chengw-netflix opened a new pull request, #3628:
URL: https://github.com/apache/cassandra/pull/3628
**Summary**
This PR introduces a **-H** option to the **nodetool compactionhistory**
command Cassandra. The **-H** option formats the output in a human-readable
manner, making it easier for users to interpret the data.
More specifically, when the -H option is used, the **bytes_in** and
**bytes_out** fields are displayed in a more readable format (e.g., KiB).
**Testing**
1. Without -H option:
```
Compaction History:
id keyspace_name columnfamily_name
compacted_at bytes_in bytes_out rows_merged compaction_properties
2a5355b0-90f0-11ef-bf8c-79bcdbb5790b system_schema tables
2024-10-22T20:37:44.986 10526 3985 {2:4, 3:2}
{compaction_type:Compaction}
2a348310-90f0-11ef-bf8c-79bcdbb5790b system_schema keyspaces
2024-10-22T20:37:44.779 808 312 {2:4, 3:2}
{compaction_type:Compaction}
```
2. With -H option:
```
Compaction History:
id keyspace_name columnfamily_name
compacted_at bytes_in bytes_out rows_merged compaction_properties
2a5355b0-90f0-11ef-bf8c-79bcdbb5790b system_schema tables
2024-10-22T20:37:44.986 10.28 KiB 3.89 KiB {2:4, 3:2}
{compaction_type:Compaction}
2a348310-90f0-11ef-bf8c-79bcdbb5790b system_schema keyspaces
2024-10-22T20:37:44.779 808 bytes 312 bytes {2:4, 3:2}
{compaction_type:Compaction}
```
3. With -F json option:
```
{
"CompactionHistory" : [ {
"keyspace_name" : "system_schema",
"bytes_out" : "3985",
"bytes_in" : "10526",
"compaction_properties" : "{compaction_type:Compaction}",
"columnfamily_name" : "tables",
"rows_merged" : "{2:4, 3:2}",
"id" : "2a5355b0-90f0-11ef-bf8c-79bcdbb5790b",
"compacted_at" : "2024-10-22T20:37:44.986"
}
```
4. With -F json -H option:
```
{
"CompactionHistory" : [ {
"keyspace_name" : "system_schema",
"bytes_out" : "3.89 KiB",
"bytes_in" : "10.28 KiB",
"compaction_properties" : "{compaction_type:Compaction}",
"columnfamily_name" : "tables",
"rows_merged" : "{2:4, 3:2}",
"id" : "2a5355b0-90f0-11ef-bf8c-79bcdbb5790b",
"compacted_at" : "2024-10-22T20:37:44.986"
},
```
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