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java.lang.Objectorg.apache.hadoop.hbase.catalog.CatalogTracker
@InterfaceAudience.Private public class CatalogTracker
Tracks the availability of the catalog tables
.META..
This class is "read-only" in that the locations of the catalog tables cannot
be explicitly set. Instead, ZooKeeper is used to learn of the availability
and location of .META..
Call start() to start up operation. Call stop()} to
interrupt waits and close up shop.
| Constructor Summary | |
|---|---|
CatalogTracker(org.apache.hadoop.conf.Configuration conf)
Constructs a catalog tracker. |
|
CatalogTracker(ZooKeeperWatcher zk,
org.apache.hadoop.conf.Configuration conf,
Abortable abortable)
Constructs the catalog tracker. |
|
CatalogTracker(ZooKeeperWatcher zk,
org.apache.hadoop.conf.Configuration conf,
HConnection connection,
Abortable abortable)
|
|
| Method Summary | |
|---|---|
HConnection |
getConnection()
|
ServerName |
getMetaLocation()
Gets the current location for .META. or null if location is
not currently available. |
boolean |
isMetaLocationAvailable()
Checks whether meta regionserver znode has some non null data. |
void |
start()
Starts the catalog tracker. |
void |
stop()
Stop working. |
boolean |
verifyMetaRegionLocation(long timeout)
Verify .META. is deployed and accessible. |
void |
waitForMeta()
Waits indefinitely for availability of .META.. |
ServerName |
waitForMeta(long timeout)
Gets the current location for .META. if available and waits
for up to the specified timeout if not immediately available. |
AdminProtos.AdminService.BlockingInterface |
waitForMetaServerConnection(long timeout)
Deprecated. Use #getMetaServerConnection(long) |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public CatalogTracker(org.apache.hadoop.conf.Configuration conf)
throws IOException
start() post construction. Does
not timeout.
conf - the Configuration from which a HConnection will be
obtained; if problem, this connections
Abortable.abort(String, Throwable) will be called.
IOException
public CatalogTracker(ZooKeeperWatcher zk,
org.apache.hadoop.conf.Configuration conf,
Abortable abortable)
throws IOException
start() post construction.
Does not timeout.
zk - If zk is null, we'll create an instance (and shut it down
when stop() is called) else we'll use what is passed.conf - abortable - If fatal exception we'll call abort on this. May be null.
If it is we'll use the Connection associated with the passed
Configuration as our Abortable.
IOException
public CatalogTracker(ZooKeeperWatcher zk,
org.apache.hadoop.conf.Configuration conf,
HConnection connection,
Abortable abortable)
throws IOException
IOException| Method Detail |
|---|
public void start()
throws IOException,
InterruptedException
IOException
InterruptedExceptionpublic void stop()
public ServerName getMetaLocation()
throws InterruptedException
.META. or null if location is
not currently available.
ServerName for server hosting .META. or null
if none available
InterruptedExceptionpublic boolean isMetaLocationAvailable()
public ServerName waitForMeta(long timeout)
throws InterruptedException,
NotAllMetaRegionsOnlineException
.META. if available and waits
for up to the specified timeout if not immediately available. Returns null
if the timeout elapses before root is available.
timeout - maximum time to wait for root availability, in milliseconds
ServerName for server hosting .META. or null
if none available
InterruptedException - if interrupted while waiting
NotAllMetaRegionsOnlineException - if meta not available before
timeout
public AdminProtos.AdminService.BlockingInterface waitForMetaServerConnection(long timeout)
throws InterruptedException,
NotAllMetaRegionsOnlineException,
IOException
timeout - How long to wait on meta location
InterruptedException
NotAllMetaRegionsOnlineException - if timed out waiting
IOExceptionfor additional information
public void waitForMeta()
throws InterruptedException
.META.. Used during
cluster startup. Does not verify meta, just that something has been
set up in zk.
InterruptedException - if interrupted while waitingwaitForMeta(long)
public boolean verifyMetaRegionLocation(long timeout)
throws InterruptedException,
IOException
.META. is deployed and accessible.
timeout - How long to wait on zk for meta address (passed through to
the internal call to waitForMetaServerConnection(long).
.META. location is healthy.
IOException
InterruptedExceptionpublic HConnection getConnection()
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