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https://issues.apache.org/jira/browse/HADOOP-2395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12550303
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stack commented on HADOOP-2395:
-------------------------------
This looks great Bryan.
Minor comment would be that things Strings such as "IN_MEMORY" should be made
into defines since it seems to be used in a few places.
I tried it and got this exception (Its hard to figure what the format for the
CHANGE column_spec should be -- maybe update the help string for ALTER in
HelpCommand?):
{code}
hql > alter table 'x' CHANGE x: MAX_VERSIONS=4;
Disabling x... Please wait.07/12/10 20:32:23 DEBUG hbase.HBaseAdmin: Sleep.
Waiting for first region to be disabled from x
07/12/10 20:32:33 DEBUG hbase.HBaseAdmin: Wake. Waiting for first region to be
disabled from x
07/12/10 20:32:33 INFO hbase.HBaseAdmin: Disabled table x
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String
index out of range: -24
at java.lang.String.substring(String.java:1768)
at
org.apache.hadoop.hbase.shell.BasicCommand.extractErrMsg(BasicCommand.java:64)
at
org.apache.hadoop.hbase.shell.BasicCommand.extractErrMsg(BasicCommand.java:68)
at
org.apache.hadoop.hbase.shell.AlterCommand.execute(AlterCommand.java:113)
at org.apache.hadoop.hbase.Shell.main(Shell.java:94)
durruti:~/Documents/checkouts/hadoop-trunk/src/contrib/hbase stack$ ./bin/hbase
shell
07/12/10 20:33:46 DEBUG shell.TableFormatterFactory: Table formatter class:
org.apache.hadoop.hbase.shell.formatter.AsciiTableFormatter
Hbase Shell, 0.0.2 version.
Copyright (c) 2007 by udanax, licensed to Apache Software Foundation.
Type 'help;' for usage.
hql > alter table 'x' CHANGE x: COMPRESSION=RECORD;
07/12/10 20:34:20 DEBUG hbase.HConnectionManager$TableServers: No servers for
.META.. Doing a find...
07/12/10 20:34:20 DEBUG hbase.HConnectionManager$TableServers: Found 1
region(s) for .META. at address: 192.168.1.135:53538, regioninfo: regionname:
-ROOT-,,0, startKey: <>, tableDesc: {name: -ROOT-, families: {info:={name:
info, max versions: 1, compression: NONE, in memory: false, max length:
2147483647, bloom filter: none}}}
Disabling x... Please wait.
07/12/10 20:34:20 INFO hbase.HBaseAdmin: Disabled table x
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String
index out of range: -24
at java.lang.String.substring(String.java:1768)
at
org.apache.hadoop.hbase.shell.BasicCommand.extractErrMsg(BasicCommand.java:64)
at
org.apache.hadoop.hbase.shell.BasicCommand.extractErrMsg(BasicCommand.java:68)
at
org.apache.hadoop.hbase.shell.AlterCommand.execute(AlterCommand.java:113)
at org.apache.hadoop.hbase.Shell.main(Shell.java:94)
~
{code}
> [hbase] Implement "ALTER TABLE ... CHANGE column" operation
> -----------------------------------------------------------
>
> Key: HADOOP-2395
> URL: https://issues.apache.org/jira/browse/HADOOP-2395
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Reporter: Bryan Duxbury
> Assignee: Bryan Duxbury
> Attachments: 2395.patch
>
>
> Right now, you can add or delete column families, but not change them once
> they are created. This is really inconvenient for things like adding
> compression or bloom filters to a column family once you get going. As new
> people come to HBase, they're going to make schema decisions that are
> incorrect and will need a way to modify their tables, so this is an important
> new feature.
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