Examples of org.apache.hadoop.hdfs.client.ShortCircuitCache.fetchOrCreate()

Class org.apache.hadoop.hdfs.client.ShortCircuitCache

Examples of org.apache.hadoop.hdfs.client.ShortCircuitCache.fetchOrCreate()

org.apache.hadoop.hdfs.client.ShortCircuitCache.fetchOrCreate()
Fetch or create a replica. You must hold the cache lock while calling this function. @param key Key to use for lookup. @param creator Replica creator callback. Will be called withoutthe cache lock being held. @return Null if no replica could be found or created.The replica, otherwise.


    // Keep trying to getOrCreate block 0 until it goes stale (and we must re-create.)
    GenericTestUtils.waitFor(new Supplier<Boolean>() {
      @Override
      public Boolean get() {
        ShortCircuitReplicaInfo info = cache.fetchOrCreate(
          new ExtendedBlockId(0, "test_bp1"), new ShortCircuitReplicaCreator() {
          @Override
          public ShortCircuitReplicaInfo createShortCircuitReplicaInfo() {
            return null;
          }

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        return true;
      }
    }, 500, 60000);


    // Make sure that second replica did not go stale.
    ShortCircuitReplicaInfo info = cache.fetchOrCreate(
        new ExtendedBlockId(1, "test_bp1"), new ShortCircuitReplicaCreator() {
      @Override
      public ShortCircuitReplicaInfo createShortCircuitReplicaInfo() {
        Assert.fail("second replica went stale, despite 1 " +
            "hour staleness time.");

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