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https://issues.apache.org/jira/browse/HBASE-4358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100824#comment-13100824
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[email protected] commented on HBASE-4358:
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https://reviews.apache.org/r/1768/
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Review request for hbase.
Summary
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Currently, the RPC provides no way of asking for several table alterations at
once, and the master has no way of batch handling alter requests. Thus, when
the user requests several changes at the same time (i.e. add these I columns,
delete these J columns, and modify these K columns), each region is brought
down (I+J+K) times so that it can reflect the new schema. Additionally,
multiple writes are made to META, and multiple RPC calls must be made.
This patch provides batching for these operations, both at the RPC level and
within the Master's TableEventHandlers. This involves a bit of reorganization
in the TableEventHandler class hierarchy, and a new TableEventHandler,
TableMultiFamilyHandler. The net effect ends up being the difference seen here:
Before patch:
hbase(main):001:0> alter 'peeps', {NAME => 'rawr'}, {METHOD => 'delete', NAME
=> 'name'}
Updating all regions with the new schema...
1/1 regions updated.
Done.
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 2.6450 seconds
After patch:
hbase(main):002:0> alter 'peeps', {NAME => 'rawr'}, {METHOD => 'delete', NAME
=> 'name'}
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 1.1930 seconds
Regions are only brought down once, and the duration is cut 1/N.
This addresses bug HBASE-4358.
https://issues.apache.org/jira/browse/HBASE-4358
Diffs
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/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java 1166933
/src/main/java/org/apache/hadoop/hbase/coprocessor/BaseMasterObserver.java
1166933
/src/main/java/org/apache/hadoop/hbase/coprocessor/MasterObserver.java
1166933
/src/main/java/org/apache/hadoop/hbase/executor/EventHandler.java 1166933
/src/main/java/org/apache/hadoop/hbase/ipc/HMasterInterface.java 1166933
/src/main/java/org/apache/hadoop/hbase/master/HMaster.java 1166933
/src/main/java/org/apache/hadoop/hbase/master/MasterCoprocessorHost.java
1166933
/src/main/java/org/apache/hadoop/hbase/master/handler/TableAddFamilyHandler.java
1166933
/src/main/java/org/apache/hadoop/hbase/master/handler/TableDeleteFamilyHandler.java
1166933
/src/main/java/org/apache/hadoop/hbase/master/handler/TableFamilyHandler.java
PRE-CREATION
/src/main/java/org/apache/hadoop/hbase/master/handler/TableModifyFamilyHandler.java
1166933
/src/main/java/org/apache/hadoop/hbase/master/handler/TableMultiFamilyHandler.java
PRE-CREATION
/src/main/ruby/hbase/admin.rb 1166933
/src/test/java/org/apache/hadoop/hbase/coprocessor/TestMasterObserver.java
1166933
Diff: https://reviews.apache.org/r/1768/diff
Testing
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Sanity checked functionality in psuedo-distributed mode (tried several
permutations of different alterations, all completed successfully and with only
one round of region restarts). Ran unit tests I thought were relevant, which
passed. In the process of running all unit tests.
Thanks,
Riley
> Batch Table Alter Operations
> ----------------------------
>
> Key: HBASE-4358
> URL: https://issues.apache.org/jira/browse/HBASE-4358
> Project: HBase
> Issue Type: Improvement
> Components: ipc, master, shell
> Affects Versions: 0.92.0
> Reporter: Riley Patterson
> Assignee: Riley Patterson
> Priority: Minor
> Attachments: HBASE-4358.patch
>
>
> Currently, the RPC provides no way of asking for several table alterations at
> once, and the master has no way of batch handling alter requests. Thus, when
> the user requests several changes at the same time (i.e. add these I columns,
> delete these J columns, and modify these K columns), each region is brought
> down (I+J+K) times so that it can reflect the new schema. Additionally,
> multiple writes are made to META, and multiple RPC calls must be made.
> This patch provides batching for these operations, both at the RPC level and
> within the Master's TableEventHandlers. This involves a bit of reorganization
> in the TableEventHandler class hierarchy, and a new TableEventHandler,
> TableMultiFamilyHandler. The net effect ends up being the difference seen
> here:
> Before patch:
> hbase(main):001:0> alter 'peeps', {NAME => 'rawr'}, {METHOD => 'delete', NAME
> => 'name'}
> Updating all regions with the new schema...
> 1/1 regions updated.
> Done.
> Updating all regions with the new schema...
> 1/1 regions updated.
> Done.
> 0 row(s) in 2.6450 seconds
> After patch:
> hbase(main):002:0> alter 'peeps', {NAME => 'rawr'}, {METHOD => 'delete', NAME
> => 'name'}
> Updating all regions with the new schema...
> 1/1 regions updated.
> Done.
> 0 row(s) in 1.1930 seconds
> Regions are only brought down once, and the duration is cut 1/N.
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