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java.lang.Objectorg.apache.hadoop.hbase.regionserver.ShutdownHook
public class ShutdownHook
Manage regionserver shutdown hooks.
install(Configuration, FileSystem, Stoppable, Thread)
Field Summary | |
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static String |
FS_SHUTDOWN_HOOK_WAIT
Key for a long configuration on how much time to wait on the fs shutdown hook. |
static String |
RUN_SHUTDOWN_HOOK
Key for boolean configuration whose default is true. |
Constructor Summary | |
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ShutdownHook()
|
Method Summary | |
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static void |
install(org.apache.hadoop.conf.Configuration conf,
org.apache.hadoop.fs.FileSystem fs,
Stoppable stop,
Thread threadToJoin)
Install a shutdown hook that calls stop on the passed Stoppable and then thread joins against the passed threadToJoin . |
static void |
main(String[] args)
Main to test basic functionality. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final String RUN_SHUTDOWN_HOOK
public static final String FS_SHUTDOWN_HOOK_WAIT
Constructor Detail |
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public ShutdownHook()
Method Detail |
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public static void install(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.FileSystem fs, Stoppable stop, Thread threadToJoin)
threadToJoin
.
When this thread completes, it then runs the hdfs thread (This install
removes the hdfs shutdown hook keeping a handle on it to run it after
threadToJoin
has stopped).
To suppress all shutdown hook handling -- both the running of the
regionserver hook and of the hdfs hook code -- set
RUN_SHUTDOWN_HOOK
in Configuration
to
false
.
This configuration value is checked when the hook code runs.
conf
- fs
- Instance of Filesystem used by the RegionServerstop
- Installed shutdown hook will call stop against this passed
Stoppable
instance.threadToJoin
- After calling stop on stop
will then
join this thread.public static void main(String[] args) throws IOException
args
-
IOException
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