HBASE-17501 Revert "Revert "guard against NPE while reading FileTrailer and HFileBlock""
This reverts commit 9a4068dcf8caec644e6703ffa365a8649bbd336e. This is a revert of a revert -- i.e. a restore -- just so I can add the JIRA issue to the commit message. Project: http://git-wip-us.apache.org/repos/asf/hbase/repo Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/6fb44f7e Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/6fb44f7e Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/6fb44f7e Branch: refs/heads/hbase-12439 Commit: 6fb44f7eb8ded5496d2348af21a9d5ca0dd39ab4 Parents: 9a4068d Author: Michael Stack <st...@apache.org> Authored: Thu Mar 16 14:54:17 2017 -0700 Committer: Michael Stack <st...@apache.org> Committed: Thu Mar 16 14:54:17 2017 -0700 ---------------------------------------------------------------------- .../hadoop/hbase/io/hfile/FixedFileTrailer.java | 3 +- .../hadoop/hbase/io/hfile/HFileBlock.java | 2 +- .../apache/hadoop/hbase/io/hfile/HFileUtil.java | 43 ++++++++++++++++++++ 3 files changed, 46 insertions(+), 2 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hbase/blob/6fb44f7e/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java ---------------------------------------------------------------------- diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java index 7eac9c6..1854236 100644 --- a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java +++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java @@ -388,7 +388,8 @@ public class FixedFileTrailer { bufferSize = (int) fileSize; } - istream.seek(seekPoint); + HFileUtil.seekOnMultipleSources(istream, seekPoint); + ByteBuffer buf = ByteBuffer.allocate(bufferSize); istream.readFully(buf.array(), buf.arrayOffset(), buf.arrayOffset() + buf.limit()); http://git-wip-us.apache.org/repos/asf/hbase/blob/6fb44f7e/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java ---------------------------------------------------------------------- diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java index fba15ba..0b140b6 100644 --- a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java +++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java @@ -1512,7 +1512,7 @@ public class HFileBlock implements Cacheable { if (!pread && streamLock.tryLock()) { // Seek + read. Better for scanning. try { - istream.seek(fileOffset); + HFileUtil.seekOnMultipleSources(istream, fileOffset); long realOffset = istream.getPos(); if (realOffset != fileOffset) { http://git-wip-us.apache.org/repos/asf/hbase/blob/6fb44f7e/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileUtil.java ---------------------------------------------------------------------- diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileUtil.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileUtil.java new file mode 100644 index 0000000..835450c --- /dev/null +++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileUtil.java @@ -0,0 +1,43 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.hadoop.hbase.io.hfile; + +import java.io.IOException; + +import org.apache.hadoop.fs.FSDataInputStream; + +public class HFileUtil { + + /** guards against NullPointer + * utility which tries to seek on the DFSIS and will try an alternative source + * if the FSDataInputStream throws an NPE HBASE-17501 + * @param istream + * @param offset + * @throws IOException + */ + static public void seekOnMultipleSources(FSDataInputStream istream, long offset) throws IOException { + try { + // attempt to seek inside of current blockReader + istream.seek(offset); + } catch (NullPointerException e) { + // retry the seek on an alternate copy of the data + // this can occur if the blockReader on the DFSInputStream is null + istream.seekToNewSource(offset); + } + } +}