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Fix bookkeeping, get rid of aborts during recovery of partially flushed log.

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This commit is contained in:
Sears Russell 2008-02-20 22:51:52 +00:00
parent 0fc93d07d3
commit 17d4f95d03
1 changed files with 16 additions and 17 deletions
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33
src/stasis/logger/logWriter.c
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@ -244,8 +244,6 @@ int openLogWriter() {
const LogEntry * le;
nextAvailableLSN = sizeof(lsn_t) + global_offset;
flushedLSN_stable = nextAvailableLSN;
flushedLSN_internal = nextAvailableLSN;
unsigned int crc = 0;
@ -287,6 +285,8 @@ int openLogWriter() {
// Reset log_crc to zero (nextAvailableLSN immediately follows a crc
// entry).
flushedLSN_stable = nextAvailableLSN;
flushedLSN_internal = nextAvailableLSN;
log_crc = 0;
return 0;
@ -391,11 +391,11 @@ static void syncLogInternal() {
pthread_mutex_lock(&nextAvailableLSN_mutex);
newFlushedLSN = nextAvailableLSN;
pthread_mutex_unlock(&nextAvailableLSN_mutex);
fflush(log);
writelock(flushedLSN_lock, 0);
if(newFlushedLSN > flushedLSN_internal) {
pthread_mutex_unlock(&nextAvailableLSN_mutex);
fflush(log);
writelock(flushedLSN_lock, 0);
}
if(newFlushedLSN > flushedLSN_internal) {
flushedLSN_internal = newFlushedLSN;
}
@ -493,12 +493,11 @@ static LogEntry * readLogEntry() {
return (LogEntry*)LLADD_IO_ERROR;
} else {
lsn_t newSize = size - bytesRead;
lsn_t newBytesRead = read (roLogFD, ((byte*)ret)+bytesRead, newSize);
lsn_t newBytesRead = read (roLogFD, ((byte*)&size)+bytesRead, newSize);
fprintf(stdout, "Trying to piece together short read.\n"); fflush(stderr);
if(newBytesRead == 0) {
abort();
return NULL;
}
fprintf(stderr, "short read from log. Expected %lld bytes, got %lld.\nFIXME: This is 'normal', but currently not handled", (long long) sizeof(lsn_t), (long long) bytesRead);
@ -521,8 +520,8 @@ static LogEntry * readLogEntry() {
if(bytesRead == 0) {
fprintf(stderr, "eof reading entry\n");
fflush(stderr);
abort();
// return(NULL);
free(ret);
return(NULL);
} else if(bytesRead == -1) {
perror("error reading log");
abort();
@ -531,13 +530,13 @@ static LogEntry * readLogEntry() {
lsn_t newSize = size - bytesRead;
lsn_t newBytesRead = read (roLogFD, ((byte*)ret)+bytesRead, newSize);
fprintf(stdout, "Trying to piece together short log entry.\n"); fflush(stderr);
if(newBytesRead == 0) {
abort();
if(newBytesRead == 0) {
free(ret);
return NULL;
}
fprintf(stdout, "Trying to piece together short log entry.\n"); fflush(stderr);
fprintf(stderr, "short read from log w/ lsn %lld. Expected %lld bytes, got %lld.\nFIXME: This is 'normal', but currently not handled", debug_lsn, size, bytesRead);
fflush(stderr);
fprintf(stderr, "\nattempt to read again produced newBytesRead = %lld, newSize was %lld\n", newBytesRead, newSize);
@ -548,8 +547,8 @@ static LogEntry * readLogEntry() {
}
}
entrySize = sizeofLogEntry(ret);
assert(size == entrySize);
// entrySize = sizeofLogEntry(ret);
// assert(size == entrySize);
return ret;
}