Class ChaoticLoadBalancer
- java.lang.Object
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- org.apache.accumulo.server.master.balancer.TabletBalancer
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- org.apache.accumulo.server.master.balancer.ChaoticLoadBalancer
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public class ChaoticLoadBalancer extends TabletBalancer
A chaotic load balancer used for testing. It constantly shuffles tablets, preventing them from resting in a single location for very long. This is not designed for performance, do not use on production systems. I'm calling it the LokiLoadBalancer.Will balance randomly, maintaining distribution
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.accumulo.server.master.balancer.TabletBalancer
TabletBalancer.BalancerProblem, TabletBalancer.NoTservers, TabletBalancer.OutstandingMigrations
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Field Summary
Fields Modifier and Type Field Description protected TabletBalancer.OutstandingMigrations
outstandingMigrations
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Fields inherited from class org.apache.accumulo.server.master.balancer.TabletBalancer
configuration, context, TIME_BETWEEN_BALANCER_WARNINGS
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Constructor Summary
Constructors Constructor Description ChaoticLoadBalancer()
ChaoticLoadBalancer(String tableName)
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Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description long
balance(SortedMap<TServerInstance,TabletServerStatus> current, Set<KeyExtent> migrations, List<TabletMigration> migrationsOut)
Ask the balancer if any migrations are necessary.void
getAssignments(SortedMap<TServerInstance,TabletServerStatus> current, Map<KeyExtent,TServerInstance> unassigned, Map<KeyExtent,TServerInstance> assignments)
Assign tablets to tablet servers.void
init(ServerConfiguration conf)
Deprecated.-
Methods inherited from class org.apache.accumulo.server.master.balancer.TabletBalancer
checkMigrationSanity, constraintNotMet, getOnlineTabletsForTable, init, resetBalancerErrors
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Field Detail
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outstandingMigrations
protected final TabletBalancer.OutstandingMigrations outstandingMigrations
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Constructor Detail
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ChaoticLoadBalancer
public ChaoticLoadBalancer()
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ChaoticLoadBalancer
public ChaoticLoadBalancer(String tableName)
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Method Detail
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getAssignments
public void getAssignments(SortedMap<TServerInstance,TabletServerStatus> current, Map<KeyExtent,TServerInstance> unassigned, Map<KeyExtent,TServerInstance> assignments)
Description copied from class:TabletBalancer
Assign tablets to tablet servers. This method is called whenever the master finds tablets that are unassigned.- Specified by:
getAssignments
in classTabletBalancer
- Parameters:
current
- The current table-summary state of all the online tablet servers. Read-only. The TabletServerStatus for each server may be null if the tablet server has not yet responded to a recent request for status.unassigned
- A map from unassigned tablet to the last known tablet server. Read-only.assignments
- A map from tablet to assigned server. Write-only.
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balance
public long balance(SortedMap<TServerInstance,TabletServerStatus> current, Set<KeyExtent> migrations, List<TabletMigration> migrationsOut)
Description copied from class:TabletBalancer
Ask the balancer if any migrations are necessary. If the balancer is going to self-abort due to some environmental constraint (e.g. it requires some minimum number of tservers, or a maximum number of outstanding migrations), it should issue a log message to alert operators. The message should be at WARN normally and at ERROR if the balancer knows that the problem can not self correct. It should not issue these messages more than once a minute.- Specified by:
balance
in classTabletBalancer
- Parameters:
current
- The current table-summary state of all the online tablet servers. Read-only.migrations
- the current set of migrations. Read-only.migrationsOut
- new migrations to perform; should not contain tablets in the current set of migrations. Write-only.- Returns:
- the time, in milliseconds, to wait before re-balancing. This method will not be called when there are unassigned tablets.
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init
@Deprecated public void init(ServerConfiguration conf)
Deprecated.- Overrides:
init
in classTabletBalancer
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