[kudu] branch master updated (2ba4edc -> 37f780f)

[al...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

alexey pushed a change to branch master
in repository https://gitbox.apache.org/repos/asf/kudu.git.


    from 2ba4edc  [thirdparty] drop unused libcurl features
     new 477608e  [docs] fix typo in tablet-history-gc.md
     new 37f780f  [docs] note about space reclamation for deleted rows

The 2 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.


Summary of changes:
 docs/design-docs/tablet-history-gc.md |  2 +-
 docs/schema_design.adoc               | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

[kudu] 02/02: [docs] note about space reclamation for deleted rows

[al...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

alexey pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/kudu.git

commit 37f780f00a5a5fdb754ac952896f6c3368d4256d
Author: Alexey Serbin <al...@apache.org>
AuthorDate: Thu Jan 30 12:36:01 2020 -0800

    [docs] note about space reclamation for deleted rows
    
    Added a note about not reclaiming the space after deleting rows from
    a table, urging for a proper schema design for larger fact tables.
    
    Change-Id: Ib49e86ed80af0325e3ceaceb9964749534755be4
    Reviewed-on: http://gerrit.cloudera.org:8080/15138
    Reviewed-by: Adar Dembo <ad...@cloudera.com>
    Tested-by: Kudu Jenkins
---
 docs/schema_design.adoc | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/docs/schema_design.adoc b/docs/schema_design.adoc
index 3ecceed..9b05991 100644
--- a/docs/schema_design.adoc
+++ b/docs/schema_design.adoc
@@ -570,3 +570,14 @@ Non-alterable Column Types:: Kudu does not allow the type of a column to be
 altered.
 
 Partition Splitting:: Partitions cannot be split or merged after table creation.
+
+Deleted row disk space is not reclaimed:: The disk space occupied by a deleted
+row is only reclaimable via compaction, and only when the deletion's age
+exceeds the "tablet history maximum age" (controlled by the
+`--tablet_history_max_age_sec` flag). Furthermore, Kudu currently only schedules
+compactions in order to improve read/write performance; a tablet will never be
+compacted purely to reclaim disk space. As such, range partitioning should be
+used when it is expected that large swaths of rows will be discarded. With range
+partitioning, individual partitions may be dropped to discard data and reclaim
+disk space.  See link:https://issues.apache.org/jira/browse/KUDU-1625[KUDU-1625]
+for details.

[kudu] 01/02: [docs] fix typo in tablet-history-gc.md

[al...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

alexey pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/kudu.git

commit 477608e4141d63c51f89377fddcefcd19d38a5e5
Author: Alexey Serbin <al...@apache.org>
AuthorDate: Thu Jan 30 11:09:14 2020 -0800

    [docs] fix typo in tablet-history-gc.md
    
    Change-Id: I5a2f62d2d8e676f2fb151897daa1b7c8a3900831
    Reviewed-on: http://gerrit.cloudera.org:8080/15135
    Tested-by: Kudu Jenkins
    Reviewed-by: Adar Dembo <ad...@cloudera.com>
---
 docs/design-docs/tablet-history-gc.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/design-docs/tablet-history-gc.md b/docs/design-docs/tablet-history-gc.md
index 95653ab..a53a3a2 100644
--- a/docs/design-docs/tablet-history-gc.md
+++ b/docs/design-docs/tablet-history-gc.md
@@ -81,5 +81,5 @@ deleted rows. However, at the time of writing, this is not implemented because
 it appears to be prone to causing write amplification.
 
 UndoDeltaBlockGCOp, in contrast, only removes delta history associated with a
-row. If a row is deleted, UndoDeltaBlockGCO0p will not remove the row's base
+row. If a row is deleted, UndoDeltaBlockGCOp will not remove the row's base
 data or the final REDO record indicating its deletion.