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https://issues.apache.org/jira/browse/HBASE-6868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-6868:
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Attachment: 6868-0.96-v3.txt
This is what I meant.
Now we document that:
* dfs.client.read.shortcircuit should true
* dfs.client.read.shortcircuit.skip.checksum should be false
That way this is no longer tied to short circuiting in the code. And if short
circuiting happens to be enabled it is always correct to enable
dfs.client.read.shortcircuit.skip.checksum if we want HBase checksum.
Sounds good?
> Skip checksum is broke; are we double-checksumming by default?
> --------------------------------------------------------------
>
> Key: HBASE-6868
> URL: https://issues.apache.org/jira/browse/HBASE-6868
> Project: HBase
> Issue Type: Bug
> Components: HFile, wal
> Affects Versions: 0.94.0, 0.94.1
> Reporter: LiuLei
> Priority: Blocker
> Fix For: 0.94.3, 0.96.0
>
> Attachments: 6868-0.96-idea.txt, 6868-0.96-v2.txt, 6868-0.96-v3.txt
>
>
> The HFile contains checksums for decrease the iops, so when Hbase read HFile
> , that dont't need to read the checksum from meta file of HDFS. But HLog
> file of Hbase don't contain the checksum, so when HBase read the HLog, that
> must read checksum from meta file of HDFS. We could add setSkipChecksum per
> file to hdfs or we could write checksums into WAL if this skip checksum
> facility is enabled
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