Examples of org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock()

Package org.apache.hadoop.hbase.io.hfile

Class org.apache.hadoop.hbase.io.hfile.HFileReaderV2

Examples of org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock()

org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock()
Read in a file block. @param dataBlockOffset offset to read. @param onDiskBlockSize size of the block @param cacheBlock @param pread Use positional read instead of seek+read (positional isbetter doing random reads whereas seek+read is better scanning). @param isCompaction is this block being read as part of a compaction @param expectedBlockType the block type we are expecting to read with thisread operation, or null to read whatever block type is available and avoid checking (that might reduce caching efficiency of encoded data blocks) @return Block wrapped in a ByteBuffer. @throws IOException

        if (prevBlock != null) {
          onDiskSize = prevBlock.getNextBlockOnDiskSizeWithHeader();
        }
        // Flags: don't cache the block, use pread, this is not a compaction.
        // Also, pass null for expected block type to avoid checking it.
        HFileBlock block = reader.readBlock(offset, onDiskSize, false, true,
          false, true, null, DataBlockEncoding.NONE);
        BlockCacheKey blockCacheKey = new BlockCacheKey(reader.getName(),
          offset);
        boolean isCached = cache.getBlock(blockCacheKey, true, false, true) != null;
        boolean shouldBeCached = cowType.shouldBeCached(block.getBlockType());

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        if (prevBlock != null) {
          onDiskSize = prevBlock.getNextBlockOnDiskSizeWithHeader();
        }
        // Flags: don't cache the block, use pread, this is not a compaction.
        // Also, pass null for expected block type to avoid checking it.
        HFileBlock block = reader.readBlock(offset, onDiskSize, false, true,
          false);
        BlockCacheKey blockCacheKey = new BlockCacheKey(reader.getName(),
          offset);
        boolean isCached = cache.getBlock(blockCacheKey, true) != null;
        boolean shouldBeCached = cowType.shouldBeCached(block.getBlockType());

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