:28,566 [log.SortedLogRecovery] INFO : Tablet !0;~< is not
defined in recovery logs [48857908-d9c2-48ec-8bb0-5d3e9ca2cce4,
7b435c97-4952-476f-8862-a6cc79f0cd3d]
2023-12-22T16:53:28,575 [tablet.recovery] INFO : For !0;~< recovered 0
mutations creating 0 entries from 0 walogs
</details>
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