[ISSUE] (TEPHRA-45) Support empty values in HBase 0.98+

[Gary Helmling (JIRA)]

Gary Helmling updated an issue

Tephra / TEPHRA-45 Support empty values in HBase 0.98+ Change By: Gary Helmling Labels: phoenix Add Comment

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[Gary Helmling (JIRA)]

Gary Helmling commented on an issue

Re: Support empty values in HBase 0.98+ Cell tags themselves are supported in HBase 0.98+, but the new HFile format version 3, which is required to persist cell tags, is only enabled by default in HBase 1.0+. So we will either need to limit this feature to HBase 1.0+, or conditionally enable it on HBase 0.98+ if the HFile format being used is 3+. Without this, we would lose the cell tags identifying the delete markers when those cells are flushed to a store file.

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Tephra / TEPHRA-45 Support empty values in HBase 0.98+

Tephra currently handles Delete operations by issuing a Put with an empty byte[] value and interpreting this as a delete tombstone when reading data back. This makes it possible to rollback a Tephra "delete" from a failed transaction with a native HBase Delete issued at the same column/timestamp. With support for cell tags in HBase 0.98+, we can do be...

[Gary Helmling (JIRA)]

Gary Helmling updated an issue

Tephra / TEPHRA-45

Support empty values in HBase 1.0+ Change By: Gary Helmling Summary: Support empty values in HBase  0  1 . 98 0 + Component/s: hbase-compat-0.98

Tephra currently handles Delete operations by issuing a Put with an empty byte[] value and interpreting this as a delete tombstone when reading data back.  This makes it possible to rollback a Tephra "delete" from a failed transaction with a native HBase Delete issued at the same column/timestamp.

With support for cell tags in HBase  0  1 . 98 0 +  (where HFile v3 is enabled by default) , we can do better than this, by setting a cell tag indicating that the Put is actually a "delete".  This will allow us to correctly distinguish between a Put with an empty value and a delete tombstone.

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