List of obtainRowLock() Examples

Examples of obtainRowLock()

org.apache.hadoop.hbase.regionserver.HRegion.obtainRowLock()

Obtain a lock on the given row. Blocks until success. I know it's strange to have two mappings:

 ROWS  ==> LOCKS

as well as

 LOCKS ==> ROWS

But it acts as a guard on the client; a miswritten client just can't submit the name of a row and start writing to it; it must know the correct lockid, which matches the lock list in memory.

It would be more memory-efficient to assume a correctly-written client, which maybe we'll do in the future. @param row Name of row to lock. @throws IOException @return The id of the held lock.

    h.load(ObserverB.class, Coprocessor.PRIORITY_USER, conf);
    h.load(ObserverC.class, Coprocessor.PRIORITY_LOWEST, conf);


    Put put = new Put(ROW);
    put.add(A, A, A);
    int lockid = region.obtainRowLock(ROW);
    region.put(put, lockid);
    region.releaseRowLock(lockid);


    Coprocessor c = h.findCoprocessor(ObserverA.class.getName());
    long idA = ((ObserverA)c).id;

    h.load(ObserverB.class, Coprocessor.PRIORITY_USER, conf);
    h.load(ObserverC.class, Coprocessor.PRIORITY_LOWEST, conf);


    Put put = new Put(ROW);
    put.add(A, A, A);
    int lockid = region.obtainRowLock(ROW);
    region.put(put, lockid);
    region.releaseRowLock(lockid);


    Coprocessor c = h.findCoprocessor(ObserverA.class.getName());
    long idA = ((ObserverA)c).id;

    h.load(ObserverB.class, Coprocessor.PRIORITY_USER, conf);
    h.load(ObserverC.class, Coprocessor.PRIORITY_LOWEST, conf);


    Put put = new Put(ROW);
    put.add(A, A, A);
    int lockid = region.obtainRowLock(ROW);
    region.put(put, lockid);
    region.releaseRowLock(lockid);


    Coprocessor c = h.findCoprocessor(ObserverA.class.getName());
    long idA = ((ObserverA)c).id;

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Examples of obtainRowLock()

Examples of org.apache.hadoop.hbase.regionserver.HRegion.obtainRowLock()

Examples of org.apache.hadoop.hbase.regionserver.HRegion.obtainRowLock()

Examples of org.apache.hadoop.hbase.regionserver.HRegion.obtainRowLock()