/**
* Delete the specified snapshot
*
* @param snapshot
* @throws SnapshotDoesNotExistException If the specified snapshot does not exist.
* @throws IOException For filesystem IOExceptions
*/
public void deleteSnapshot(SnapshotDescription snapshot)
throws SnapshotDoesNotExistException, IOException {
// check to see if it is completed
if (!isSnapshotCompleted(snapshot)) {
throw new SnapshotDoesNotExistException(ProtobufUtil.createSnapshotDesc(snapshot));
}
String snapshotName = snapshot.getName();
// first create the snapshot description and check to see if it exists
FileSystem fs = master.getMasterFileSystem().getFileSystem();
Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshotName, rootDir);
// Get snapshot info from file system. The one passed as parameter is a "fake" snapshotInfo with
// just the "name" and it does not contains the "real" snapshot information
snapshot = SnapshotDescriptionUtils.readSnapshotInfo(fs, snapshotDir);
// call coproc pre hook
MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
if (cpHost != null) {
cpHost.preDeleteSnapshot(snapshot);
}
LOG.debug("Deleting snapshot: " + snapshotName);
// delete the existing snapshot
if (!fs.delete(snapshotDir, true)) {
throw new HBaseSnapshotException("Failed to delete snapshot directory: " + snapshotDir);
}
// call coproc post hook
if (cpHost != null) {
cpHost.postDeleteSnapshot(snapshot);
}
}
protected void verifyRoundRobinDistribution(HTable ht, int expectedRegions) throws IOException {
MasterServices services = TEST_UTIL.getMiniHBaseCluster().getMaster();
AssignmentManager am = services.getAssignmentManager();
Map<HRegionInfo, HServerAddress> regions = ht.getRegionsInfo();
for (HRegionInfo regionInfo : regions.keySet()) {
try {
am.waitForAssignment(regionInfo);
} catch (InterruptedException e) {
LOG.info("Interrupted waiting for region to be assigned during " + "create table call", e);
Thread.currentThread().interrupt();
return;
}
}
int numRS = ht.getCurrentNrHRS();
regions = ht.getRegionsInfo();
Map<HServerAddress, List<HRegionInfo>> server2Regions =
new HashMap<HServerAddress, List<HRegionInfo>>();
for (Map.Entry<HRegionInfo, HServerAddress> entry : regions.entrySet()) {
HServerAddress server = entry.getValue();
List<HRegionInfo> regs = server2Regions.get(server);
if (regs == null) {
regs = new ArrayList<HRegionInfo>();
server2Regions.put(server, regs);
}
regs.add(entry.getKey());
}
float average = (float) expectedRegions / numRS;
int min = (int) Math.floor(average);
int max = (int) Math.ceil(average);
for (List<HRegionInfo> regionList : server2Regions.values()) {
assertTrue(regionList.size() == min || regionList.size() == max);
}
}
private long getRegionSize(HRegionInfo hri) {
ServerName sn =
masterServices.getAssignmentManager().getRegionStates().getRegionServerOfRegion(hri);
RegionLoad regionLoad =
masterServices.getServerManager().getLoad(sn).getRegionsLoad().get(hri.getRegionName());
return regionLoad.getStorefileSizeMB();
}
/**
* Gets the list of all completed snapshots.
*
* @param snapshotDir snapshot directory
* @return list of SnapshotDescriptions
* @throws IOException File system exception
*/
private List<SnapshotDescription> getCompletedSnapshots(Path snapshotDir) throws IOException {
List<SnapshotDescription> snapshotDescs = new ArrayList<SnapshotDescription>();
// first create the snapshot root path and check to see if it exists
FileSystem fs = master.getMasterFileSystem().getFileSystem();
if (snapshotDir == null) snapshotDir = SnapshotDescriptionUtils.getSnapshotsDir(rootDir);
// if there are no snapshots, return an empty list
if (!fs.exists(snapshotDir)) {
return snapshotDescs;
}
// ignore all the snapshots in progress
FileStatus[] snapshots =
fs.listStatus(
snapshotDir, new SnapshotDescriptionUtils.CompletedSnaphotDirectoriesFilter(fs));
MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
// loop through all the completed snapshots
for (FileStatus snapshot : snapshots) {
Path info = new Path(snapshot.getPath(), SnapshotDescriptionUtils.SNAPSHOTINFO_FILE);
// if the snapshot is bad
if (!fs.exists(info)) {
LOG.error("Snapshot information for " + snapshot.getPath() + " doesn't exist");
continue;
}
FSDataInputStream in = null;
try {
in = fs.open(info);
SnapshotDescription desc = SnapshotDescription.parseFrom(in);
if (cpHost != null) {
try {
cpHost.preListSnapshot(desc);
} catch (AccessDeniedException e) {
LOG.warn(
"Current user does not have access to "
+ desc.getName()
+ " snapshot. "
+ "Either you should be owner of this snapshot or admin user.");
// Skip this and try for next snapshot
continue;
}
}
snapshotDescs.add(desc);
// call coproc post hook
if (cpHost != null) {
cpHost.postListSnapshot(desc);
}
} catch (IOException e) {
LOG.warn("Found a corrupted snapshot " + snapshot.getPath(), e);
} finally {
if (in != null) {
in.close();
}
}
}
return snapshotDescs;
}
/**
* Cleans up any snapshots in the snapshot/.tmp directory that were left from failed snapshot
* attempts.
*
* @throws IOException if we can't reach the filesystem
*/
void resetTempDir() throws IOException {
// cleanup any existing snapshots.
Path tmpdir = SnapshotDescriptionUtils.getWorkingSnapshotDir(rootDir);
if (master.getMasterFileSystem().getFileSystem().exists(tmpdir)) {
if (!master.getMasterFileSystem().getFileSystem().delete(tmpdir, true)) {
LOG.warn("Couldn't delete working snapshot directory: " + tmpdir);
}
}
}
/**
* Fully specify all necessary components of a snapshot manager. Exposed for testing.
*
* @param master services for the master where the manager is running
* @param coordinator procedure coordinator instance. exposed for testing.
* @param pool HBase ExecutorServcie instance, exposed for testing.
*/
public SnapshotManager(
final MasterServices master,
final MetricsMaster metricsMaster,
ProcedureCoordinator coordinator,
ExecutorService pool)
throws IOException, UnsupportedOperationException {
this.master = master;
this.rootDir = master.getMasterFileSystem().getRootDir();
checkSnapshotSupport(master.getConfiguration(), master.getMasterFileSystem());
this.coordinator = coordinator;
this.executorService = pool;
resetTempDir();
}
/**
* Clone the specified snapshot. The clone will fail if the destination table has a snapshot or
* restore in progress.
*
* @param reqSnapshot Snapshot Descriptor from request
* @param tableName table to clone
* @param snapshot Snapshot Descriptor
* @param snapshotTableDesc Table Descriptor
* @param nonceGroup unique value to prevent duplicated RPC
* @param nonce unique value to prevent duplicated RPC
* @return procId the ID of the clone snapshot procedure
* @throws IOException
*/
private long cloneSnapshot(
final SnapshotDescription reqSnapshot,
final TableName tableName,
final SnapshotDescription snapshot,
final HTableDescriptor snapshotTableDesc,
final long nonceGroup,
final long nonce)
throws IOException {
MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
HTableDescriptor htd = new HTableDescriptor(tableName, snapshotTableDesc);
if (cpHost != null) {
cpHost.preCloneSnapshot(reqSnapshot, htd);
}
long procId;
try {
procId = cloneSnapshot(snapshot, htd, nonceGroup, nonce);
} catch (IOException e) {
LOG.error(
"Exception occurred while cloning the snapshot "
+ snapshot.getName()
+ " as table "
+ tableName.getNameAsString(),
e);
throw e;
}
LOG.info("Clone snapshot=" + snapshot.getName() + " as table=" + tableName);
if (cpHost != null) {
cpHost.postCloneSnapshot(reqSnapshot, htd);
}
return procId;
}
/**
* @param snapshot descriptor of the snapshot to take
* @param masterServices master services provider
*/
public TakeSnapshotHandler(SnapshotDescription snapshot, final MasterServices masterServices) {
super(masterServices, EventType.C_M_SNAPSHOT_TABLE);
assert snapshot != null : "SnapshotDescription must not be nul1";
assert masterServices != null : "MasterServices must not be nul1";
this.master = masterServices;
this.snapshot = snapshot;
this.snapshotTable = TableName.valueOf(snapshot.getTable());
this.conf = this.master.getConfiguration();
this.fs = this.master.getMasterFileSystem().getFileSystem();
this.rootDir = this.master.getMasterFileSystem().getRootDir();
this.snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshot, rootDir);
this.workingDir = SnapshotDescriptionUtils.getWorkingSnapshotDir(snapshot, rootDir);
this.monitor = new ForeignExceptionDispatcher(snapshot.getName());
this.snapshotManifest = SnapshotManifest.create(conf, fs, workingDir, snapshot, monitor);
this.tableLockManager = master.getTableLockManager();
this.tableLock =
this.tableLockManager.writeLock(snapshotTable, EventType.C_M_SNAPSHOT_TABLE.toString());
// prepare the verify
this.verifier = new MasterSnapshotVerifier(masterServices, snapshot, rootDir);
// update the running tasks
this.status =
TaskMonitor.get()
.createStatus("Taking " + snapshot.getType() + " snapshot on table: " + snapshotTable);
}
/**
* Modify table is async so wait on completion of the table operation in master.
*
* @param tableName
* @param htd
* @throws IOException
*/
private void modifyTable(final byte[] tableName, final HTableDescriptor htd) throws IOException {
MasterServices services = TEST_UTIL.getMiniHBaseCluster().getMaster();
ExecutorService executor = services.getExecutorService();
AtomicBoolean done = new AtomicBoolean(false);
executor.registerListener(EventType.C_M_MODIFY_TABLE, new DoneListener(done));
this.admin.modifyTable(tableName, htd);
while (!done.get()) {
synchronized (done) {
try {
done.wait(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
executor.unregisterListener(EventType.C_M_MODIFY_TABLE);
}
/**
* Restore the specified snapshot. The restore will fail if the destination table has a snapshot
* or restore in progress.
*
* @param reqSnapshot Snapshot Descriptor from request
* @param tableName table to restore
* @param snapshot Snapshot Descriptor
* @param snapshotTableDesc Table Descriptor
* @param nonceGroup unique value to prevent duplicated RPC
* @param nonce unique value to prevent duplicated RPC
* @return procId the ID of the restore snapshot procedure
* @throws IOException
*/
private long restoreSnapshot(
final SnapshotDescription reqSnapshot,
final TableName tableName,
final SnapshotDescription snapshot,
final HTableDescriptor snapshotTableDesc,
final long nonceGroup,
final long nonce)
throws IOException {
MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
if (master
.getTableStateManager()
.isTableState(TableName.valueOf(snapshot.getTable()), TableState.State.ENABLED)) {
throw new UnsupportedOperationException(
"Table '"
+ TableName.valueOf(snapshot.getTable())
+ "' must be disabled in order to "
+ "perform a restore operation.");
}
// call Coprocessor pre hook
if (cpHost != null) {
cpHost.preRestoreSnapshot(reqSnapshot, snapshotTableDesc);
}
long procId;
try {
procId = restoreSnapshot(snapshot, snapshotTableDesc, nonceGroup, nonce);
} catch (IOException e) {
LOG.error(
"Exception occurred while restoring the snapshot "
+ snapshot.getName()
+ " as table "
+ tableName.getNameAsString(),
e);
throw e;
}
LOG.info("Restore snapshot=" + snapshot.getName() + " as table=" + tableName);
if (cpHost != null) {
cpHost.postRestoreSnapshot(reqSnapshot, snapshotTableDesc);
}
return procId;
}
@Override
public void initialize(MasterServices master, MetricsMaster metricsMaster)
throws KeeperException, IOException, UnsupportedOperationException {
this.master = master;
this.rootDir = master.getMasterFileSystem().getRootDir();
checkSnapshotSupport(master.getConfiguration(), master.getMasterFileSystem());
// get the configuration for the coordinator
Configuration conf = master.getConfiguration();
long wakeFrequency = conf.getInt(SNAPSHOT_WAKE_MILLIS_KEY, SNAPSHOT_WAKE_MILLIS_DEFAULT);
long timeoutMillis =
Math.max(
conf.getLong(
SnapshotDescriptionUtils.SNAPSHOT_TIMEOUT_MILLIS_KEY,
SnapshotDescriptionUtils.SNAPSHOT_TIMEOUT_MILLIS_DEFAULT),
conf.getLong(
SnapshotDescriptionUtils.MASTER_SNAPSHOT_TIMEOUT_MILLIS,
SnapshotDescriptionUtils.DEFAULT_MAX_WAIT_TIME));
int opThreads = conf.getInt(SNAPSHOT_POOL_THREADS_KEY, SNAPSHOT_POOL_THREADS_DEFAULT);
// setup the default procedure coordinator
String name = master.getServerName().toString();
ThreadPoolExecutor tpool = ProcedureCoordinator.defaultPool(name, opThreads);
ProcedureCoordinatorRpcs comms =
new ZKProcedureCoordinatorRpcs(
master.getZooKeeper(), SnapshotManager.ONLINE_SNAPSHOT_CONTROLLER_DESCRIPTION, name);
this.coordinator = new ProcedureCoordinator(comms, tpool, timeoutMillis, wakeFrequency);
this.executorService = master.getExecutorService();
resetTempDir();
}
/**
* Check to see if the snapshot is one of the currently completed snapshots Returns true if the
* snapshot exists in the "completed snapshots folder".
*
* @param snapshot expected snapshot to check
* @return <tt>true</tt> if the snapshot is stored on the {@link FileSystem}, <tt>false</tt> if is
* not stored
* @throws IOException if the filesystem throws an unexpected exception,
* @throws IllegalArgumentException if snapshot name is invalid.
*/
private boolean isSnapshotCompleted(SnapshotDescription snapshot) throws IOException {
try {
final Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshot, rootDir);
FileSystem fs = master.getMasterFileSystem().getFileSystem();
// check to see if the snapshot already exists
return fs.exists(snapshotDir);
} catch (IllegalArgumentException iae) {
throw new UnknownSnapshotException("Unexpected exception thrown", iae);
}
}
/** Remove the procedures that are marked as finished */
private synchronized void cleanupCompletedRestoreInMap() {
ProcedureExecutor<MasterProcedureEnv> procExec = master.getMasterProcedureExecutor();
Iterator<Map.Entry<TableName, Long>> it = restoreTableToProcIdMap.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<TableName, Long> entry = it.next();
Long procId = entry.getValue();
if (procExec.isRunning() && procExec.isFinished(procId)) {
it.remove();
}
}
}
/**
* Restore the specified snapshot. The restore will fail if the destination table has a snapshot
* or restore in progress.
*
* @param snapshot Snapshot Descriptor
* @param hTableDescriptor Table Descriptor
* @param nonceGroup unique value to prevent duplicated RPC
* @param nonce unique value to prevent duplicated RPC
* @return procId the ID of the restore snapshot procedure
*/
private synchronized long restoreSnapshot(
final SnapshotDescription snapshot,
final HTableDescriptor hTableDescriptor,
final long nonceGroup,
final long nonce)
throws HBaseSnapshotException {
TableName tableName = hTableDescriptor.getTableName();
// make sure we aren't running a snapshot on the same table
if (isTakingSnapshot(tableName)) {
throw new RestoreSnapshotException("Snapshot in progress on the restore table=" + tableName);
}
// make sure we aren't running a restore on the same table
if (isRestoringTable(tableName)) {
throw new RestoreSnapshotException("Restore already in progress on the table=" + tableName);
}
try {
long procId =
master
.getMasterProcedureExecutor()
.submitProcedure(
new RestoreSnapshotProcedure(
master.getMasterProcedureExecutor().getEnvironment(),
hTableDescriptor,
snapshot),
nonceGroup,
nonce);
this.restoreTableToProcIdMap.put(tableName, procId);
return procId;
} catch (Exception e) {
String msg =
"Couldn't restore the snapshot="
+ ClientSnapshotDescriptionUtils.toString(snapshot)
+ " on table="
+ tableName;
LOG.error(msg, e);
throw new RestoreSnapshotException(msg, e);
}
}
/**
* Verify if the restore of the specified table is in progress.
*
* @param tableName table under restore
* @return <tt>true</tt> if there is a restore in progress of the specified table.
*/
private synchronized boolean isRestoringTable(final TableName tableName) {
Long procId = this.restoreTableToProcIdMap.get(tableName);
if (procId == null) {
return false;
}
ProcedureExecutor<MasterProcedureEnv> procExec = master.getMasterProcedureExecutor();
if (procExec.isRunning() && !procExec.isFinished(procId)) {
return true;
} else {
this.restoreTableToProcIdMap.remove(tableName);
return false;
}
}
@Override
public void cancel(String why) {
if (finished) return;
this.finished = true;
LOG.info(
"Stop taking snapshot="
+ ClientSnapshotDescriptionUtils.toString(snapshot)
+ " because: "
+ why);
CancellationException ce = new CancellationException(why);
monitor.receive(new ForeignException(master.getServerName().toString(), ce));
}
/**
* Restore or Clone the specified snapshot
*
* @param reqSnapshot
* @param nonceGroup unique value to prevent duplicated RPC
* @param nonce unique value to prevent duplicated RPC
* @throws IOException
*/
public long restoreOrCloneSnapshot(
SnapshotDescription reqSnapshot, final long nonceGroup, final long nonce) throws IOException {
FileSystem fs = master.getMasterFileSystem().getFileSystem();
Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(reqSnapshot, rootDir);
// check if the snapshot exists
if (!fs.exists(snapshotDir)) {
LOG.error("A Snapshot named '" + reqSnapshot.getName() + "' does not exist.");
throw new SnapshotDoesNotExistException(ProtobufUtil.createSnapshotDesc(reqSnapshot));
}
// Get snapshot info from file system. The reqSnapshot is a "fake" snapshotInfo with
// just the snapshot "name" and table name to restore. It does not contains the "real" snapshot
// information.
SnapshotDescription snapshot = SnapshotDescriptionUtils.readSnapshotInfo(fs, snapshotDir);
SnapshotManifest manifest =
SnapshotManifest.open(master.getConfiguration(), fs, snapshotDir, snapshot);
HTableDescriptor snapshotTableDesc = manifest.getTableDescriptor();
TableName tableName = TableName.valueOf(reqSnapshot.getTable());
// stop tracking "abandoned" handlers
cleanupSentinels();
// Verify snapshot validity
SnapshotReferenceUtil.verifySnapshot(master.getConfiguration(), fs, manifest);
// Execute the restore/clone operation
long procId;
if (MetaTableAccessor.tableExists(master.getConnection(), tableName)) {
procId =
restoreSnapshot(reqSnapshot, tableName, snapshot, snapshotTableDesc, nonceGroup, nonce);
} else {
procId =
cloneSnapshot(reqSnapshot, tableName, snapshot, snapshotTableDesc, nonceGroup, nonce);
}
return procId;
}
/**
* Check to make sure that we are OK to run the passed snapshot. Checks to make sure that we
* aren't already running a snapshot or restore on the requested table.
*
* @param snapshot description of the snapshot we want to start
* @throws HBaseSnapshotException if the filesystem could not be prepared to start the snapshot
*/
private synchronized void prepareToTakeSnapshot(SnapshotDescription snapshot)
throws HBaseSnapshotException {
FileSystem fs = master.getMasterFileSystem().getFileSystem();
Path workingDir = SnapshotDescriptionUtils.getWorkingSnapshotDir(snapshot, rootDir);
TableName snapshotTable = TableName.valueOf(snapshot.getTable());
// make sure we aren't already running a snapshot
if (isTakingSnapshot(snapshot)) {
SnapshotSentinel handler = this.snapshotHandlers.get(snapshotTable);
throw new SnapshotCreationException(
"Rejected taking "
+ ClientSnapshotDescriptionUtils.toString(snapshot)
+ " because we are already running another snapshot "
+ (handler != null
? ("on the same table "
+ ClientSnapshotDescriptionUtils.toString(handler.getSnapshot()))
: "with the same name"),
ProtobufUtil.createSnapshotDesc(snapshot));
}
// make sure we aren't running a restore on the same table
if (isRestoringTable(snapshotTable)) {
throw new SnapshotCreationException(
"Rejected taking "
+ ClientSnapshotDescriptionUtils.toString(snapshot)
+ " because we are already have a restore in progress on the same snapshot.");
}
try {
// delete the working directory, since we aren't running the snapshot. Likely leftovers
// from a failed attempt.
fs.delete(workingDir, true);
// recreate the working directory for the snapshot
if (!fs.mkdirs(workingDir)) {
throw new SnapshotCreationException(
"Couldn't create working directory (" + workingDir + ") for snapshot",
ProtobufUtil.createSnapshotDesc(snapshot));
}
} catch (HBaseSnapshotException e) {
throw e;
} catch (IOException e) {
throw new SnapshotCreationException(
"Exception while checking to see if snapshot could be started.",
e,
ProtobufUtil.createSnapshotDesc(snapshot));
}
}
/**
* Computes next most "urgent" normalization action on the table. Action may be either a split, or
* a merge, or no action.
*
* @param table table to normalize
* @param types desired types of NormalizationPlan
* @return normalization plan to execute
*/
@Override
public List<NormalizationPlan> computePlanForTable(TableName table, List<PlanType> types)
throws HBaseIOException {
if (table == null || table.isSystemTable()) {
LOG.debug("Normalization of system table " + table + " isn't allowed");
return null;
}
List<NormalizationPlan> plans = new ArrayList<NormalizationPlan>();
List<HRegionInfo> tableRegions =
masterServices.getAssignmentManager().getRegionStates().getRegionsOfTable(table);
// TODO: should we make min number of regions a config param?
if (tableRegions == null || tableRegions.size() < MIN_REGION_COUNT) {
int nrRegions = tableRegions == null ? 0 : tableRegions.size();
LOG.debug(
"Table "
+ table
+ " has "
+ nrRegions
+ " regions, required min number"
+ " of regions for normalizer to run is "
+ MIN_REGION_COUNT
+ ", not running normalizer");
return null;
}
LOG.debug(
"Computing normalization plan for table: "
+ table
+ ", number of regions: "
+ tableRegions.size());
long totalSizeMb = 0;
for (int i = 0; i < tableRegions.size(); i++) {
HRegionInfo hri = tableRegions.get(i);
long regionSize = getRegionSize(hri);
totalSizeMb += regionSize;
}
double avgRegionSize = totalSizeMb / (double) tableRegions.size();
LOG.debug("Table " + table + ", total aggregated regions size: " + totalSizeMb);
LOG.debug("Table " + table + ", average region size: " + avgRegionSize);
int candidateIdx = 0;
while (candidateIdx < tableRegions.size()) {
HRegionInfo hri = tableRegions.get(candidateIdx);
long regionSize = getRegionSize(hri);
// if the region is > 2 times larger than average, we split it, split
// is more high priority normalization action than merge.
if (types.contains(PlanType.SPLIT) && regionSize > 2 * avgRegionSize) {
LOG.debug(
"Table "
+ table
+ ", large region "
+ hri.getRegionNameAsString()
+ " has size "
+ regionSize
+ ", more than twice avg size, splitting");
plans.add(new SplitNormalizationPlan(hri, null));
} else {
if (candidateIdx == tableRegions.size() - 1) {
break;
}
HRegionInfo hri2 = tableRegions.get(candidateIdx + 1);
long regionSize2 = getRegionSize(hri2);
if (types.contains(PlanType.MERGE) && regionSize + regionSize2 < avgRegionSize) {
LOG.debug(
"Table "
+ table
+ ", small region size: "
+ regionSize
+ " plus its neighbor size: "
+ regionSize2
+ ", less than the avg size "
+ avgRegionSize
+ ", merging them");
plans.add(new MergeNormalizationPlan(hri, hri2));
candidateIdx++;
}
}
candidateIdx++;
}
if (plans.isEmpty()) {
LOG.debug("No normalization needed, regions look good for table: " + table);
return null;
}
Collections.sort(plans, planComparator);
return plans;
}
/**
* Take a snapshot based on the enabled/disabled state of the table.
*
* @param snapshot
* @throws HBaseSnapshotException when a snapshot specific exception occurs.
* @throws IOException when some sort of generic IO exception occurs.
*/
public void takeSnapshot(SnapshotDescription snapshot) throws IOException {
// check to see if we already completed the snapshot
if (isSnapshotCompleted(snapshot)) {
throw new SnapshotExistsException(
"Snapshot '" + snapshot.getName() + "' already stored on the filesystem.",
ProtobufUtil.createSnapshotDesc(snapshot));
}
LOG.debug("No existing snapshot, attempting snapshot...");
// stop tracking "abandoned" handlers
cleanupSentinels();
// check to see if the table exists
HTableDescriptor desc = null;
try {
desc = master.getTableDescriptors().get(TableName.valueOf(snapshot.getTable()));
} catch (FileNotFoundException e) {
String msg = "Table:" + snapshot.getTable() + " info doesn't exist!";
LOG.error(msg);
throw new SnapshotCreationException(msg, e, ProtobufUtil.createSnapshotDesc(snapshot));
} catch (IOException e) {
throw new SnapshotCreationException(
"Error while geting table description for table " + snapshot.getTable(),
e,
ProtobufUtil.createSnapshotDesc(snapshot));
}
if (desc == null) {
throw new SnapshotCreationException(
"Table '" + snapshot.getTable() + "' doesn't exist, can't take snapshot.",
ProtobufUtil.createSnapshotDesc(snapshot));
}
SnapshotDescription.Builder builder = snapshot.toBuilder();
// if not specified, set the snapshot format
if (!snapshot.hasVersion()) {
builder.setVersion(SnapshotDescriptionUtils.SNAPSHOT_LAYOUT_VERSION);
}
User user = RpcServer.getRequestUser();
if (User.isHBaseSecurityEnabled(master.getConfiguration()) && user != null) {
builder.setOwner(user.getShortName());
}
snapshot = builder.build();
// call pre coproc hook
MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
if (cpHost != null) {
cpHost.preSnapshot(snapshot, desc);
}
// if the table is enabled, then have the RS run actually the snapshot work
TableName snapshotTable = TableName.valueOf(snapshot.getTable());
if (master.getTableStateManager().isTableState(snapshotTable, TableState.State.ENABLED)) {
LOG.debug("Table enabled, starting distributed snapshot.");
snapshotEnabledTable(snapshot);
LOG.debug("Started snapshot: " + ClientSnapshotDescriptionUtils.toString(snapshot));
}
// For disabled table, snapshot is created by the master
else if (master.getTableStateManager().isTableState(snapshotTable, TableState.State.DISABLED)) {
LOG.debug("Table is disabled, running snapshot entirely on master.");
snapshotDisabledTable(snapshot);
LOG.debug("Started snapshot: " + ClientSnapshotDescriptionUtils.toString(snapshot));
} else {
LOG.error(
"Can't snapshot table '"
+ snapshot.getTable()
+ "', isn't open or closed, we don't know what to do!");
TablePartiallyOpenException tpoe =
new TablePartiallyOpenException(snapshot.getTable() + " isn't fully open.");
throw new SnapshotCreationException(
"Table is not entirely open or closed", tpoe, ProtobufUtil.createSnapshotDesc(snapshot));
}
// call post coproc hook
if (cpHost != null) {
cpHost.postSnapshot(snapshot, desc);
}
}
