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Fix database does not exists error when is_member(), schema_id() function gets called in parallel query mode. #289

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merged 5 commits into from
Jan 18, 2024
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Fix database does not exists error when is_member(), schema_id() function gets called in parallel query mode. #289

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0385efa
[BABEL-4538] Fix database does not exists error when is_member(), sc…
ahmed-shameem Jan 10, 2024
cdffd62
Modify hooks names
ahmed-shameem Jan 12, 2024
d220647
Address review comments
ahmed-shameem Jan 12, 2024
6888ab2
Address review comments
ahmed-shameem Jan 15, 2024
30feba2
Address review comments
ahmed-shameem Jan 16, 2024
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16 changes: 16 additions & 0 deletions src/backend/access/transam/parallel.c
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Original file line number Diff line number Diff line change
Expand Up @@ -77,6 +77,10 @@
#define PARALLEL_KEY_RELMAPPER_STATE UINT64CONST(0xFFFFFFFFFFFF000D)
#define PARALLEL_KEY_UNCOMMITTEDENUMS UINT64CONST(0xFFFFFFFFFFFF000E)

/* Hooks for communicating babelfish related information to parallel worker */
bbf_InitializeParallelDSM_hook_type bbf_InitializeParallelDSM_hook = NULL;
bbf_ParallelWorkerMain_hook_type bbf_ParallelWorkerMain_hook = NULL;

/* Fixed-size parallel state. */
typedef struct FixedParallelState
{
Expand Down Expand Up @@ -291,6 +295,10 @@ InitializeParallelDSM(ParallelContext *pcxt)
shm_toc_estimate_chunk(&pcxt->estimator, strlen(pcxt->library_name) +
strlen(pcxt->function_name) + 2);
shm_toc_estimate_keys(&pcxt->estimator, 1);

/* Estimate how much we'll need for the babelfish fixed parallel state */
if (MyProcPort->is_tds_conn && bbf_InitializeParallelDSM_hook)
(*bbf_InitializeParallelDSM_hook) (pcxt, true);
}

/*
Expand Down Expand Up @@ -465,6 +473,10 @@ InitializeParallelDSM(ParallelContext *pcxt)
strcpy(entrypointstate, pcxt->library_name);
strcpy(entrypointstate + lnamelen + 1, pcxt->function_name);
shm_toc_insert(pcxt->toc, PARALLEL_KEY_ENTRYPOINT, entrypointstate);

/* Initialize babelfish fixed-size state in shared memory. */
if (MyProcPort->is_tds_conn && bbf_InitializeParallelDSM_hook)
(*bbf_InitializeParallelDSM_hook) (pcxt, false);
}

/* Restore previous memory context. */
Expand Down Expand Up @@ -1483,6 +1495,10 @@ ParallelWorkerMain(Datum main_arg)
false);
RestoreUncommittedEnums(uncommittedenumsspace);

/* Hook for babelfish to restore babelfish fixed parallel state */
if (MyFixedParallelState->babelfish_context && bbf_ParallelWorkerMain_hook)
(*bbf_ParallelWorkerMain_hook) (toc);

/* Attach to the leader's serializable transaction, if SERIALIZABLE. */
AttachSerializableXact(fps->serializable_xact_handle);

Expand Down
11 changes: 11 additions & 0 deletions src/include/access/parallel.h
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Original file line number Diff line number Diff line change
Expand Up @@ -82,4 +82,15 @@ extern void ParallelWorkerMain(Datum main_arg);
/* Below helpers are added to support parallel workers in Babelfish context */
extern bool IsBabelfishParallelWorker(void);

/* Key for BabelfishFixedParallelState */
#define BABELFISH_PARALLEL_KEY_FIXED UINT64CONST(0xBBF0000000000001)

/* Hooks for communicating babelfish related information to parallel worker */
typedef void (*bbf_InitializeParallelDSM_hook_type)(ParallelContext *pcxt, bool estimate);
extern PGDLLIMPORT bbf_InitializeParallelDSM_hook_type bbf_InitializeParallelDSM_hook;

typedef void (*bbf_ParallelWorkerMain_hook_type)(shm_toc *toc);
extern PGDLLIMPORT bbf_ParallelWorkerMain_hook_type bbf_ParallelWorkerMain_hook;


#endif /* PARALLEL_H */
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