com.bigdata.ha

Interface QuorumRead<S extends HAReadGlue>

All Known Subinterfaces:

QuorumService<S>

All Known Implementing Classes:

QuorumReadImpl, QuorumServiceBase

public interface QuorumRead<S extends HAReadGlue>

A non-remote interface for a member service in a Quorum defining methods to support reading on another member of the quorum.

Version:

$Id$

Author:

Bryan Thompson

Method Summary

Methods

Modifier and Type	Method and Description
byte[]	readFromQuorum(UUID storeId, long addr) Used by any service joined with the quorum to read a record from another service joined with the quorum in order to work around a "bad read" as identified by a checksum error on the local service.

Method Detail

readFromQuorum

byte[] readFromQuorum(UUID storeId,
                    long addr)
                      throws InterruptedException,
                             IOException

Used by any service joined with the quorum to read a record from another service joined with the quorum in order to work around a "bad read" as identified by a checksum error on the local service.

Note: This is NOT the normal path for reading on a record from a service. This is used to handle bad reads (when a checksum or IO error is reported by the local disk) by reading the record from another member of the quorum.

Parameters:

storeId - The UUID of the IRawStore from which the record should be read.

addr - The address of a record on that store.

Returns:

The record.

Throws:

IllegalStateException - if the quorum is not highly available.

RuntimeException - if the quorum is highly available but the record could not be read.

InterruptedException

IOException

See Also:

HAGlue#readFromDisk(UUID, long)