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java.lang.Objectorg.apache.hadoop.hbase.zookeeper.ZooKeeperListener
org.apache.hadoop.hbase.master.SplitLogManager
@InterfaceAudience.Private public class SplitLogManager
Distributes the task of log splitting to the available region servers.
Coordination happens via zookeeper. For every log file that has to be split a
znode is created under /hbase/splitlog
. SplitLogWorkers race to grab a task.
SplitLogManager monitors the task znodes that it creates using the
timeoutMonitor thread. If a task's progress is slow then
resubmit(String, Task, ResubmitDirective)
will take away the task from the owner
SplitLogWorker
and the task will be up for grabs again. When the task is done then the
task's znode is deleted by SplitLogManager.
Clients call splitLogDistributed(Path)
to split a region server's
log files. The caller thread waits in this method until all the log files
have been split.
All the zookeeper calls made by this class are asynchronous. This is mainly to help reduce response time seen by the callers.
There is race in this design between the SplitLogManager and the SplitLogWorker. SplitLogManager might re-queue a task that has in reality already been completed by a SplitLogWorker. We rely on the idempotency of the log splitting task for correctness.
It is also assumed that every log splitting task is unique and once completed (either with success or with error) it will be not be submitted again. If a task is resubmitted then there is a risk that old "delete task" can delete the re-submission.
Nested Class Summary | |
---|---|
static interface |
SplitLogManager.TaskFinisher
SplitLogManager can use objects implementing this interface to
finish off a partially done task by SplitLogWorker . |
Field Summary | |
---|---|
static int |
DEFAULT_MAX_RESUBMIT
|
static int |
DEFAULT_TIMEOUT
|
static int |
DEFAULT_UNASSIGNED_TIMEOUT
|
static int |
DEFAULT_ZK_RETRIES
|
boolean |
ignoreZKDeleteForTesting
|
Fields inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener |
---|
watcher |
Constructor Summary | |
---|---|
SplitLogManager(ZooKeeperWatcher zkw,
org.apache.hadoop.conf.Configuration conf,
Stoppable stopper,
MasterServices master,
ServerName serverName)
Wrapper around SplitLogManager(ZooKeeperWatcher zkw, Configuration conf,
Stoppable stopper, MasterServices master, ServerName serverName, TaskFinisher tf)
that provides a task finisher for copying recovered edits to their final destination. |
|
SplitLogManager(ZooKeeperWatcher zkw,
org.apache.hadoop.conf.Configuration conf,
Stoppable stopper,
MasterServices master,
ServerName serverName,
SplitLogManager.TaskFinisher tf)
Its OK to construct this object even when region-servers are not online. |
Method Summary | |
---|---|
void |
finishInitialization()
Completes the initialization |
void |
finishInitialization(boolean masterRecovery)
|
void |
nodeDataChanged(String path)
Called when an existing node has changed data. |
long |
splitLogDistributed(List<org.apache.hadoop.fs.Path> logDirs)
The caller will block until all the log files of the given region server have been processed - successfully split or an error is encountered - by an available worker region server. |
long |
splitLogDistributed(List<org.apache.hadoop.fs.Path> logDirs,
org.apache.hadoop.fs.PathFilter filter)
The caller will block until all the META log files of the given region server have been processed - successfully split or an error is encountered - by an available worker region server. |
long |
splitLogDistributed(org.apache.hadoop.fs.Path logDir)
|
void |
stop()
|
Methods inherited from class org.apache.hadoop.hbase.zookeeper.ZooKeeperListener |
---|
nodeChildrenChanged, nodeCreated, nodeDeleted |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
public static final int DEFAULT_TIMEOUT
public static final int DEFAULT_ZK_RETRIES
public static final int DEFAULT_MAX_RESUBMIT
public static final int DEFAULT_UNASSIGNED_TIMEOUT
public boolean ignoreZKDeleteForTesting
Constructor Detail |
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public SplitLogManager(ZooKeeperWatcher zkw, org.apache.hadoop.conf.Configuration conf, Stoppable stopper, MasterServices master, ServerName serverName)
SplitLogManager(ZooKeeperWatcher zkw, Configuration conf,
Stoppable stopper, MasterServices master, ServerName serverName, TaskFinisher tf)
that provides a task finisher for copying recovered edits to their final destination.
The task finisher has to be robust because it can be arbitrarily restarted or called
multiple times.
zkw
- conf
- stopper
- serverName
- public SplitLogManager(ZooKeeperWatcher zkw, org.apache.hadoop.conf.Configuration conf, Stoppable stopper, MasterServices master, ServerName serverName, SplitLogManager.TaskFinisher tf)
zkw
- conf
- stopper
- serverName
- tf
- task finisherMethod Detail |
---|
public void finishInitialization(boolean masterRecovery)
public long splitLogDistributed(org.apache.hadoop.fs.Path logDir) throws IOException
logDir
- one region sever hlog dir path in .logs
IOException
- if there was an error while splitting any log file
IOException
public long splitLogDistributed(List<org.apache.hadoop.fs.Path> logDirs) throws IOException
logDirs
- List of log dirs to split
IOException
- If there was an error while splitting any log filepublic long splitLogDistributed(List<org.apache.hadoop.fs.Path> logDirs, org.apache.hadoop.fs.PathFilter filter) throws IOException
logDirs
- List of log dirs to splitfilter
- the Path filter to select specific files for considering
IOException
- If there was an error while splitting any log filepublic void nodeDataChanged(String path)
ZooKeeperListener
nodeDataChanged
in class ZooKeeperListener
path
- full path of the updated nodepublic void stop()
public void finishInitialization()
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