HBASE-24492 : Remove infinite loop from ProtobufLogReader#readNext (#1831)
Signed-off-by: Duo Zhang <zhangduo@apache.org>
This commit is contained in:
Viraj Jasani
parent
571ef7e811
commit
b3c6af9500
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@ -329,108 +329,108 @@ public class ProtobufLogReader extends ReaderBase {
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@Override
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protected boolean readNext(Entry entry) throws IOException {
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while (true) {
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// OriginalPosition might be < 0 on local fs; if so, it is useless to us.
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long originalPosition = this.inputStream.getPos();
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if (trailerPresent && originalPosition > 0 && originalPosition == this.walEditsStopOffset) {
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LOG.trace("Reached end of expected edits area at offset {}", originalPosition);
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return false;
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}
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WALKey.Builder builder = WALKey.newBuilder();
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long size = 0;
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boolean resetPosition = false;
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try {
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long available = -1;
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try {
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int firstByte = this.inputStream.read();
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if (firstByte == -1) {
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throw new EOFException();
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}
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size = CodedInputStream.readRawVarint32(firstByte, this.inputStream);
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// available may be < 0 on local fs for instance. If so, can't depend on it.
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available = this.inputStream.available();
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if (available > 0 && available < size) {
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throw new EOFException("Available stream not enough for edit, " +
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"inputStream.available()= " + this.inputStream.available() + ", " +
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"entry size= " + size + " at offset = " + this.inputStream.getPos());
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}
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ProtobufUtil.mergeFrom(builder, ByteStreams.limit(this.inputStream, size),
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(int)size);
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} catch (InvalidProtocolBufferException ipbe) {
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resetPosition = true;
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throw (EOFException) new EOFException("Invalid PB, EOF? Ignoring; originalPosition=" +
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originalPosition + ", currentPosition=" + this.inputStream.getPos() +
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", messageSize=" + size + ", currentAvailable=" + available).initCause(ipbe);
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}
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if (!builder.isInitialized()) {
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// TODO: not clear if we should try to recover from corrupt PB that looks semi-legit.
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// If we can get the KV count, we could, theoretically, try to get next record.
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throw new EOFException("Partial PB while reading WAL, " +
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"probably an unexpected EOF, ignoring. current offset=" + this.inputStream.getPos());
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}
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WALKey walKey = builder.build();
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entry.getKey().readFieldsFromPb(walKey, this.byteStringUncompressor);
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if (!walKey.hasFollowingKvCount() || 0 == walKey.getFollowingKvCount()) {
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LOG.trace("WALKey has no KVs that follow it; trying the next one. current offset={}",
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this.inputStream.getPos());
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seekOnFs(originalPosition);
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return false;
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}
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int expectedCells = walKey.getFollowingKvCount();
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long posBefore = this.inputStream.getPos();
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try {
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int actualCells = entry.getEdit().readFromCells(cellDecoder, expectedCells);
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if (expectedCells != actualCells) {
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resetPosition = true;
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throw new EOFException("Only read " + actualCells); // other info added in catch
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}
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} catch (Exception ex) {
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String posAfterStr = "<unknown>";
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try {
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posAfterStr = this.inputStream.getPos() + "";
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} catch (Throwable t) {
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LOG.trace("Error getting pos for error message - ignoring", t);
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}
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String message = " while reading " + expectedCells + " WAL KVs; started reading at "
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+ posBefore + " and read up to " + posAfterStr;
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IOException realEofEx = extractHiddenEof(ex);
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throw (EOFException) new EOFException("EOF " + message).
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initCause(realEofEx != null ? realEofEx : ex);
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}
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if (trailerPresent && this.inputStream.getPos() > this.walEditsStopOffset) {
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LOG.error("Read WALTrailer while reading WALEdits. wal: " + this.path
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+ ", inputStream.getPos(): " + this.inputStream.getPos() + ", walEditsStopOffset: "
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+ this.walEditsStopOffset);
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throw new EOFException("Read WALTrailer while reading WALEdits");
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}
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} catch (EOFException eof) {
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// If originalPosition is < 0, it is rubbish and we cannot use it (probably local fs)
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if (originalPosition < 0) {
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LOG.warn("Encountered a malformed edit, but can't seek back to last good position "
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+ "because originalPosition is negative. last offset={}",
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this.inputStream.getPos(), eof);
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throw eof;
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}
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// If stuck at the same place and we got and exception, lets go back at the beginning.
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if (inputStream.getPos() == originalPosition) {
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if (resetPosition) {
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LOG.warn("Encountered a malformed edit, seeking to the beginning of the WAL since " +
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"current position and original position match at {}", originalPosition);
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seekOnFs(0);
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} else {
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LOG.debug("Reached the end of file at position {}", originalPosition);
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}
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} else {
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// Else restore our position to original location in hope that next time through we will
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// read successfully.
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LOG.warn("Encountered a malformed edit, seeking back to last good position in file, " +
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"from {} to {}", inputStream.getPos(), originalPosition, eof);
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seekOnFs(originalPosition);
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}
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return false;
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}
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return true;
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// OriginalPosition might be < 0 on local fs; if so, it is useless to us.
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long originalPosition = this.inputStream.getPos();
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if (trailerPresent && originalPosition > 0 && originalPosition == this.walEditsStopOffset) {
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LOG.trace("Reached end of expected edits area at offset {}", originalPosition);
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return false;
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}
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WALKey.Builder builder = WALKey.newBuilder();
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long size = 0;
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boolean resetPosition = false;
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try {
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long available = -1;
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try {
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int firstByte = this.inputStream.read();
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if (firstByte == -1) {
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throw new EOFException();
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}
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size = CodedInputStream.readRawVarint32(firstByte, this.inputStream);
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// available may be < 0 on local fs for instance. If so, can't depend on it.
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available = this.inputStream.available();
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if (available > 0 && available < size) {
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throw new EOFException(
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"Available stream not enough for edit, " + "inputStream.available()= "
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+ this.inputStream.available() + ", " + "entry size= " + size + " at offset = "
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+ this.inputStream.getPos());
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}
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ProtobufUtil.mergeFrom(builder, ByteStreams.limit(this.inputStream, size), (int) size);
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} catch (InvalidProtocolBufferException ipbe) {
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resetPosition = true;
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throw (EOFException) new EOFException(
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"Invalid PB, EOF? Ignoring; originalPosition=" + originalPosition + ", currentPosition="
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+ this.inputStream.getPos() + ", messageSize=" + size + ", currentAvailable="
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+ available).initCause(ipbe);
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}
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if (!builder.isInitialized()) {
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// TODO: not clear if we should try to recover from corrupt PB that looks semi-legit.
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// If we can get the KV count, we could, theoretically, try to get next record.
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throw new EOFException(
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"Partial PB while reading WAL, " + "probably an unexpected EOF, ignoring. current offset="
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+ this.inputStream.getPos());
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}
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WALKey walKey = builder.build();
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entry.getKey().readFieldsFromPb(walKey, this.byteStringUncompressor);
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if (!walKey.hasFollowingKvCount() || 0 == walKey.getFollowingKvCount()) {
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LOG.trace("WALKey has no KVs that follow it; trying the next one. current offset={}",
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this.inputStream.getPos());
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seekOnFs(originalPosition);
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return false;
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}
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int expectedCells = walKey.getFollowingKvCount();
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long posBefore = this.inputStream.getPos();
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try {
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int actualCells = entry.getEdit().readFromCells(cellDecoder, expectedCells);
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if (expectedCells != actualCells) {
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resetPosition = true;
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throw new EOFException("Only read " + actualCells); // other info added in catch
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}
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} catch (Exception ex) {
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String posAfterStr = "<unknown>";
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try {
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posAfterStr = this.inputStream.getPos() + "";
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} catch (Throwable t) {
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LOG.trace("Error getting pos for error message - ignoring", t);
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}
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String message =
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" while reading " + expectedCells + " WAL KVs; started reading at " + posBefore
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+ " and read up to " + posAfterStr;
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IOException realEofEx = extractHiddenEof(ex);
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throw (EOFException) new EOFException("EOF " + message).
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initCause(realEofEx != null ? realEofEx : ex);
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}
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if (trailerPresent && this.inputStream.getPos() > this.walEditsStopOffset) {
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LOG.error(
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"Read WALTrailer while reading WALEdits. wal: " + this.path + ", inputStream.getPos(): "
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+ this.inputStream.getPos() + ", walEditsStopOffset: " + this.walEditsStopOffset);
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throw new EOFException("Read WALTrailer while reading WALEdits");
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}
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} catch (EOFException eof) {
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// If originalPosition is < 0, it is rubbish and we cannot use it (probably local fs)
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if (originalPosition < 0) {
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LOG.warn("Encountered a malformed edit, but can't seek back to last good position "
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+ "because originalPosition is negative. last offset={}", this.inputStream.getPos(), eof);
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throw eof;
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}
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// If stuck at the same place and we got and exception, lets go back at the beginning.
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if (inputStream.getPos() == originalPosition) {
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if (resetPosition) {
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LOG.warn("Encountered a malformed edit, seeking to the beginning of the WAL since "
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+ "current position and original position match at {}", originalPosition);
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seekOnFs(0);
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} else {
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LOG.debug("Reached the end of file at position {}", originalPosition);
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}
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} else {
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// Else restore our position to original location in hope that next time through we will
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// read successfully.
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LOG.warn("Encountered a malformed edit, seeking back to last good position in file, "
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+ "from {} to {}", inputStream.getPos(), originalPosition, eof);
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seekOnFs(originalPosition);
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}
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return false;
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}
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return true;
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}
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private IOException extractHiddenEof(Exception ex) {
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