apurtell edited a comment on pull request #3244:
URL: https://github.com/apache/hbase/pull/3244#issuecomment-837051331
**WAL Compression Results**
Site configuration:
<!-- retain all WALs -->
<property>
<name>hbase.master.logcleaner.ttl</name>
<value>604800000</value>
</property>
<!-- to enable compression -->
<property>
<name>hbase.regionserver.wal.enablecompression</name>
<value>true</value>
</property>
<!-- to enable value compression -->
<property>
<name>hbase.regionserver.wal.value.enablecompression</name>
<value>true</value>
</property>
IntegrationTestLoadCommonCrawl
Input:
s3n://commoncrawl/crawl-data/CC-MAIN-2021-10/segments/1614178347293.1/warc/CC-MAIN-20210224165708-20210224195708-00000.warc.gz
| Mode | WALs aggregate size | Difference |
| -- | -- | -- |
Default | 5,006,963,824 | - |
Compression enabled, value compression not enabled | 5,006,874,201 | (0.1%) |
Compression enabled, value compression enabled | 940,657,251 | (81.2%) |
In this test case WAL compression without value compression is not enough.
The schema is already optimized for space efficiency: column families and
qualifiers are single characters. There is a bit of redundancy that can be
reclaimed but the bulky values (web crawl results) dominate.
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