public class ExampleMasterObserverWithMetrics extends BaseMasterObserver
These metrics will be available through the regular Hadoop metrics2 sinks (ganglia, opentsdb, etc) as well as JMX output. You can view a snapshot of the metrics by going to the http web UI of the master page, something like http://mymasterhost:16010/jmx
ExampleRegionObserverWithMetrics
Coprocessor.State
PRIORITY_HIGHEST, PRIORITY_LOWEST, PRIORITY_SYSTEM, PRIORITY_USER, VERSION
Constructor and Description |
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ExampleMasterObserverWithMetrics() |
Modifier and Type | Method and Description |
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void |
postCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
HTableDescriptor desc,
HRegionInfo[] regions)
Called after the createTable operation has been requested.
|
void |
preCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
HTableDescriptor desc,
HRegionInfo[] regions)
Called before a new table is created by
HMaster . |
void |
preDisableTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
TableName tableName)
Called prior to disabling a table.
|
void |
start(CoprocessorEnvironment env) |
postAbortProcedure, postAddColumn, postAddColumnHandler, postAddRSGroup, postAssign, postBalance, postBalanceRSGroup, postBalanceSwitch, postClearDeadServers, postCloneSnapshot, postCreateNamespace, postCreateTableHandler, postDeleteColumn, postDeleteColumnHandler, postDeleteNamespace, postDeleteSnapshot, postDeleteTable, postDeleteTableHandler, postDisableTable, postDisableTableHandler, postDispatchMerge, postEnableTable, postEnableTableHandler, postGetClusterStatus, postGetNamespaceDescriptor, postGetTableDescriptors, postGetTableDescriptors, postGetTableNames, postListNamespaceDescriptors, postListProcedures, postListSnapshot, postModifyColumn, postModifyColumnHandler, postModifyNamespace, postModifyTable, postModifyTableHandler, postMove, postMoveServers, postMoveServersAndTables, postMoveTables, postRegionOffline, postRemoveRSGroup, postRemoveServers, postRestoreSnapshot, postSetNamespaceQuota, postSetSplitOrMergeEnabled, postSetTableQuota, postSetUserQuota, postSetUserQuota, postSetUserQuota, postSnapshot, postStartMaster, postTableFlush, postTruncateTable, postTruncateTableHandler, postUnassign, preAbortProcedure, preAddColumn, preAddColumnHandler, preAddRSGroup, preAssign, preBalance, preBalanceRSGroup, preBalanceSwitch, preClearDeadServers, preCloneSnapshot, preCreateNamespace, preCreateTableHandler, preDeleteColumn, preDeleteColumnHandler, preDeleteNamespace, preDeleteSnapshot, preDeleteTable, preDeleteTableHandler, preDisableTableHandler, preDispatchMerge, preEnableTable, preEnableTableHandler, preGetClusterStatus, preGetNamespaceDescriptor, preGetTableDescriptors, preGetTableDescriptors, preGetTableNames, preListNamespaceDescriptors, preListProcedures, preListSnapshot, preMasterInitialization, preModifyColumn, preModifyColumnHandler, preModifyNamespace, preModifyTable, preModifyTableHandler, preMove, preMoveServers, preMoveServersAndTables, preMoveTables, preRegionOffline, preRemoveRSGroup, preRemoveServers, preRestoreSnapshot, preSetNamespaceQuota, preSetSplitOrMergeEnabled, preSetTableQuota, preSetUserQuota, preSetUserQuota, preSetUserQuota, preShutdown, preSnapshot, preStopMaster, preTableFlush, preTruncateTable, preTruncateTableHandler, preUnassign, stop
public void preCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx, HTableDescriptor desc, HRegionInfo[] regions) throws IOException
MasterObserver
HMaster
. Called as part of create
table RPC call.
It can't bypass the default action, e.g., ctx.bypass() won't have effect.preCreateTable
in interface MasterObserver
preCreateTable
in class BaseMasterObserver
ctx
- the environment to interact with the framework and masterdesc
- the HTableDescriptor for the tableregions
- the initial regions created for the tableIOException
public void postCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx, HTableDescriptor desc, HRegionInfo[] regions) throws IOException
MasterObserver
postCreateTable
in interface MasterObserver
postCreateTable
in class BaseMasterObserver
ctx
- the environment to interact with the framework and masterdesc
- the HTableDescriptor for the tableregions
- the initial regions created for the tableIOException
public void preDisableTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName) throws IOException
MasterObserver
preDisableTable
in interface MasterObserver
preDisableTable
in class BaseMasterObserver
ctx
- the environment to interact with the framework and mastertableName
- the name of the tableIOException
public void start(CoprocessorEnvironment env) throws IOException
start
in interface Coprocessor
start
in class BaseMasterObserver
IOException
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