Thanks everyone for your help On Mon, Jul 23, 2012 at 1:40 PM, Mohammad Tariq <[email protected]> wrote:
> Also, we don't have to worry about compaction under normal conditions. > When something is written to HBase, it is first written to an > in-memory store (memstore), once this memstore reaches a certain size, > it is flushed to disk into a store file (everything is also written > immediately to a log file for durability). The store files created on > disk are immutable. Sometimes the store files are merged together, > this is done by a process called compaction. > > Regards, > Mohammad Tariq > > > On Tue, Jul 24, 2012 at 2:00 AM, Mohammad Tariq <[email protected]> > wrote: > > The HBase processes exposes a web-based user interface (in short UI), > > which you can use to gain insight into the cluster's state, as well as > > the tables it hosts. Just point your web browser to > > "http://hmaster:60010";. Although majority of the functionality is > > read-only, but there are a few selected operation you can trigger > > through the UI(like splitting and compaction). > > > > Regards, > > Mohammad Tariq > > > > > > On Tue, Jul 24, 2012 at 1:56 AM, Rob Roland <[email protected]> > wrote: > >> You don't have to run the major compaction - the shell is doing that for > >> you. You must disable the table first, like: > >> > >> disable 'session_timeline' > >> drop 'session_timeline' > >> > >> See the admin.rb file: > >> > >> def drop(table_name) > >> tableExists(table_name) > >> raise ArgumentError, "Table #{table_name} is enabled. Disable it > >> first.'" if enabled?(table_name) > >> > >> @admin.deleteTable(table_name) > >> flush(org.apache.hadoop.hbase.HConstants::META_TABLE_NAME) > >> major_compact(org.apache.hadoop.hbase.HConstants::META_TABLE_NAME) > >> end > >> > >> On Mon, Jul 23, 2012 at 1:22 PM, Mohit Anchlia <[email protected] > >wrote: > >> > >>> Thanks! but I am still trying to understand these 2 questions: > >>> > >>> 1. How to see if this table has more than one region? > >>> 2. And why do I need to run major compact if I have more than one > region? > >>> > >>> On Mon, Jul 23, 2012 at 1:14 PM, Mohammad Tariq <[email protected]> > >>> wrote: > >>> > >>> > Hi Mohit, > >>> > > >>> > A table must be disabled first in order to get deleted. > >>> > Regards, > >>> > Mohammad Tariq > >>> > > >>> > > >>> > On Tue, Jul 24, 2012 at 1:38 AM, Mohit Anchlia < > [email protected]> > >>> > wrote: > >>> > > I am trying to drop one of the tables but on the shell I get run > >>> > > major_compact. I have couple of questions: > >>> > > > >>> > > 1. How to see if this table has more than one region? > >>> > > 2. And why do I need to run major compact > >>> > > > >>> > > > >>> > > hbase(main):010:0* drop 'SESSION_TIMELINE' > >>> > > > >>> > > ERROR: Table SESSION_TIMELINE is enabled. Disable it first.' > >>> > > > >>> > > Here is some help for this command: > >>> > > > >>> > > Drop the named table. Table must first be disabled. If table has > >>> > > > >>> > > more than one region, run a major compaction on .META.: > >>> > > > >>> > > hbase> major_compact ".META." > >>> > > >>> >
